A5006649836- Photonic and Optical Devices
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Mechanical and Optical Resonators
- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
- Optical Coatings and Gratings
- Metamaterials and Metasurfaces Applications
- Optical Network Technologies
- Advanced Antenna and Metasurface Technologies
- Microwave Engineering and Waveguides
- Antenna Design and Analysis
- Advanced Photonic Communication Systems
- Fern and Epiphyte Biology
- Millimeter-Wave Propagation and Modeling
- Neural Networks and Reservoir Computing
- Semiconductor Lasers and Optical Devices
- Magnetic Field Sensors Techniques
- Cancer Treatment and Pharmacology
- Orbital Angular Momentum in Optics
- Magneto-Optical Properties and Applications
- Copper-based nanomaterials and applications
- Nonlinear Dynamics and Pattern Formation
- Terahertz technology and applications
- Solid State Laser Technologies
Beijing University of Posts and Telecommunications
2016-2025
State Key Laboratory of Information Photonics and Optical Communications
2011-2024
Tibet University
2022-2023
State Key Laboratory on Integrated Optoelectronics
2011-2017
Harvard University
2013-2014
University of Pittsburgh
2007
We experimentally demonstrate a label-free sensor based on nanoslotted parallel quadrabeam photonic crystal cavity (NPQC). The NPQC possesses both high sensitivity and Q-factor. achieved (S) of 451 nm/refractive index unit Q-factor >7000 in water at telecom wavelength range, featuring figure merit >2000, an order magnitude improvement over the previous sensors. In addition, we measured streptavidin-biotin binding affinity detected 10 ag/mL concentrated streptavidin phosphate...
All-dielectric metamaterials have emerged as a promising platform for low-loss and highly efficient terahertz devices. However, existing fabrication methods difficulty in achieving good balance between precision cost. Here, inspired by the nano-template-assisted self-assembly method, we develop micro-template-assisted (MTAS) method to prepare large-scale, high-precision, flexible ceramic microsphere all-dielectric with an area exceeding 900 cm×900 cm. Free from organic solvents, vacuum,...
Abstract Optical microcavities have become an attractive platform for precision measurement with merits of ultrahigh sensitivity, miniature footprint and fast response. Despite the achievements ultrasensitive detection, optical still face significant challenges in biochemical physical processes complex dynamics, especially when multiple effects are present. Here we demonstrate operando monitoring transition dynamics a phase-change material via self-referencing optofluidic microcavity. We use...
We present nanoscale photonic crystal sensor arrays (NPhCSAs) on monolithic substrates. The NPhCSAs can be used as an opto-fluidic architecture for performing highly parallel, label-free detection of biochemical interactions in aqueous environments. consists lattice-shifted resonant cavities side-coupled to a single PhC waveguide. Each cavity has slightly different spacing and is shown independently shift its peak (a narrow drop) response the changes refractive index. extinction ratio...
We propose a novel optical sensor based on one-dimensional (1D) photonic crystal (PhC) single nanobeam air-mode cavity (SNAC). The performance of the device is investigated theoretically. By introducing quadratically modulated width tapering structure, waveguide-coupled 1D-PhC SNAC with calculated high quality factor 5.16×10(6) and an effective mode volume V(eff)∼2.18(λ/n(si))(3) can be achieved. For air mentioned above, light field strongly localized inside region (low index) overlaps...
Programmable vanadium dioxide (VO2) metasurface is proposed at THz frequencies. The insulating and metallic states of VO2 can be switched via external electrical stimulation, resulting in the dynamical modulation electromagnetic response. voltages different columns controlled by field-programmable gate array, thus phase gradients are realized for beam steering. In 1-bit coding, we design periodic nonperiodic 24 × coding sequences, achieve wide-angle scanning with deflection angles from −60°...
Whispering gallery mode (WGM) microcavities provide increasing opportunities for precision measurement due to their ultrahigh sensitivity, compact size, and fast response. However, the conventional WGM sensors rely on monitoring changes of a single mode, abundant sensing information in transmission spectra has not been fully utilized. Here, empowered by machine learning (ML), we propose demonstrate an ergodic method optofluidic microcavity high-precision pressure measurement. The developed...
We propose and numerically demonstrate the existence of bound state in continuum (BIC) silicon-based one-dimensional photonic crystal nanobeam (1D-PCN). The 1D-PCN is formed by introducing rectangular air nanoholes a simple 1D waveguide. By engineering structure parameters, an ideal BIC with infinite quality (Q) factor demonstrated 1D-PCN. On this basis, we further investigate refractive index sensing performance quasi-BIC defects into aforementioned structure, ultrahigh Q ∼ 4.1 × 107...
