A5100731078- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Spectroscopy and Laser Applications
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced MEMS and NEMS Technologies
- Analytical Chemistry and Sensors
- Mechanical and Optical Resonators
- Gas Sensing Nanomaterials and Sensors
- Atmospheric Ozone and Climate
- Shape Memory Alloy Transformations
- Atmospheric and Environmental Gas Dynamics
- Optical Wireless Communication Technologies
- Geotechnical Engineering and Underground Structures
- Quantum optics and atomic interactions
- Metamaterials and Metasurfaces Applications
- Advancements in Battery Materials
- Geophysics and Sensor Technology
- Plasmonic and Surface Plasmon Research
- Optical Coherence Tomography Applications
- Laser Design and Applications
- Advanced Chemical Sensor Technologies
Hong Kong Polytechnic University
2016-2025
China Academy of Information and Communications Technology
2024-2025
Shenzhen Polytechnic
2015-2024
Science and Technology on Surface Physics and Chemistry Laboratory
2022-2024
The University of Sydney
2020-2024
Chongqing Institute of Geology and Mineral Resources
2024
Bureau of Geology and Mineral Exploration and Development of Guizhou Province
2024
Xi'an High Tech University
2024
Shanghai Jiao Tong University
1997-2024
Ruijin Hospital
2024
Subambient daytime radiative cooling (SDRC) provides a promising electricity- and cryogen-free pathway for global energy-efficiency. However, current SDRC systems require stringent surface designs, which are neither cost-effective nor eco-friendly, to selectively emit thermal radiation outer space simultaneously maximize solar reflectance. Here, generic method is developed upgrade the conventional building-coating materials with peculiar self-adaptive effect through combining particle...
A miniature fiber-tip pressure sensor was built by using an extremely thin graphene film as the diaphragm. The also acts a light reflector, which, in conjunction with reflection at fiber end-air interface, forms low finesse Fabry-Perot interferometer. based demonstrated sensitivity over 39.4 nm/kPa diaphragm diameter of 25 μm. use material would allow highly sensitive and compact sensors.
A fiber-optic Fabry-Pérot acoustic sensor with a <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">${\sim}{100}\hbox{-}{\rm nm}$</tex></formula> -thick multilayer graphene diaphragm is reported. Acoustic testing demonstrates pressure-induced deflection of 1100 nm/kPa and noise equivalent signal level xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${\sim}{\rm 60}~\mu{\rm Pa}/{\rm...
Abstract Photothermal interferometry is an ultra-sensitive spectroscopic means for trace chemical detection in gas- and liquid-phase materials. Previous photothermal systems used free-space optics have limitations efficiency of light–matter interaction, size optical alignment, integration into photonic circuits. Here we exploit photothermal-induced phase change a gas-filled hollow-core bandgap fibre, demonstrate all-fibre acetylene gas sensor with noise equivalent concentration 2 p.p.b. (2.3...
Abstract Laser spectroscopy outperforms electrochemical and semiconductor gas sensors in selectivity environmental survivability. However, the performance of state-of-the-art laser is still insufficient for many high precision applications. Here, we report mode-phase-difference photothermal with a dual-mode anti-resonant hollow-core optical fiber demonstrate all-fiber (acetylene) detection down to ppt (parts-per-trillion) <1% instability over period 3 hours. An could be designed transmit...
Abstract Dual-comb spectroscopy (DCS) has revolutionized optical by providing broadband spectral measurements with unprecedented resolution and fast response. Photothermal (PTS) a pump-probe configuration offers highly sensitive gas sensing method, which is normally performed using single-wavelength pump laser. The merging of PTS DCS may enable spectroscopic method taking advantage both technologies, never been studied yet. Here, we report dual-comb photothermal (DC-PTS) passing dual combs...
Importance Most epidemiological studies of heart failure (HF) have been conducted in high-income countries with limited comparable data from middle- or low-income countries. Objective To examine differences HF etiology, treatment, and outcomes between groups at different levels economic development. Design, Setting, Participants Multinational registry 23 341 participants 40 high-income, upper–middle-income, lower–middle-income, countries, followed up for a median period 2.0 years. Main...
We report the modeling results of an all-fiber gas detector that uses photonic crystal fiber (PCF). The relative sensitivity PCF as a function parameters is calculated. Gas-diffusion dynamics affect sensor response time investigated theoretically and experimentally. A practical aiming for high detection proposed.
We investigate the microhole collapse property of different photonic crystal fibers (PCFs) and its effect on splice loss using an electric arc fusion splicer. The physical mechanism for kinds PCFs is studied, a guideline splicing these conventional single-mode (SMFs) proposed. demonstrate low-loss five with SMFs, including large-mode PCF, hollow-core nonlinear PCFs, polarization-maintaining PCF.
