Article
Materials Science, Multidisciplinary
Zhang Zhang, Yuran Kang, Ni Yao, Jing Pan, Wen Yu, Yao Tang, Yue Xu, Liqiang Wang, Lei Zhang, Limin Tong
Summary: A new type of airflow sensor based on optical micro/nanofiber (MNF) has been proposed and realized, which utilizes a flexible polydimethylsiloxane (PDMS) cantilever embedded with a U-shaped MNF to achieve bending-dependent transmittance variation. By arranging four cantilevers in two orthogonal directions, omnidirectional airflow can be measured within a speed range of 15 m/s. The optimized cantilever design also allows for real-time monitoring and distinction of voice and respiratory signals with a resolution of 0.012 m/s, showing promising potential for health monitoring applications.
ADVANCED FIBER MATERIALS
(2021)
Article
Chemistry, Analytical
Hyun-Gue Hong, Sang Eon Park, Sang-Bum Lee, Myoung-Sun Heo, Jongcheol Park, Tae Hyun Kim, Hee Yeon Kim, Taeg Yong Kwon
Summary: The chip-scale atomic magnetometer based on coherent population trapping demonstrated high sensitivity near zero magnetic field and in low magnetic field environments. The device showed promise for integrated atomic magnetometers with a wide operating range, providing a noise floor comparable to conventional finite-field measurements.
Article
Engineering, Electrical & Electronic
Xiaoshuai An, Yumeng Luo, Binlu Yu, Liang Chen, Kwai Hei Li
Summary: The research demonstrates a novel integration of GaN chip with microdome-patterned PDMS film for pressure sensing, showing high sensitivity and stability for a wide range of applications.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Optics
Yuzhi Shi, Yongfeng Wu, Lip Ket Chin, Zhenyu Li, Jingquan Liu, Mu Ku Chen, Shubo Wang, Yi Zhang, Patricia Yang Liu, Xiaohong Zhou, Hong Cai, Wanzhen Jin, Yefeng Yu, Ruozhen Yu, Wei Huang, Peng Huat Yap, Limin Xiao, Wee Ser, Thi Thanh Binh Nguyen, Yu-Tsung Lin, Pin Chieh Wu, Jiayan Liao, Fan Wang, C. T. Chan, Yuri Kivshar, Din Ping Tsai, Ai Qun Liu
Summary: This study demonstrates a multifunctional virus manipulation technique that enables efficient trapping and manipulation of arbitrary number of viruses. Enhanced optical forces are produced by fine tuning of interference resonances in engineered arrays of nanocavities, allowing trapping and manipulation of viruses as small as 40 nm. This technique opens up new opportunities for studying virus pathogenesis and inhibitor development.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Analytical
Magno M. M. de Araujo, Jose P. da Silva
Summary: A refractive index sensor is designed based on an on-chip silicon nitride ridge waveguide long-range surface plasmon polariton. The sensor consists of a gold film and a Cytop polymer layer for plasmonic resonance. Geometric parameters are optimized using finite element method at the optical wavelength of 633 nm, and the spectral performance is evaluated from 580 to 680 nm. The proposed sensor shows potential for point-of-care applications due to its compactness and simplicity of construction.
Article
Engineering, Electrical & Electronic
Yingning He, Douglas Silva de Vasconcellos, David Bourrier, Kata Hajdu, Jean-Olivier Durand, Frederique Cunin, Veronique Bardinal, Thierry Leichle
Summary: An alternative porous silicon interferometer with horizontally oriented pores was proposed in this study, showing high sensitivity and low detection limit. Simulation studies indicated that the addition of Bragg mirrors on the membranes could improve the performance of lateral porous silicon interferometers, which could potentially be used as alternative solutions for on-chip development of porous silicon biosensors.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Engineering, Electrical & Electronic
Zhan Wang, Qi Xue, SaiLi Zhao, PengFei Wang, He Yang, XiaoHong Sun
Summary: This paper presents a liquid sealed temperature sensor based on SNCS optical fiber structure, which enhances temperature sensitivity to -355 pm/degrees C by encapsulating organic solvent and using special materials. Through microfluidic processing technology, the sensitivity of the sensor is improved while enhancing its resistance to damage.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Yong-Il Kim, Dabin Kim, Jihun Jung, Sang-Woo Kim, Miso Kim
Summary: This study demonstrates a method to enhance the piezoelectric performance of P(VDF-TrFE) fiber mat by electrospinning with a rapidly rotating collector. The aligned fiber mat produced from the modified drum collector showed significantly increased crystalline electroactive beta-phase content, leading to improved piezoelectricity.
Article
Optics
Alexander D. Griffiths, Johannes Herrnsdorf, Robert K. Henderson, Michael J. Strain, Martin D. Dawson
Summary: This paper addresses the challenging size, weight, and power requirements of small satellite communications modules by using chip-scale LED transmitters and single-photon avalanche diode receivers, achieving high data rates and sensitivity. Experimental results demonstrate the high potential of this approach for small satellite platforms.