Abstract Branched flows occur ubiquitously in various wave systems, when the propagating waves encounter weak correlated scattering potentials. Here we report experimental realization of electrical tuning branched flow light using a nematic liquid crystal (NLC) system. We create physical weakly disordered potentials via inhomogeneous orientations NLC. demonstrate that can be switched on and off as well tuned continuously through electro-optical properties NLC film. further show manipulated...
The ability to sense dynamic biochemical reactions and material processes is particularly crucial for a wide range of applications, such as early-stage disease diagnosis biomedicine development. Optical microcavities-based label-free biosensors are renowned ultrahigh sensitivities, the detection limit has reached single nanoparticle/molecule level. In particular, microbubble resonator combined with an quality factor ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"...
Sensitivities (S) and quality factors (Q) have been trade-offs in label-free optical resonator sensors, optimal geometry that maximizes both is under active development. In this paper, we demonstrate the nanoslotted parallel multibeam cavity possesses unexplored high S Q. We achieve S>800 nm/RIU (refractive index unit) Q>107 liquid at telecom wavelength range when absorption neglected. To best of our knowledge, first features Q factors, thus potentially an ideal platform for refractive...
Abstract A tunable high-order sideband spectra generation scheme is presented by using a photonic molecule optomechanical system coupled to waveguide beyond the perturbation regime. The coherently driven two-tone laser consisting of continuous-wave control field and pulsed driving which propagates through waveguide. frequency spectral feature output analyzed via numerical simulations, we confirm that under condition intense nanosecond pulse driving, spectrum exhibits properties spectra. In...
Optical trapping techniques are of great interest since they have the advantage enabling direct handling nanoparticles. Among various optical systems, photonic crystal nanobeam cavities attracted attention for integrated on-chip and manipulation. However, with high efficiency low input power is still a big challenge in because most light energy confined within solid dielectric region. To this end, by incorporating nanoslotted structure into an ultracompact one-dimensional cavity structure,...
We present a novel optical sensor based on the design of ultrahigh-Q and low-mode-volume 1-D single photonic crystal (PhC) slot nanobeam cavity (SNC) in which air-hole radius is parabolically tapered. The performance device investigated theoretically. In order to achieve high Q-factor sensitivity simultaneously, geometry exploited make field strongly localized inside low index region overlaps sufficiently with analytes. With three-dimensional finite-difference time-domain (3D-FDTD) method,...
We propose a novel multiplexed ultra-compact high-sensitivity one-dimensional (1D) photonic crystal (PC) nanobeam cavity sensor array on monolithic silicon chip, referred to as Parallel Integrated 1D PC Nanobeam Cavity Sensor Array (PI-1DPC-NCSA). The performance of the device is investigated numerically with three-dimensional finite-difference time-domain (3D-FDTD) technique. PI-1DPC-NCSA consists multiple parallel-connected channels integrated cavities/waveguides gap separations. On each...
We theoretically investigate a flexible design of building nanoscale photonic crystal (PhC) integrated sensor array with low crosstalk. The proposed device consists side-coupled PhC resonant cavities high Q-factors over 2 ×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . extinction ratio well-defined single resonance exceeds 30 dB. Each cavity has different wavelengths and independently shifts its in response to the refractive index...
Abstract Phase and defect engineering of the heterostructured MoS 2 @TiO nanoporous film is investigated to achieve a broad solar spectrum light absorption high water splitting efficiency. The phase transition from semiconducting 2H‐MoS metallic 1T‐MoS achieved by hydrothermal exfoliation treatment. Experimental studies elucidate that activity greatly improved forming along with increasing S‐vacancies because significantly enhanced surface plasmon resonance. mixed‐phase shows H yield rate...
Abstract Integrated circuit (IC) industry has fully considered the fact that Moore’s Law is slowing down or ending. Alternative solutions are highly and urgently desired to break physical size limits in More-than-Moore era. silicon photonics technology exhibits distinguished potential achieve faster operation speed, less power dissipation, lower cost IC industry, because their COMS compatibility, fast response, high monolithic integration capability. Particularly, compared with other on-chip...
Innovative techniques play important roles in photonic structure design and complex optical data analysis. As a branch of machine learning, deep learning can automatically reveal the inherent connections behind by using hierarchically structured layers, which has found broad applications photonics. In this paper, we review recent advances for analysis, is based on two major paradigms supervised unsupervised learning. addition, neural networks with high parallelism low energy consuming are...