Near-unity coupling efficiency of a quantum emitter to a photonic-crystal waveguide

Abstract

A quantum emitter efficiently coupled to a nanophotonic waveguide constitutes a promising system for the realization of single-photon transistors, quantum-logic gates based on giant single-photon nonlinearities, and high bit-rate deterministic single-photon sources. The key figure of merit for such devices is the $\beta$-factor, which is the probability for an emitted single photon to be channeled into a desired waveguide mode. We report on the experimental achievement of $\beta =98.43\pm 0.04\%$ for a quantum dot coupled to a photonic-crystal waveguide, corresponding to a single-emitter cooperativity of $\eta =62.7\pm 1.5$. This constitutes a nearly ideal photon-matter interface where the quantum dot acts effectively as a 1D "artificial" atom, since it interacts almost exclusively with just a single propagating optical mode. The $\beta$-factor is found to be remarkably robust to variations in position and emission wavelength of the quantum dots. Our work demonstrates the extraordinary potential of photonic-crystal waveguides for highly efficient single-photon generation and on-chip photon-photon interaction.

References in corpus (31)

• Interfacing single photons and single quantum dots with photonic nanostructures
• Measurement of conditional phase shifts for quantum logic
• Theory of Photon Blockade by an Optical Cavity with One Trapped Atom
• A single-photon transistor using nano-scale surface plasmons
• Optical interface created by laser-cooled atoms trapped in the evanescent field surrounding an optical nanofiber
• A Diamond Nanowire Single Photon Antenna
• On-demand semiconductor single-photon source with near-unity indistinguishability
• Nanophotonic quantum phase switch with a single atom
• Ultrafast all-optical switching by single photons
• All-Optical Switch and Transistor Gated by One Stored Photon
• Cavity Quantum Electrodynamics with Anderson-localized Modes
• Experimental realization of highly-efficient broadband coupling of single quantum dots to a photonic crystal waveguide
• A planar dielectric antenna for directional single-photon emission and near-unity collection efficiency
• Sub-Natural Linewidth Single Photons from a Quantum Dot
• Electric-field-induced coherent coupling of the exciton states in a single quantum dot
• Ultrafast photon-photon interaction in a strongly coupled quantum dot-cavity system
• A quantum logic gate between a solid-state quantum bit and a photon
• A Waveguide-Coupled On-Chip Single Photon Source
• Enhanced single-photon emission from a quantum dot in a micropost microcavity
• Finite element modeling of spontaneous emission of a quantum emitter at nanoscale proximity to plasmonic waveguides
• Robust quantum dot state preparation via adiabatic passage with frequency-swept optical pulses
• Sub-microsecond correlations in photoluminescence from InAs quantum dots
• On-chip time resolved detection of quantum dot emission using integrated superconducting single photon detectors
• Mapping the local density of optical states of a photonic crystal with single quantum dots
• Exciton spin-flip rate in quantum dots determined by a modified local density of optical states
• An entangling quantum-logic gate operated with an ultrabright single photon-source
• Enhanced spontaneous emission from quantum dots in short photonic crystal waveguides
• Controlling Anderson localization in disordered photonic crystal waveguides
• Extraction of the beta-factor for single quantum dots coupled to a photonic crystal waveguide
• Measuring the effective phonon density of states of a quantum dot
• Realizing quantum controlled phase-flip gate through quantum dot in silicon slow-light photonic crystal waveguide

Cited by in corpus (283)

• Chiral Quantum Optics
• Interfacing single photons and single quantum dots with photonic nanostructures
• Integrated Photonic Quantum Technologies
• Microwave photonics with superconducting quantum circuits
• Deterministic photon-emitter coupling in chiral photonic circuits
• A bright and fast source of coherent single photons
• Quantum repeaters: From quantum networks to the quantum internet
• Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime
• Strongly interacting photons in one-dimensional continuum
• A solid-state entangled photon pair source with high brightness and indistinguishability
• Decoherence-free interaction between giant atoms in waveguide QED
• Generation of heralded entanglement between distant hole spins
• Cooperative resonances in light scattering from two-dimensional atomic arrays
