A5100359124- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Photonic Crystal and Fiber Optics
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Optical Coherence Tomography Applications
- Photonic Crystals and Applications
- Orbital Angular Momentum in Optics
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Neural Networks and Reservoir Computing
- Analytical Chemistry and Sensors
- Railway Engineering and Dynamics
- Advanced Sensor and Energy Harvesting Materials
- Pulsars and Gravitational Waves Research
- Laser Material Processing Techniques
- Random lasers and scattering media
- Plasmonic and Surface Plasmon Research
- Cyclone Separators and Fluid Dynamics
- Quantum Information and Cryptography
- Spectroscopy and Laser Applications
- Advanced Optical Sensing Technologies
Peking University
2018-2024
Collaborative Innovation Center of Advanced Microstructures
2011-2024
Nanjing University of Aeronautics and Astronautics
2011-2024
Nanjing University
2013-2024
Ghent University
2024
China National Offshore Oil Corporation (China)
2024
Zhejiang University
2005-2022
Tianjin Fire Research Institute
2022
Zhejiang University of Technology
2022
Shanghai University
2021
High-energy photons from the Crab Nebula The contains a pulsar that excites surrounding gas to emit high-energy radiation. combination of pulsar's youth and nearby location makes nebula brightest gamma-ray source in sky. LHAASO Collaboration report observations this at energies tera– peta–electron volts, extending spectrum prototypical object. They combine these data with lower model physics emission process. multiwave-length can be explained by synchrotron radiation inverse Compton...
Some gamma-ray bursts (GRBs) have a tera-electron volt (TeV) afterglow, but the early onset of this has not been observed. We report observations with Large High Altitude Air Shower Observatory (LHAASO) bright GRB 221009A, which serendipitously occurred within instrument's field view. More than 64,000 photons >0.2 TeV were detected first 3000 seconds. The flux began several minutes after trigger and then rose to peak ~10 seconds later. This was followed by decay phase, became more rapid ~650...
We present the current state of art in micro-transfer printing for heterogeneously integrated silicon photonic circuits. The versatility technology is highlighted, as way ahead to make this a key enabler next-generation systems-on-chip.
Abstract Smart wearable devices have made remarkable success in medical‐grade human vital signal monitoring and promoted the realization of precision medicine telemedicine. The flexibility stretchability are significant for devices, which determine adhesion to skin influence accuracy. Here, a stretchable ultrathin optical sensor based on self‐assembled wavy microfiber is proposed. Thanks “bottom–up” strategy, wave structure can be adjusted artificially, paving way design devices. Due...
The real-time, in-line analysis of light polarization is critical in optical networks, currently suffering from complex systems with numerous bulky opto-electro-mechanical elements tandemly arranged along the path. Here, we design and fabricate a fiber-integrated polarimeter by vertically stacking three photodetection units based on six-layer van der Waals materials, including one bismuth selenide (Bi2Se3) layer for power calibration, two twisted black phosphorus (BP) layers detection,...
Real-time intraocular pressure (IOP) monitoring plays a crucial role in glaucoma diagnosis and treatment. The wireless smart contact lens based on flexible inductor-capacitor-resistor (LCR) sensor is chip-free battery-free, demonstrating excellent application potential for physiological signal monitoring. To promote the use of LCR lenses clinical IOP monitoring, reliable, comfortable materials should be used sensitivity needs to realized. Here, we propose method producing hydrogel-based that...
We present a near-eye display featuring triple-channel waveguide with chiral liquid crystal gratings. Our is capable of dividing one field view into three through both the polarization orthogonality and angular separation. To illustrate its principle, k-space diagram, which takes account aspect ratio view, depicted. results demonstrate that diagonal reaches 90°, eye relief 10 mm, exit pupil 4.9 × mm2, transmittance 4.9%, uniformity 89%.
Abstract Eye tracking techniques enable high-efficient, natural, and effortless human-machine interaction by detecting users’ eye movements decoding their attention intentions. Here, a miniature, imperceptible, biocompatible smart contact lens is proposed for in situ wireless eye-machine interaction. Employing the frequency encoding strategy, chip-free battery-free successes movement closure. Using time-sequential algorithm, has great angular accuracy of <0.5°, which even less than vision...
Pressure sensing plays an important role in many industrial fields; conventional electronic pressure sensors struggle to survive the harsh environment. Recently microelectromechanical systems (MEMS) fiber-optic Fabry–Perot (FP) have attracted great interest. Here we review basic principles of MEMS FP and then discuss based on different materials their applications. We also introduce recent progress, such as two-photon polymerization-based 3D printing technology, state-of-the-art this field,...
Zero-index metamaterials exhibit a uniform spatial phase distribution, promising numerous applications such as efficient electromagnetic tunneling and high-fidelity optical computing. These necessitate an integrated, low-loss zero-index waveguide platform for guiding, routing, interfering light. Nevertheless, existing grapple with substantial footprints, high losses, limited flexibility. Here, we present nanoscale metawaveguides enabled by quasi-bound states in the continuum, formed through...
