128 citations · 369 across the 19 of their papers we have counts for
19 papers
High-Q Resonances Governed by the Quasi-Bound States in the Continuum in All-Dielectric Metasurfaces
C. Fang, Q. Yang, Q. Yuan +6
The realization of high-Q resonances in a silicon metasurface with various broken-symmetry blocks is reported. Theoretical analysis reveals that the sharp resonances in the metasur…
Fano resonance from a one-dimensional topological photonic crystal
Linpeng Gu, Binbin Wang, Qingchen Yuan +4
An ultra-compact one-dimensional topological photonic crystal (1D-TPC) is designed in a single mode silicon bus-waveguide to generate Fano resonance lineshape. The Fano resonance c…
Ultralow Threshold, Single-Mode InGaAs/GaAs Multi-Quantum Disk Nanowire Lasers
Xutao Zhang, Ruixuan Yi, Nikita Gagrani +12
We present single-mode nanowire (NW) lasers with ultralow threshold in the near-infrared spectral range. To ensure the single-mode operation, the NW diameter and length are reduced…
Giant Enhancement of Nonlinear Harmonic Generation in a Silicon Topological Photonic Crystal Nanocavity Chain
Qingchen Yuan, Linpeng Gu, Liang Fang +3
Strongly enhanced third-harmonic generation (THG) by the topological localization of an edge mode in a Su-Schrieffer-Heeger (SSH) chain of silicon photonic crystal nanocavities is…
A topological photonic ring-resonator for on-chip channel filters
Linpeng Gu, Qingchen Yuan, Qiang Zhao +5
A topologically protected ring-resonator formed in valley photonic crystals is proposed and fabricated on a silicon slab. The unidirectional transmission and robustness against str…
Hybrid vector beams with non-uniform orbital angular momentum density induced by designed azimuthal polarization gradient
Lei Han, Shuxia Qi, Sheng Liu +3
Based on angular amplitude modulation of orthogonal base vectors in common-path interference method, we propose an interesting type of hybrid vector beams with unprecedented azimut…
Optically active beams: non-reciprocal optical activity in free space induced by spin-orbital interaction of light
Sheng Liu, Shuxia Qi, Peng Li +9
Optical activity, the power of a medium to rotate the polarization of a light beam, has contributed significantly to molecular structure assessments in stereochemistry, biomolecula…
Fano resonance lineshapes in a waveguide-microring structure enabled by an air-hole
Linpeng Gu, Liang Fang, Hanlin Fang +5
We propose and demonstrate, by simply inserting an air-hole in the waveguide side-coupling with a microring resonator (MRR), the transmission spectrum presents Fano lineshapes at a…
Second harmonic and sum-frequency generations from a silicon metasurface integrated with a two-dimensional material
Qingchen Yuan, Liang Fang, Hanlin Fang +5
Silicon-based nonlinear metasurfaces were implemented only with third-order nonlinearity due to the crystal centrosymmetry and the efficiencies are considerably low, which hinders…
A compact structure for realizing Lorentzian, Fano and EIT resonance lineshapes in a microring resonator
Linpeng Gu, Hanlin Fang, Juntao Li +4
Microring resonators, as a fundamental building block of photonic integrated circuits, have been well developed into numerous functional devices, whose performances are strongly de…
Valley vortex states and degeneracy lifting via photonic higher-band excitation
Daohong Song, Daniel Leykam, Jing Su +7
We demonstrate valley-dependent vortex generation in a photonic graphene. Without breaking the inversion symmetry, excitation of two equivalent valleys leads to formation of an opt…
Multiple optical frequency-conversions in few-layer GaSe assisted by a photonic crystal cavity
Liang Fang, Qingchen Yuan, Hanlin Fang +6
While two-dimensional (2D) materials have intriguing second-order nonlinearities with ultrahigh coefficient and electrical tunability, their atomic layer thicknesses hinder explora…
Low-power continuous-wave second harmonic generation in semiconductor nanowires
Qingchen Yuan, Liang Fang, He Yang +5
Semiconductor nanowires (NWs) are promising for realizing various on-chip nonlinear optical devices, due to their nanoscale lateral confinement and strong light-matter interaction.…
Extraordinary second harmonic generation in ReS2 atomic crystals
Yu Song, Siqi Hu, Miao-Ling Lin +3
We report the observations of unexpected layer-dependent, strong, and anisotropic second harmonic generations (SHGs) in atomically thin ReS2. Appreciable (negligible) SHGs are obta…
Second harmonic generation in atomically thin MoTe2
Yu Song, Ruijuan Tian, Jiulong Yang +3
We have studied on optical second harmonic generations (SHGs) from atomically thin MoTe2 flakes with 2H and 1T' phases. From 2H-MoTe2 samples with odd (even) numbers of layers, str…
Cylindrical vector resonant modes achieved in planar photonic crystal cavities with enlarged air-holes
Kang Chang, Liang Fang, Chenyang Zhao +2
We reveal a triangular-lattice planar photonic crystal supports Bloch modes with radially and azimuthally symmetric electric field distributions at the top band-edge of the first p…
High performance graphene oxide-based humidity sensor integrated on a photonic crystal cavity
Xuetao Gan, Chenyang Zhao, Qingchen Yuan +5
We report a high performance relative humidity (RH) microsensor by coating a few-layer graphene oxide (GO) flake over a photonic crystal (PC) cavity. Since the GO layer has a high…
Generation of vector beams in planar photonic crystal cavities with multiple missing-hole defects
Chenyang Zhao, Xuetao Gan, Sheng Liu +2
We propose a novel method to generate vector beams in planar photonic crystal cavities with multiple missing-hole defects. Simulating the resonant modes in the cavities, we observe…
Beam steering and topological transformations driven by interactions between discrete vortex and fundamental solitons
Xuetao Gan, Peng Zhang, Sheng Liu +2
We study coherent and incoherent interactions between discrete vortex and fundamental solitons in two-dimensional photonic lattices, presenting a new scheme for all-optical routing…