• Scalable integrated single-photon source
• Single-photon nonlinear optics with a quantum dot in a waveguide
• Hybrid integration methods for on-chip quantum photonics
• Coherent control of single electrons: a review of current progress
• Generation and sampling of quantum states of light in a silicon chip
• Integrated quantum photonics with silicon carbide: challenges and prospects
• Atom-field dressed states in slow-light waveguide QED
• Near-ideal spontaneous photon sources in silicon quantum photonics
• Phonon limit to simultaneous near-unity efficiency and indistinguishability in semiconductor single photon sources
• Quantum dots for photonic quantum information technology
• Highly indistinguishable on-demand resonance fluorescence photons from a deterministic quantum dot micropillar device with 75 $\%$ extraction efficiency
• One-way quantum repeater based on near-deterministic photon-emitter interfaces
• Chiral topological photonics with an embedded quantum emitter
• Collective super- and subradiant dynamics between distant optical quantum emitters
• Two-photon interference from a bright single photon source at telecom wavelengths
• Antenna-cavity hybrids: matching polar opposites for Purcell enhancements at any linewidth
• Quantum networks with chiral light--matter interaction in waveguides
• Deterministic generation of arbitrary photonic states assisted by dissipation
• Waveguide QED: Power Spectra and Correlations of Two Photons Scattered Off Multiple Distant Qubits and a Mirror
• Indistinguishable and efficient single photons from a quantum dot in a planar nanobeam waveguide
• Bound states in boson impurity models
• Dynamics of many-body photon bound states in chiral waveguide QED
• On-Chip Chiral Single-Photon Interface: Isolation and Unidirectional Emission
• Universal Quantum Computation in Waveguide QED using Decoherence Free Subspaces
• Super-radiant emission from quantum dots in a nanophotonic waveguide
• Quantifying the robustness of topological slow light
• Multi-qubit entanglement in bi-directional chiral waveguide QED
• Transfer-printed single photon sources coupled to wire waveguides
• Spin-photon interface and spin-controlled photon switching in a nanobeam waveguide
• Deterministic generation of all-photonic quantum repeaters from solid-state emitters
• Nonreciprocal and chiral single-photon scattering for giant atoms
• A high-fidelity photon gun: intensity-squeezed light from a single molecule
• Reducing phonon-induced decoherence in solid-state single-photon sources with cavity quantum electrodynamics
• Deterministic integration of quantum dots into on-chip multi-mode interference beamsplitters using in-situ electron beam lithography
• Strongly correlated photon transport in waveguide QED with weakly coupled emitters
• Reliable multiphoton generation in waveguide QED
• High-Q slow light and its localization in a photonic crystal microring
• Efficient Extraction of Light from a Nitrogen-Vacancy Center in a Diamond Parabolic Reflector
• Enhancing quantum cryptography with quantum dot single-photon sources
• Design and Analysis of Communication Protocols for Quantum Repeater Networks
• On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source
• Quantum memory and gates using a Lambda-type quantum emitter coupled to a chiral waveguide
• Generation of maximally-entangled long-lived states with giant atoms in a waveguide
• Advances in silicon quantum photonics
• Dynamical signatures of bound states in waveguide QED
• Topological quantum optics using atom-like emitter arrays coupled to photonic crystals
• Experimental demonstration of topological slow light waveguides in valley photonic crystals
• Single-photon superradiance from a quantum dot
• Efficient Source of Shaped Single Photons Based on an Integrated Diamond Nanophotonic System
• Engineering chiral light--matter interaction in photonic crystal waveguides with slow light
• Coherent nonlinear optics of quantum emitters in nanophotonic waveguides
• Direct photonic coupling of a semiconductor quantum dot and a trapped ion
• Quantum optics with near lifetime-limited quantum-dot transitions in a nanophotonic waveguide
• Dynamical photon-photon interaction mediated by a quantum emitter
• Two-photon entanglement in multi-qubit bi-directional waveguide QED
• Device-independent quantum key distribution with single-photon sources
• Oscillating bound states in non-Markovian photonic lattices
• Purcell enhanced and indistinguishable single-photon generation from quantum dots coupled to on-chip integrated ring resonators