A long-period fiber-grating sensor with a high strain sensitivity of −7.6 pm/με and low temperature 3.91 pm/°C is fabricated by use focused CO2 laser beam to carve periodic grooves on large- mode-area photonic crystal fiber. Such can effectively reduce the cross-sensitivity between temperature, temperature-induced error obtained only 0.5 με/°C without using compensation.
A simple method for fabricating selective injection microstructured optical fibers (MOFs) using a conventional fusion splicer is described. The effects of current, duration and offset position on the hole collapse property MOFs are investigated. With this method, central hollow-core holes in cladding region can be selectively infiltrated, which allows fabrication novel hybrid polymer-silica liquid-silica various applications.
Many optical fiber sensors designed to recover quasi-static strain fields in the presence of significant temperature changes have been reported recent years. A general theoretical analysis influ- ence systematic errors associated with measurement process is presented and applied a range techniques that are current inter- est literature. The performances methods based on Bragg grating sensors, polarization-maintaining Fabry-Perot interfer- ometers, combined dual-mode interference/polarimetry...
Utilizing the high birefringence and low-temperature coefficient of highly birefringent photonic crystal fiber (HiBi-PCF), a temperature-insensitive interferometer made from HiBi-PCF loop mirror (FLM) is achieved. For wavelength spacing 0.43 nm, variation with temperature only 0.05 pm//spl deg/C, transmission peak shift 0.3 deg/C demonstrated. The stability FLM improved dramatically when it uses HiBi-PCF, as compared to FLMs using conventional HiBi fibers.
Long period gratings (LPGs) are fabricated by use of focused high frequency CO 2 laser pulses to periodically modify the transverse dimension silica microfibers.A 20-period LPG with a 27dB attenuation dip is realized in microfiber diameter ~6.3µm.The resonant wavelength has negative temperature coefficient and sensitivity external refractive index.The LPGs may be useful micron scale in-fiber devices sensors.
This paper overviews recent development in gas detection with micro- and nano-engineered optical fibers, including hollow-core suspended-core tapered micro/nano fiber-tip micro-cavities. Both direct absorption photoacoustic spectroscopy based schemes are discussed. Emphasis is placed on post-processing stock fibers to achieve better system performance. Our demonstration of distributed methane a ∼75-m long photonic bandgap fiber also reported.
A novel fiber-tip micro-cavity pressure sensor was fabricated by use of a fusion splicer and pressurizing gas chamber. The fabrication process is simple efficient without the need for careful cleaving, chemical etching, bonding. Micro-cavities with wall thickness few micrometers demonstrated sensitivity ~ 315 pm/MPa . sensors have compact size, good mechanic strength, high temperature stability up to 600 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Abstract Chirality is a universal geometric property in both micro‐ and macroworlds. Recently, optical chiral effects have drawn increased attention due to their great potential fundamental studies practical applications. Significantly, the response of artificial structures can be enhanced by orders magnitude compared that naturally occurring counterparts. These man‐made generally exhibit two types chirality: extrinsic chirality intrinsic chirality. The former relies on external illumination...
We propose and experimentally verify an innovative label-free optical fiber biosensor based on a Mach-Zehnder interferometer for bovine serum albumin (BSA) concentration detection. The proposed utilized micro-cavity within single-mode to induce interference. A remarkable feature of this is that external media can directly interact with the core signal through microfluidic channels connected sensor surface. device was fabricated by means femtosecond laser micromachining chemical etching. type...
Sensors are devices or systems able to detect, measure and convert magnitudes from any domain an electrical one. Using light as a probe for optical sensing is one of the most efficient approaches this purpose. The history using some methods based on absorbance, emissive florescence properties date back 16th century. field sensors evolved during following centuries, but it did not achieve maturity until demonstration first laser in 1960. unique become particularly important case laser-based...
Charge transport plays an important role in defining both far-field and near-field optical response of a plasmonic nanostructure with ultrasmall built-in nanogap. As the gap size gold core-shell nanomatryoshka approaches sub-nanometer length scale, charge may occur strongly alter enhancement within molecule-filled In this work, we utilize ultrasensitive surface-enhanced Raman spectroscopy (SERS) to investigate variation induced by molecular junction conductance-assisted electron...
Abstract Efficient frequency up-conversion of coherent light at the nanoscale is highly demanded for a variety modern photonic applications, but it remains challenging in nanophotonics. Surface second-order nonlinearity noble metals can be significantly boosted up by plasmon-induced field enhancement, however related far-field second-harmonic generation (SHG) may also quenched symmetric plasmonic nanostructures despite huge near-field amplification. Here, we demonstrate that SHG from single...