Article
Chemistry, Analytical
Kotaro Haneda, Kenei Matsudaira, Ryusuke Noda, Toshiyuki Nakata, Satoshi Suzuki, Hao Liu, Hidetoshi Takahashi
Summary: This paper presents an airflow vector sensor designed for drones, which can directly detect airflow and improve flight stability. The sensor is compact, lightweight, and highly sensitive, capable of measuring wind velocity and direction.
Article
Nanoscience & Nanotechnology
Yi Xu, Baowei Gao, Axin He, Tongzhou Zhang, Jiasen Zhang
Summary: Optical displacement metrology is crucial in nanotechnology but lacks an ultracompact sensor with angstrom-scale resolution and large measurement range. This study proposes an optical displacement sensor with wavelength modulation, achieving subwavelength footprint, angstrom-level resolution, and a wide measurement range.
Article
Engineering, Electrical & Electronic
Xilin Liu, Hongjie Zhu, Tian Qiu, Srihari Y. Sritharan, Dengteng Ge, Shu Yang, Milin Zhang, Andrew G. Richardson, Timothy H. Lucas, Nader Engheta, Jan van der Spiegel
Summary: This study developed a fully-integrated wireless sensor-brain-machine interface system for communicating key somatosensory signals, fingertip forces, and limb joint angles to restore movement control after neurological injury, providing a novel solution for next-generation neural prostheses.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Zihao Dong, Dawei Shen, Zheng Gong, Deyuan Zhang, Yonggang Jiang
Summary: A flexible flow sensor is proposed for measuring airflow velocity and incident angle, consisting of a polyimide substrate, flat cantilever beam, and graphene piezoresistor. It demonstrates a wide detection range, high resolution, and better sensitivity to incident angles compared to curved cantilever sensors. Placement of these sensors on an airfoil is discussed for estimating flight parameters.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Multidisciplinary
Dawei Shen, Yonggang Jiang, Zhiqiang Ma, Peng Zhao, Zheng Gong, Zihao Dong, Deyuan Zhang
Summary: This flexible airflow sensor utilizes a novel curved microcantilever structure, especially in a cross-form configuration, with high sensitivity and direction-sensing capability. The structure of the curved microcantilevers allows for fluidic momentum to be converted into drag force, and the sensor sensitivity is shown to have a linear relationship with airflow velocity.
JOURNAL OF BIONIC ENGINEERING
(2022)
Article
Biophysics
Stefanie Fuchs, Veronika Rieger, Anders O. Tjell, Sarah Spitz, Konstanze Brandauer, Roland Schaller-Ammann, Juergen Feiel, Peter Ertl, Ingo Klimant, Torsten Mayr
Summary: A miniaturized enzymatic, optical glucose sensor element was developed for stable glucose measurements inside microfluidic systems, providing valuable information on the viability and metabolic state of cultured cells.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Optics
Jiahao Yin, Liang Chen, Yumeng Luo, Qing Wang, Hongyu Yu, Kwai Hei Li
Summary: This work demonstrates the superior optical and thermal performance of InGaN-based green LEDs with flip-chip design compared to conventional wire-bonding design. The flip-chip LED-PD device shows significant improvements in light output and detected photocurrent under an LED current of 200 mA. Analysis of optical, electrical, and thermal properties under varying LED currents provides important guidance for LED-PD integrated systems design at different current densities.
Article
Engineering, Electrical & Electronic
Yumeng Luo, Binlu Yu, Liang Chen, Kwai Hei Li
Summary: A micro humidity sensor based on a GaN chip with silica opal is fabricated, providing a linear relationship, compact size, low cost, high repeatability, and ease of integration and operation.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Chemistry, Analytical
Binlu Yu, Yumeng Luo, Liang Chen, Zhiqin Chu, Kwai Hei Li
Summary: The study introduces a novel, miniaturized, and easy-to-use optical sensor for accurate real-time humidity measurement. By integrating a photonic chip with an artificial opal layer, the sensor provides highly linear and repeatable response, large dynamic range, and fast response time, showing great potential for practical humidity-sensing applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Electrical & Electronic
Jiahao Yin, Hongying Yang, Yumeng Luo, Qing Wang, Hongyu Yu, Kwai Hei Li
Summary: The fabrication of a miniature III-nitride angle sensor is demonstrated in this study. By integrating the device with a liquid pendulum, the on-chip detectors can effectively measure the angle rotation with high precision, making it suitable for a wide range of practical applications.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Optics
Xiaoshuai An, Hongying Yang, Yumeng Luo, Qi Wang, Zhiqin Chu, Kwai Hei Li
Summary: A compact optical inclinometer in subcentimeter size is proposed, using a GaN-on-sapphire chip and a spherical glass cavity containing ethanol for angle measurement. The developed inclinometer exhibits high sensitivity and resolution in a wide linear range from -40 to +40 degrees, with excellent repeatability and stability confirmed through dynamic experiments.