• Phonon Decoherence of Quantum Dots in Photonic Structures: Broadening of the Zero-Phonon Line and the Role of Dimensionality
• Photon Sorting, Efficient Bell Measurements and a Deterministic CZ Gate using a Passive Two-level Nonlinearity
• Highly nonlocal optical nonlinearities in atoms trapped near a waveguide
• Experimental reconstruction of the few-photon nonlinear scattering matrix from a single quantum dot in a nanophotonic waveguide
• Quantum optics with giant atoms -- the first five years
• Entangling a Hole Spin with a Time-Bin Photon: A Waveguide Approach for Quantum Dot Sources of Multi-Photon Entanglement
• Multi-Wave Coherent Control of a Solid State Single Emitter
• Monolithic integration of single photon sources via evanescent coupling of tapered InP nanowires to SiN waveguides
• Observation of large spontaneous emission rate enhancement of quantum dots in a broken-symmetry slow-light waveguide
• Simulating quantum light propagation through atomic ensembles using matrix product states
• Ultrastrong coupling few-photon scattering theory
• Chiral quantum optics with V-level atoms and coherent quantum feedback
• Near-unity indistinguishability single photon source for large-scale integrated quantum optics
• Topology-Enhanced Nonreciprocal Scattering and Photon Absorption in a Waveguide
• High-Efficiency Shallow-Etched Grating on GaAs Membranes for Quantum Photonic Applications
• High-fidelity multi-photon-entangled cluster state with solid-state quantum emitters in photonic nanostructures
• Towards fully integrated photonic displacement sensors
• 99% beta factor and directional coupling of quantum dots to fast light in photonic crystal waveguides determined by hyperspectral imaging
• Scattering of two photons on a quantum emitter in a one-dimensional waveguide: Exact dynamics and induced correlations
• Rabi oscillation in a quantum cavity: Markovian and non-Markovian dynamics
• Strongly correlated states of light in chiral chains of three-level quantum emitters
• Tunable photon statistics exploiting the Fano effect in a waveguide
• Two-photon interference from independent cavity-coupled emitters on-a-chip
• Photon transport mediated by an atomic chain trapped along a photonic crystal waveguide
• Quantum photonics hybrid integration platform
• A coherent spin-photon interface with waveguide induced cycling transitions
• Deterministic positioning of nanophotonic waveguides around single self-assembled quantum dots
• Pronounced non-Markovian features in multiply-excited, multiple-emitter waveguide-QED: Retardation-induced anomalous population trappin
• Theory of microwave single-photon detection using an impedance-matched $\Lambda$ system
• Photonic graph state generation from quantum dots and color centers for quantum communications
• Modal Coupling of Single Photon Emitters Within Nanofiber Waveguides
• Open quantum system description of singlet-triplet qubits in quantum dots
• Open quantum system description of singlet-triplet qubits in quantum dots
• Full two-photon downconversion of just a single photon
• Excitons in InGaAs Quantum Dots without Electron Wetting Layer States
• Two-photon interference from a quantum dot--microcavity: Persistent pure-dephasing and suppression of time-jitter
• Deterministic photon source of genuine three-qubit entanglement
• Optical-nanofiber-based interface for single molecules
• Deterministic Photon Sorting in Waveguide QED Systems
• Coherent coupling of single molecules to on-chip ring resonators
• Resource-efficient analyzer of Bell and Greenberger-Horne-Zeilinger states of multiphoton systems
• Quantum routing of single optical photons with a superconducting flux qubit
• Coherent characterisation of a single molecule in a photonic black box
• Numerical modelling of the coupling efficiency of single quantum emitters in photonic-crystal waveguides
• Physics of quantum light emitters in disordered photonic nanostructures
• Full-quantum light diode
• Quantum acousto-optic control of light-matter interactions in nanophotonic networks
• Nonperturbative Waveguide Quantum Electrodynamics
• Acceleration and adiabatic expansion of multi-state fluorescence from a nanofocus
• Electrical control of nonlinear quantum optics in a nano-photonic waveguide
• Deterministic Single-Phonon Source Triggered by a Single Photon
• Deterministic generation of bright single resonance fluorescence photons from a Purcell-enhanced quantum dot-micropillar system
• Fidelity of time-bin entangled multi-photon states from a quantum emitter
• Efficient deterministic giant photon phase shift from a single charged quantum dot