We fabricate a simple, compact, and stable temperature sensor based on liquid-sealed photonic crystal fiber (PCF) in-line nonpolarimetric modal interferometer. Different from other reported PCF devices, it does not need expensive polarimetric the liquid is sealed in one fiber. The device consists of stub isopropanol-filled spliced between standard single-mode fibers. sensitivity (-166 pm/°C) increases over an order magnitude compared with those previous sensors air-sealed interferometers...
A compact highly sensitive microfiber coupler based reflective micro-force sensor is presented. The device fabricated by fusing two twisted optical fibers and then connecting of the pigtails to form a Sagnac loop. has high force sensitivity ~3754 nm/N which three orders magnitude larger than traditional fiber sensors, low detection limit ~1.6 µN. good repeatability also shown in this paper.
We experimentally demonstrate a microfiber Bragg grating force sensor with ultra-high sensitivity. The fiber (FBG) is inscribed in tapered from standard non-photosensitive single-mode by focused ion beam machining method, and has compact size (∼112 μm length). Small diameter increases the sensitivity of such when acting as force-sensing element under tensile loads. have demonstrated high ∼3146 nm/N around resonant wavelength 1538 nm, which three orders magnitude larger than FBGs untapered fibers.
Ultrafast lasers generating high-repetition-rate ultrashort pulses through various mode-locking methods can benefit many important applications, including communications, materials processing, astronomical observation, etc. For decades, based on dissipative four-wave-mixing (DFWM) has been fundamental in producing with repetition rates the order of gigahertz (GHz), where multiwavelength comb filters and long nonlinear components are elemental. Recently, this method improved using...
Systemic blood circulation is one of life activity’s most important physiological functions. Continuous noninvasive hemodynamic monitoring essential for the management cardiovascular status. However, it difficult to achieve systemic with daily use current devices due lack multichannel and time-synchronized operation capability over whole body. Here, we utilize a soft microfiber Bragg grating group monitor spatiotemporal hemodynamics by taking advantage high sensitivity, electromagnetic...
A dual-frequency liquid crystal based optical switch with orthogonally photo-patterned alignments is designed and fabricated. The cell gap theoretically optimized for high switching performance. measured extinction ratio of first diffraction order over 20 dB a low electric field 3 V/μm. On-Off time are to be 350 μs 600 μs, respectively, both which have reached submillisecond scale. Moreover, the polarization independent, has been predicted further proved experimentally. This design suitable...
The speed and the overall loading of a train are great importance in determining whether entire is running safe stable manner. We present here our work developing wireless rail monitoring system using IoT (Internet-of-Things) sensors edge computing to provide accurate real-time state parameters trains continuously over time. By placing MEMS-based sensing (overall size 50×50×17 mm) on collect vibration information under excitation by wheels passing trains, technique analyze these captured...
Abstract Recently, microfiber-optic sensors with high sensitivity, fast response times, and a compact size have become an area of interest that integrates fiber optics nanotechnology. Distinct advantages optical microfiber, such as large accessible evanescent fields convenient configurability, provide attractive benefits for micro- nano-scale sensing. Here, we review the basic principles based on broad range microstructures, nanostructures, functional materials. We also introduce recent...
We demonstrate a fiber magnetic field sensor based on multimode specklegrams. The is detected by measuring the change of speckle patterns with digital correlation technology. When induction increases 50 mT, response coefficient more than 0.35. sensitivity 0.00705 mT <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> - 1</sup> for range 50-100 and resolution 0.284 mT. temperature cross studied establishing sensing matrix. In addition, dynamic...
Abstract The core-collapse supernova remnant (SNR) Cassiopeia A (Cas A) is one of the brightest galactic radio sources with an angular radius <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo>∼</mml:mo> <mml:mn>2</mml:mn> <mml:mover accent="true"> <mml:mrow> <mml:mi>.</mml:mi> </mml:mrow> <mml:mi>′</mml:mi> </mml:mover> <mml:mn>5</mml:mn> </mml:math> . Although no extension this source has been detected in γ -ray band, using more than 1000 days LHAASO data...
A temperature insensitive three-turn microfiber coil resonator (MCR) is demonstrated by embedding it in Teflon with opposite thermo-optic coefficient. The dependence of a MCR strongly depends on the size which controls ratio thermal effect contributions from silica and polymer. Fabricated ~3μm-diameter microfiber, our compensated to less than 6pm/°C. Further suppression can be realized ideal radius.
We fabricate a miniature tapered photonic crystal fiber (PCF) interferometer with enhanced sensitivity by acid microdroplets etching. This method is very simple and cost effective, avoiding elongating the PCF, moving refixing device during etching, measuring. The refractive index sensing properties different PCF diameters are investigated both theoretically experimentally. tapering velocity can be controlled microdroplet size position. greatly increases (five times, 750 nm/RIU) decreases...
We fabricate a miniature ultra-sensitive refractive index sensor based on tapered photonic crystal fiber (PCF) modal interferometer. The PCF is slightly and little elongated to keep the size compact. total length ~ 2 cm, potential sensitivity more than 1600 nm/RIU (refractive unit), which nearly eight times as high that of an untapered