Nanoscale Plasmonic Slot Waveguides for Enhanced Raman Spectroscopy
arXiv:1806.06109 · doi:10.1103/PhysRevB.98.085124
Abstract
We theoretically investigate several types of plasmonic slot waveguides for enhancing the measured signal in Raman spectroscopy, which is a consequence of electric field and Purcell factor enhancements, as well as an increase in light-matter interaction volume and the Raman signal collection efficiency. An intuitive methodology is presented for calculating the accumulated Raman enhancement factor of an ensemble of molecules in waveguide sensing, which exploits an analytical photon Green function expansion in terms of the waveguide normal modes, and we combine this with a quantum optics formalism of the molecule-waveguide interaction to model Raman scattering. We subsequently show how integrated plasmonic slot waveguides can attain significantly higher Raman enhancement factors: 5.3 compared to optofluidic fibers and 3.7 compared to planar integrated dielectric waveguides, with a device size and thus analyte volume of at least three-orders of magnitude less. We also provide a comprehensive comparison between the different types of plasmonic slot waveguides based on the important figures-of-merit, and determine the optimal approaches to maximize Raman enhancement.
arXiv comment24 pages, 21 figures
References in corpus (28)
- A single-photon transistor using nano-scale surface plasmons
- Fundamental Limit of Nanophotonic Light-trapping in Solar Cells
- Hyperbolic metamaterials: fundamentals and applications
- Broadband Purcell effect: Radiative decay engineering with metamaterials
- Engineering the Photonic Density of States with metamaterials
- Strong Off-Resonant Enhancement of Spontaneous Emission in Metal-Dielectric-Metal Plasmon Waveguide Structures
- Coupling of individual quantum emitters to channel plasmons
- Gap and channelled plasmons in tapered grooves: a review
- Finite element modeling of spontaneous emission of a quantum emitter at nanoscale proximity to plasmonic waveguides
- Ultrahigh Purcell factors and Lamb shifts using slow-light metamaterial waveguides
- Quasinormal mode approach to modelling light-emission and propagation in nanoplasmonics
- Enhanced and directional single photon emission in hyperbolic metamaterials
- Purcell effect in Hyperbolic Metamaterial Resonators
- Optical Field Enhancement in Nanoscale Slot Waveguides of Hyperbolic Metamaterials
- Electromagnetic energy in a dispersive metamaterial
- Long-Range Dipole-Dipole Interaction and Anomalous Förster Energy Transfer across Hyperbolic Meta Material
- Plasmonic waveguides cladded by hyperbolic metamaterials
- Long-Range Plasmon Assisted Energy Transfer Between Fluorescent Emitters
- Plasmonic waveguides with hyperbolic multilayer cladding
- Quantum Optics Model of Surface Enhanced Raman Spectroscopy for Arbitrarily Shaped Plasmonic Resonators
- Performance Enhancement of Nanoscale Modulators Using Hybrid Plasmonics
- Giant Transverse Optical Forces in Nanoscale Slot Waveguides of Hyperbolic Metamaterials
- Spontaneous Emission Control in a Tunable Hybrid Photonic System
- Single mode waveguide platform for spontaneous and surface-enhanced on-chip Raman spectroscopy
- Long-range plasmon-assisted energy transfer over doped graphene
- Highly Sensitive Wavelength-scale Amorphous Hybrid Plasmonic Detectors
- Hyperbolic Metamaterial Nano-Resonators Make Poor Single Photon Sources
- Theory of hyperbolic stratified nanostructures for surface enhanced Raman scattering