• Rectification of light in the quantum regime
• Path-dependent initialization of a single quantum dot exciton spin in a nano-photonic waveguide
• Microtoroidal resonators enhance long-distance dynamical entanglement generation in chiral quantum networks
• Long-distance dissipation-assisted transport of entangled states via a chiral waveguide
• Bound and Subradiant Multi-Atom Excitations in an Atomic Array with Nonreciprocal Couplings
• Multiphoton pulses interacting with multiple emitters in a one-dimensional waveguide
• Waveguide QED with Quadratic Light-Matter Interactions
• Two mechanisms of disorder-induced localization in photonic-crystal waveguides
• Engineering strong chiral light-matter interactions in a waveguide-coupled nanocavity
• An on-chip architecture for self-homodyned nonclassical light
• Electro-optic routing of photons from single quantum dots in photonic integrated circuits
• Cavity-Quantum Electrodynamics with Moiré Flatband Photonic Crystals
• Performance analysis of quantum repeaters enabled by deterministically generated photonic graph states
• Efficient demultiplexed single-photon source with a quantum dot coupled to a nanophotonic waveguide
• Near unity Raman $\beta$-factor of surface enhanced Raman scattering in a waveguide
• Inverse design of broadband and lossless topological photonic crystal waveguide modes
• Self-Ordering of Individual Photons in Waveguide QED and Rydberg-Atom Arrays
• Hybrid quantum photonics based on artificial atoms placed inside one hole of a photonic crystal cavity
• Coherent optical control of a quantum-dot spin-qubit in a waveguide-based spin-photon interface
• Subradiance dynamics in a singly-excited chiral-coupled atomic chain
• Microwave transmission through an artificial atomic chain coupled to a superconducting photonic crystal
• Statistical measurements of quantum emitters coupled to Anderson-localized modes in disordered photonic-crystal waveguides
• Directional emission of a deterministically fabricated quantum dot - Bragg reflection multi-mode waveguide system
• One- and Two-Photon Scattering by Two Atoms in a Waveguide
• Unraveling the mesoscopic character of quantum dots in nanophotonics
• Emergence of solitons from many-body photon bound states in quantum nonlinear media
• Control of spontaneous emission of a single quantum emitter through a time-modulated photonic-band-gap environment
• Steady-state Phase Diagram of a Weakly Driven Chiral-coupled Atomic Chain
• Information processing at the speed of light
• Independent electrical control of two quantum dots coupled through a photonic-crystal waveguide
• Optimised photonic crystal waveguide for chiral light-matter interactions
• Assessing the alignment accuracy of state-of-the-art deterministic fabrication methods for single quantum dot devices
• Multiphoton Scattering Tomography with Coherent States
• Passive quantum phase gate for photons based on three level emitters
• On-chip spin-photon entanglement based on single-photon scattering
• Optimal Coherent Filtering for Single Noisy Photons
• Violation of Bell inequality by photon scattering on a two-level emitter
• Reciprocity approach for calculating the Purcell effect for emission into an open optical system
• Two photons on an atomic beam-splitter: nonlinear scattering and induced correlations
• Disorder-assisted excitation localization in chirally coupled quantum emitters
• Chiral Light--Matter Interaction Beyond the Rotating-Wave Approximation
• Mesa-top quantum dot single photon emitter arrays: growth, optical characteristics, and the simulated optical response of integrated dielectric nanoantenna-waveguide systems
• Quantum correlations of localized atomic excitations in a disordered atomic chain
• Optical properties of a waveguide-mediated chain of randomly positioned atoms
• Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides
• Violation of Bell's inequality with quantum-dot single-photon sources
• Sub-radiant states for imperfect quantum emitters coupled by a nanophotonic waveguide
• Systematic design of a robust half-W1 photonic crystal waveguide for interfacing slow light and trapped cold atoms
• A hybrid single quantum dot coupled cavity on a CMOS-compatible SiC photonic chip for Purcell-enhanced deterministic single-photon emission
• Strong non-linearity-induced correlations for counter-propagating photons scattering on a two-level emitter
• Simple, robust and on-demand generation of single and correlated photons
• The Truncated Metallo-dielectric Omnidirectional Reflector: Collecting Single Photons in the Fundamental Gaussian Mode with 95% Efficiency