Article
Chemistry, Multidisciplinary
Yong Hou, Jixiang Jing, Yumeng Luo, Feng Xu, Wenyan Xie, Linjie Ma, Xingyu Xia, Qiang Wei, Yuan Lin, Kwai Hei Li, Zhiqin Chu
Summary: A new method called GaN chipscope is proposed to quantitatively monitor the progression of various intracellular processes in a label-free manner. This method uses a cost-effective, ultrasensitive, and ultracompact GaN photonic chip for photoelectric readout and cellular imaging. The miniaturized chipscope is designed compactly for real-time observation of cell activities. This method shows great potential in both fundamental cell biology studies and clinical applications.
Article
Chemistry, Multidisciplinary
Jixiang Jing, Yong Hou, Yumeng Luo, Liang Chen, Linjie Ma, Yuan Lin, Kwai Hei Li, Zhiqin Chu
Summary: A highly sensitive salinity sensor based on a microscale III-nitride chip was developed, with enhanced long-term stability through a polymer antifouling coating. The sensor exhibits ultra-sensitivity, compactness, cost-effectiveness, fast response time, wireless compatibility, and ease of use, making it highly promising for in situ salinity sensing under varying environmental conditions.
Article
Nanoscience & Nanotechnology
Binlu Yu, Yumeng Luo, Jing Li, Huaiyu Ye, Kwai Hei Li
Summary: In this paper, a compact and near-hysteresis-free hydraulic pressure sensor was developed through interface engineering in a GaN chip-scale optical device. The sensor demonstrated superior performance in hysteresis, stability, repeatability, and response time, indicating its significant potential for various practical applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Optics
Xiaoshuai An, Hongying Yang, Yumeng Luo, Zhiqin Chu, Kwai Hei Li
Summary: This work presents a novel ultrafast optoelectronic proximity sensor based on a submillimeter-sized GaN monolithic chip. The on-chip units function as emitters and receivers, exhibiting high sensitivity and repeatability to object movement, as well as ultrafast response and real-time monitoring capability. The compact integration scheme presented in this study opens a new avenue for chip-scale proximity sensing devices.
PHOTONICS RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Hongying Yang, Yumeng Luo, Gaofei Lu, Yang Chai, Zhiqin Chu, Kwai Hei Li
Summary: In this letter, a miniature viscosity sensor based on GaN-on-sapphire optical device integrated with an inclined flow channel is demonstrated. The monolithic device, consisting of a pair of GaN diodes responsible for light emission and detection, can monitor droplet sliding. The proposed elegant design of a few centimeters in size is capable of distinguishing the liquid viscosities from 2 to 600 mPa center dot s in tens of seconds. The proposed optical sensor exhibits attractive features, such as compactness, low cost, ease of operation, and small liquid volume required, making it suitable for practical applications in liquid viscosity measurement.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Binlu Yu, Yumeng Luo, Jing Li, Huaiyu Ye, Kwai Hei Li
Summary: In this study, a compact and near-hysteresis-free hydraulic pressure sensor is developed in a GaN chipscale optical device through interface engineering. By modulating the reflectance properties at the sapphire interface, the sensor achieves high-performance pressure sensing.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Hongying Yang, Xiaoshuai An, Yumeng Luo, Liang Chen, Kwai Hei Li
Summary: This study reports a GaN-based optic device containing InGaN/GaN multiquantum wells that can emit and detect light. The angle-detecting mechanism is predicted by ray-trace simulations and verified by experimental measurements. The device's dynamic responses to tilt angle were investigated compared to three different liquids as liquid pendulums. The results show that the device exhibits superior resistance to magnetic interference compared to a commercial MEMS-based angle sensor. The proposed device's attractive features, such as high compactness, small size, low cost, large linear measuring range, and resistance to magnetic interference, open up new possibilities for the wide applications of angle detection based on GaN optical devices.
IEEE SENSORS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Jixiang Jing, Xiaoshuai An, Yumeng Luo, Liang Chen, Zhiqin Chu, Kwai Hei Li
Summary: Researchers have developed a compact pressure sensor with high sensitivity and fast response time, based on III-nitride photonic chip and PDMS membrane, enabling precise detection of pressure signals.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Jiahao Yin, Xiaoshuai An, Liang Chen, Jing Li, Jianan Wu, Yumeng Luo, Qing Wang, Hongyu Yu, Kwai Hei Li
Summary: The study focused on monolithic integrated photodetectors (PDs) in InGaN/GaN LEDs for monitoring LED intensity fluctuations. Through simulation and experiments, it was found that placing the PD in the center of the LED resulted in a 58% increase in detected photocurrent with minimal impact on the LED emission profile compared to placing the PD at the edge. Encapsulating the LED-PD device with yellow phosphor enabled white light emission, and the on-chip PD showed similar sensing behaviors to an external Si-based photodiode. The optimal monolithic PD design offered comparable sensing capabilities, compactness, insensitivity to ambient lighting, and minimal influence on the LED emission profile, making it suitable for real-time monitoring of LED intensity in practical and scientific lighting applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)