A5078874633- Photonic and Optical Devices
- Gas Sensing Nanomaterials and Sensors
- Advanced Sensor and Energy Harvesting Materials
- Advanced Fiber Optic Sensors
- Mechanical and Optical Resonators
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Spectroscopy and Laser Applications
- Photoacoustic and Ultrasonic Imaging
- Analytical Chemistry and Sensors
- Ultrasound Imaging and Elastography
- Tactile and Sensory Interactions
- Conducting polymers and applications
- Ultrasonics and Acoustic Wave Propagation
National University of Singapore
2018-2020
Multi-frequency ultrasonic transducers are highly promising devices in biomedical applications for providing both good imaging resolution and large detection depth. However, most conventional multi-frequency designed through integrating multiple single-frequency transducers, with complicated fabrication process, imperfect beam profiles, limited bandwidths. In this paper, a single-element piezoelectric micromachined transducer (MF-pMUT) is proposed investigated terms of broadband property....
A novel relative humidity sensor that is based on a linear piezoelectric micromachined ultrasonic transducer (pMUT) array was proposed and microfabricated for high sensitivity, fast response, good stability. The humidity-sensitive graphene oxide (GO) film deposited the pMUT with facile drop-casting method characterized by scanning electron microscope (SEM), atomic force (AFM), Fourier transform infrared spectrum (FTIR). With level ranging from 10% to 90% RH, exhibited sensitivity of 719 Hz/%...
Waveguides have been utilized for label-free and miniaturized mid-infrared gas sensors that operate on the evanescent field absorption principle. For integrated systems, photodetectors based photocarrier generation principle are previously with waveguides. However, due to thermal excitation of carriers at room temperature, they suffer from large dark currents noise in long-wavelength region. In this paper, we introduce integration a MEMS-based broadband infrared thermopile sensor waveguides...
We demonstrate a multifunctional photonic switch on silicon-on-insulator platform operating at the mid-infrared wavelength range (3.85–4.05 µm) using suspended waveguides with sub-wavelength cladding and micro-electro-mechanical systems (MEMS) tunable waveguide coupler. Leveraging flip-chip bonding technology, top wafer acting as electrode is assembled above silicon-on-insular to enable electrostatic actuation. Experimental characterizations for functions of proposed device include (1) an...
We report a type of miniaturized and self-powered gas identification platform for wearable applications that works on the principle ion mobility transients offering high degree selectivity variety species. The operation sensor exploited voltage output from systematically designed triboelectric nanogenerator (TENG). multi-layer TENG provided order kV just by finger triggering, which was further leveraged in special electrode (tip-plate) configuration making it possible to obtain plasma...
We report integration of infrared (IR) thermopile sensor with Mid-IR waveguides via flip-chip bonding technology. A photonic device input and output grating couplers designed at 3.72um are fabricated on silicon-on-insulator (SOI) platform integrated a bare chip its side to realize for myriad range sensing applications.