• Self-organization of atoms coupled to a chiral reservoir
• Electric-Field Programmable Spin Arrays for Scalable Quantum Repeaters
• Enhancing quantum transduction via long-range waveguide mediated interactions between quantum emitters
• Proof-of-work consensus by quantum sampling
• Optimizing the chiral Purcell factor for unidirectional single photon emitters in topological photonic crystal waveguides using inverse design
• Cavity-waveguide interplay in lossy resonators and its role in optimal single-photon sources
• Implementing structural slow light on short length scales: the photonic speed-bump
• Waveguide-QED-based measurement of a reservoir spectral density
• Highly pure single photon emission from spectrally uniform surface-curvature directed mesa top single quantum dot ordered array
• Time reversal constraint limits unidirectional photon emission in slow-light photonic crystals
• Atomic-scale on-demand photon polarization manipulation with high-efficiency for integrated photonic chips
• Few-photon Transport in Fano-resonance waveguide geometries
• Realisation of a Coherent and Efficient One-Dimensional Atom
• Quantum Optics in Maxwell's Fish Eye Lens with Single Atoms and Photons
• Generation of single and two-mode multiphoton states in waveguide QED
• Creation of non-classical states of light in a chiral waveguide
• Loss-tolerant architecture for quantum computing with quantum emitters
• All-optical radiofrequency modulation of Anderson-localized modes
• Small slot waveguide rings for on-chip quantum optical circuits
• Reshaping the Jaynes-Cummings ladder with Majorana bound states
• Passive, deterministic photonic CPHASE gate via two-level systems
• The coherence of quantum dot confined electron- and hole-spin in low external magnetic field
• Heralded quantum repeater based on the scattering of photons off single emitters in weak-coupling regime
• Large-bandwidth transduction between an optical single quantum-dot molecule and a superconducting resonator
• In-plane resonant excitation of quantum dots in a dual-mode photonic-crystal waveguide with high $\beta$-factor
• Modular architectures to deterministically generate graph states
• Generation of optical Fock and W states with single-atom-based bright quantum scissors
• Numerical Investigation of Light Emission from Quantum Dots Embedded into On-Chip, Low Index Contrast Optical Waveguides
• Optically Loaded Semiconductor Quantum Memory Register
• Diagrammatic Approach to Scattering of Multi-Photon States in Waveguide QED
• Criteria for single photon sources with variable nonclassicality threshold
• Strong quantum correlations of light emitted by a single atom in free space
• Tunable photon scattering by an atom dimer coupled to a band edge of a photonic crystal waveguide
• Functional Renormalization Group Approach to Circuit Quantum Electrodynamics
• Silicon Carbide photonic platform based on suspended subwavelength waveguides
• Highly nonclassical phonon emission statistics through two-phonon loss of van der Pol oscillator
• Superior dark-state cooling via nonreciprocal couplings in trapped atoms
• Boosting quantum battery performance by structure engineering
• Preparation of a single-photon dark state in a chiral quantum system
• Detecting Photon-Photon Interactions in a Superconducting Circuit
• Protocol for generating multi-photon entangled states from quantum dots in the presence of nuclear spin fluctuations
• Delay-induced spontaneous dark state generation from two distant excited atoms
• Active reset of a radiative cascade for superequilibrium entangled photon generation
• Fourier finite element modeling of light emission in waveguides: 2.5-dimensional FEM approach
• Atomic excitation trapping in dissimilar chirally-coupled atomic arrays
• Correlated Dephasing Noise in Single-photon Scattering
• Suspended Spot-Size Converters for Scalable Single-Photon Devices
• Nanophotonic control of circular dipole emission: toward a scalable solid-state to flying-qubits interface
• Design and fabrication of ridge waveguide-based nanobeam cavities for on-chip single-photon sources
• Strong Superradiance of Coherently Coupled Magnetic Dipole Emitters Mediated by Whispering Gallery Modes of a Subwavelength All-Dielectric Cavity
• Photon-mediated entanglement scheme between a ZnO semiconductor defect and a trapped Yb ion
• Dissipative stabilization of maximal entanglement between non-identical emitters via two-photon excitation
• Performance of the nanopost single-photon source: beyond the single-mode model
• Luminescence thermometry based on photon emitters in nanophotonic silicon waveguides
