A5089699972- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Photorefractive and Nonlinear Optics
- Advanced Fiber Laser Technologies
- Terahertz technology and applications
- Topological Materials and Phenomena
- Antenna Design and Analysis
- Strong Light-Matter Interactions
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
Nankai University
2022-2024
Shanghai Normal University
2019-2020
Abstract The linear electro-optic effect offers a valuable means to control light properties via an external electric field. Lithium niobate (LN), with its high coefficients and broad optical transparency ranges, stands out as prominent material for efficient modulators. recent advent of lithium niobate-on-insulator (LNOI) wafers has sparked renewed interest in LN compact photonic devices. In this study, we present modulator utilizing thin film sandwiched between top bottom gold (Au)...
Ultracompact devices for second harmonic generation (SHG) have broad applications in various fields. In this study, we numerically demonstrate efficient SHG from a merged bound state the continuum (BIC) based on lithium niobate (LN) freestanding metasurface. Such BIC efficiently reduces radiative loss and strongly enhances quality factor (Q factor). We achieved 1% conversion efficiency under ${5}^{\ensuremath{\circ}}$ incident angle with 2 $\mathrm{kW}/{\mathrm{cm}}^{2}$ input intensity,...
Abstract This study presents photonic vertical cavities consisting of nonlinear materials embedded in crystals (PhCs) for resonantly enhancing second harmonic generation (SHG). Previous attempts at SHG such structures have been limited to efficiencies 10 −7 −5 , but a high efficiency 0.28% by constructing cavity with lithium niobate membrane placed between two PhCs is demonstrated, which exhibits high‐quality resonances. The results open up new possibilities compact laser frequency...
Metamaterials have been engineered to achieve electromagnetically induced transparency (EIT)-like behavior, analogous those in quantum optical systems. These meta-devices are opening new paradigms terahertz communication, ultra-sensitive sensing and EIT-like anti-reflection. The controlled coupling between a sub-radiant super-radiant particle the unit cells of these metamaterial can enable multiple narrow plasmon (PIT) windows over broad band, with considerable group delay electromagnetic...
Electrically reconfigurable nonlinear metasurfaces provide dynamic control over phenomena such as second-harmonic generation (SHG), unlocking novel applications in signal processing, light switching, and sensing. Previous methods, like electric-field-induced SHG plasmonic Stark-tuned nonlinearities quantum well metasurfaces, face limitations due to weak responses from metals mid-infrared constraints of wells, respectively. Addressing the need for efficient visible near-infrared ranges, we...
This work numerically investigates a localized terahertz (THz) slow light phenomenon by tuning the spoof surface plasmon-induced transparency (PIT). A binary meta-molecule supports interaction of plasmon (spoof-LSP), which is composed metallic arc and textured circular cavity periodic grooves. By central angle θ from 90 degrees to 170 degrees, plateau found in window at certain frequency range. maximum 46 ps group delay achieved 135. The numerical mapping electromagnetic field indicates...
Electro-optically (EO) tunable metasurfaces have received considerable attention owing to their capability for dynamic light field control. Here, we report an EO lithium niobate metasurface mediated by topological corner states. Such a supercell of is constructed two kinds finite-sized arrays possessing different properties via the generalized two-dimensional (2D) Su–Schrieffer–Heeger model. The generated narrow-linewidth resonance with high-quality factor and strong localization are very...
Achieving high-quality (Q)-factor resonances in metasurfaces is essential for various applications, including nano-lasers, nonlinear optics, and quantum optics. In this work, we propose a high-Q metasurface using topological strategy: constructing the by stacking two conjugated nanopillar arrays with different invariants. Our study shows that edge state steadily appears at interfaces of nanopillars, sharp transmission resonance Q-factor more than 1000 can be obtained. The sensing application...
Abstract Flexible wavelength tunability is a critical specification for second‐harmonic generation (SHG) light sources. In the evolving landscape of future technologies, photonic crystal (PhC) vertical cavity emerges as promising platform developing ultracompact SHG devices. However, reduced size PhC cavities necessitates departure from conventional tuning methodologies rooted in traditional phase‐matching frameworks. this study, an strategy presented that exploits relationship between...
This work theoretically proposed dual terahertz (THz) slow light plateaus by tuning the destructive interference between a toroidal magnetic momentum and dipole momentum. The metasurfaces are in sandwich structure. A metallic cut-wire is patterned on one side of polyimide thin-film, rectangular split-ring resonator (SRR) other with asymmetric layout. By translating SRR along from top terminal to bottom cut-wire, found transparency window at certain range displacement. maximum 40.4 ps group...
A novel phenomenon is observed in the meta-atoms composed of a complementary rectangular double split-ring resonator (SRR). An intrinsic Fano-resonance collapses with outer SRR deformed asymmetrically. Alternatively, trapped mode emerges at an adjacent frequency region, which its strength grows up increasing asymmetric deviation. However, deformation inner has influence neither on evolution this nor excitation aforementioned mode. The results electromagnetic field simulation indicate that...
Tunable nonlinearity facilitates the creation of reconfigurable nonlinear metasurfaces, enabling innovative applications in signal processing, light switching, and sensing. This paper presents a novel approach to electrically modulate SHG from lithium niobate (LN) metasurface, exploiting electro-optical (EO) effect. By fabricating nanohole array metasurface on thin LN film applying an electric field, we demonstrate alteration material's refractive index, resulting resonance shifts modulation...
We present a study on photonic vertical cavities consisting of nonlinear materials embedded in crystals (PhCs) for resonantly enhancing second harmonic generation (SHG). Previous attempts at SHG such structures have been limited to efficiencies 10$^{-7}$ 10$^{-5}$, but we demonstrate here high efficiency 0.28% by constructing cavity with lithium niobate membrane placed between two PhCs, which exhibits quality resonances. Our results open up new possibilities compact laser frequency...
Low quality (Q) factors of the intrinsic inductive–capacitive (LC) mode as well parasitic dipole oscillation restrict high-resolution sensing using split-ring resonators (SRR). Although trapped Fano-mode high-Q factor is found in asymmetric SRR, conventional design limits scaling down resonators. As such, excitation and manipulation multiple modes SRR significant for driving innovative designs terahertz metamaterials metasurfaces. In this work, we present a novel approach to manipulating by...