A5044689226- Terahertz technology and applications
- Near-Field Optical Microscopy
- Plasmonic and Surface Plasmon Research
- Superconducting and THz Device Technology
- Integrated Circuits and Semiconductor Failure Analysis
- Photonic Crystals and Applications
- Advanced Electrical Measurement Techniques
- Semiconductor Quantum Structures and Devices
- Microwave and Dielectric Measurement Techniques
- Non-Destructive Testing Techniques
- Photonic and Optical Devices
- Microwave Imaging and Scattering Analysis
- Geophysical Methods and Applications
- Ultrasonics and Acoustic Wave Propagation
- Spectroscopy and Laser Applications
- Microwave Engineering and Waveguides
- Antenna Design and Optimization
Jilin University
2016-2020
Chongqing Institute of Green and Intelligent Technology
2018-2020
Abstract Objectives Terahertz (THz)‐based imaging techniques hold great potential for biological and biomedical applications, which nevertheless are hampered by the low spatial resolution of conventional THz systems. In this work, we report a high‐performance photoconductive antenna microprobe‐based near‐field time‐domain spectroscopy scanning microscope. Materials methods A single watermelon pulp cell was prepared on clean quartz slide covered thin polyethylene film. The high performance...
Scattering-type scanning near-field optical microscopy (s-SNOM) has been playing more and important roles in investigating electromagnetic properties of various materials structures on the nanoscale. In this technique, a sharp tip is employed as antenna to measure sample's with high spatial resolution. As scattered signal from extremely weak contaminated by strong background noise, effective detection, subsequent extraction information detected signals key issue for s-SNOM. review, we give...
Photoconductive antenna microprobe (PCAM)‐based terahertz (THz) near‐field imaging technique is promising for biomedical detection due to its excellent biocompatibility and high resolution; yet it limited by speed the difficulty in control of PCAM tip‐sample separation. In this work, we successfully realized mouse brain tissue slices using an improved home‐built PCAM‐based THz microscope. system, was enhanced designing applying a voice coil motor‐based delay‐line. The separation implemented...
A home-built scattering-type scanning near-field millimeter-wave microscope based on a 110-GHz continuous-wave solid-state source is demonstrated with spatial resolution of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$1~\mu \text{m}$ </tex-math></inline-formula> , approximately 1/3000 the incident wavelength, and signal-to-noise ratio 23.8 dB. The relationship between length tip (antenna) wavelength for...
With the development of terahertz (THz) technology, applications this spectrum have become increasingly wide-ranging, in areas such as non-destructive testing, security and medical scanning, which one most important methods is imaging. Unlike remote sensing applications, THz imaging features sources array elements that are almost always supposed to be spherical wave radiators, including single antennae. As such, well-developed methodologies Range-Doppler Algorithm (RDA) not directly...
Millimeter wave (mmW) propagation parameters including transmission, attenuation, and reflection coefficients of coal were obtained experimentally in the frequency region W-band (75-110 GHz). In addition, a raster scanning mmW imaging system transmission modalities was developed, which forms images according to difference between dielectric cracks those bulk samples, using spectrum module vector network analyzer radiate signal object obtain from S-parameters. The electromagnetic simulation...
Far-field and near-field THz imaging techniques have been employed to image different biological samples. First, far-field THz-TDS system was exploited freshly excised mouse melanoma tissue slices, from which the normal diseased areas can be detected, unambiguously. Second, photoconductive antenna microprobe-based system, with a calibrated resolution of $\sim5$ $\mu \rm{m}$, has developed successfully utilized brain tissues individual fruit cells. Finally, tip-scattering based microscope...
In a self-homodyne detection scheme for the near-field terahertz wave under ambient conditions, it has been demonstrated that intensity technique was superior to electric field technique.
To improve the low resolution of differential frequency signal processing associated with CW THz nondestructive testing, we proposed a novel IF scheme, significantly improved resolution, without sacrifice in dynamic range.
In terahertz time-domain spectroscopy (THz-TDS), the THz electric field strength is generally characterized by photocurrent of receiver, which extracted from in-phase component output lock-in amplifier (LIA) in system. As to LIA, directly influenced phase difference between voltage/current input (the signal receiver) and reference signal. Since changing during testing sample often ignored experiments, a quantitative rounded analysis effect on result presented this paper provide go-to source...