• Casimir forces in transmission-line circuits: QED and fluctuation-dissipation formalisms
• Towards compact high-efficiency grating couplers for visible wavelength photonics
• Chiral-coupling-assisted refrigeration in trapped ions
• The atomic damping basis and the collective decay of interacting two-level atoms
• Frequency-resolved Purcell effect for the dissipative generation of steady-state entanglement
• Semiconductor-based electron flying qubits: Review on recent progress accelerated by numerical modelling
• Near-unity efficiency in ridge waveguide-based, on-chip single-photon sources
• Tunable ultrahigh reflection with broadband via collective atom-atom interaction in waveguide-QED system
• On-chip nanomechanical filtering of quantum-dot single-photon sources
• Direct detection of quantum non-Gaussian light from a dispersively coupled single atom
• Optical precursors in waveguide quantum electrodynamics
• State Carving in a Chirally-Coupled Atom-Nanophotonic Cavity
• Quantum dots as optimized chiral emitters for photonic integrated circuits
• Controlling single-photon scattering in a rectangular waveguide by a V-type three-level emitter
• Many-Body Entanglement in Solid-State Emitters
• Coherent control of a solid-state quantum bit with few-photon pulses
• Controlling coherence between waveguide-coupled quantum dots
• Suppression of Quantum Correlations in a Clean-Disordered Atom-Nanophotonic Interface
• Dynamic Stark shift induced by a single photon packet
• Definition of Polaritonic Fluctuations in Natural Hyperbolic Media: Applications to Hexagonal Boron Nitride, Bismuth Selenide and the Spontaneous Emission Sum Rule
• Reconfigurable quantum photonic circuits based on quantum dots
• Phase super-resolution with N00N states generated by on demand single-photon sources
• Interplay between external driving, dissipation and collective effects in the Markovian and non-Markovian regimes
• Controllable Single Photon Scattering via Coupling of Driven $\Lambda$ System with Topological Waveguide
• Unidirectional exceptional point of reflectionless states in a magnonic mirror array
• Controlling Excitation Localization in Waveguide QED Systems
• Ultrabright room-temperature single-photon emission from nanodiamond nitrogen-vacancy centers with sub-nanosecond excited-state lifetime
• Multifunctional Control of On-chip Generated Photons by a Single Collective Mode in Monolithically Integrated All-Dielectric Scalable Optical Circuits
• Non-Markovian spontaneous emission in a tunable cavity formed by atomic mirrors
• Lifetimes and quantum efficiencies of quantum dots deterministically positioned in photonic-crystal waveguides
• Manipulation of Multipartite Entanglement in an Array of Quantum Dots
• Fast and High Excitation Transport in Waveguide Quantum Electrodynamics
• Optimal quantum spectroscopy using single-photon pulses
• Strongly Confined Atomic Excitation Localization in a Weakly-Driven Atom-Waveguide Interface
• Optical Spin Sorting Chain
• Excitation transfer and many-body dark states in waveguide quantum electrodynamics
• Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots
• Integration of hBN quantum emitters in monolithically fabricated waveguides
• Near-unity efficiency and photon indistinguishability for the "hourglass" single-photon source using suppression of background emission
• Waveguide QED toolboxes for universal quantum matter
• Long-range quantum emitter interactions mediated by a non-local metasurface: Application to qubit-qubit entanglement
• Elliptical rotation of cavity amplitude in ultrastrong waveguide QED
• Coupling hBN quantum emitters to 1D photonic crystal cavities
• Routing single photons with quantum emitters coupled to nanostructures
• Mechanisms and Opportunities for Tunable High-Purity Single Photon Emitters: A Review of Hybrid Perovskites and Prospects for Bright Squeezed Vacuum
• Quantum state transfer between a frequency-encoded photonic qubit and a quantum dot spin in a nanophotonic waveguide
• On-Chip Scalable Coupled Single Photon Emitter- All Dielectric Multifunctional Quantum Optical Circuits Working on a Single Collective Mie Resonance
• Interaction between atoms and slow light: a waveguide-design study
• Manipulating Excitation Dynamics in Structured Waveguide Quantum Electrodynamics
• Controlling spontaneous emission via electronic correlations in transparent metals
• Topological quantum electrodynamics in synthetic non-Abelian gauge fields
• Controllable Spin-Resolved Photon Emission Enhanced by Slow-Light Mode in Photonic Crystal Waveguides on Chip