A5009375235- Calibration and Measurement Techniques
- Advanced Antenna and Metasurface Technologies
- Metamaterials and Metasurfaces Applications
- Infrared Target Detection Methodologies
- Optical Systems and Laser Technology
- Antenna Design and Analysis
- Photovoltaic System Optimization Techniques
- Atmospheric Ozone and Climate
- solar cell performance optimization
- Spectroscopy and Laser Applications
- Advanced Measurement and Metrology Techniques
- Optical Imaging and Spectroscopy Techniques
- Advanced Measurement and Detection Methods
- Advanced Sensor Technologies Research
- Silicon and Solar Cell Technologies
- Solar Radiation and Photovoltaics
- Ocular and Laser Science Research
- Radiative Heat Transfer Studies
- Surface Roughness and Optical Measurements
- Advanced Fluorescence Microscopy Techniques
- Power Systems and Renewable Energy
- Chalcogenide Semiconductor Thin Films
- Photoacoustic and Ultrasonic Imaging
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
Hefei Institutes of Physical Science
2024
Institute of Plasma Physics
2024
Chinese Academy of Sciences
2024
University of Science and Technology of China
2024
National Institute of Metrology
2018-2021
China Telecom (China)
2014
Beijing Institute of Technology
2010
Beijing Institute of Optoelectronic Technology
2010
In order to design optical metamaterials surpass the limitation of unnaturally high refractive index in visible range, we propose nanocylinders nanostructure with hexagonal close-packed arrangement precisely control electric and magnetic resonances, resulting manipulation effective metamaterials. By drastically increasing strong capacitive coupling between decreasing diamagnetic effect core-shell nanostructure, designed can be achieved 10.5 region. The solid significantly suppressed by using...
Ultrathin metamaterials provide new possibilities for the realization of cloaking devices because their ability to control electromagnetic waves. However, applications in have been limited primarily reflection-type carpet cloaks. Hence, a transmissive free-space cloak was developed using multilayer frame structure, wherein highly transparent were used guide incident waves into propagating around an object. The effect quantitatively verified near-field and far-field distributions....
Ultrathin metasurface provides a completely new path to realize cloaking devices on account of their fascinating ability control electromagnetic wave. However, the conventional are limited by narrow bandwidth. To overcome this challenge, we present realization ultrabroadband and wide angle through high refractive index dielectric layer antireflective "moth-eye-like" microstructure in work. Two options proposed demonstrated numerically terahertz region. By using local phase compensation,...
An absolute cryogenic radiometer (ACR) with a detachable optical window was designed and built for high accuracy radiant power measurement photodetector spectral responsivity calibration. The ACR receiver is an electroplated pure copper cavity 50-μm-thick wall inner surface coated specular black polymer material mixed highly dispersible carbon nanotubes. absorptivity of the receivers evaluated to be ≥0.9999 in 250 nm–16 μm wavelength range ≥0.99995 500 μm. works at temperature ~5.2 K...
In order to improve the transmitted efficiency of metasurfaces, three-layer unit cell structure with coupling characteristics between layers was proposed. Using these Pancharatnam-Berry phase element particles structure, we constructed encoded metasurfaces different sequences control scattered waves. However, manipulation continuous transmission angle requires change encoding metasurface period. Since size in coded cannot be designed infinitesimally small, it is impossible obtain...
The conversion efficiency measurement accuracy of solar cell is heavily rely on the uncertainty pulsed simulator. assessment method simulator widely analyzed and studied. This paper describes irradiance non-uniformity which one three most important factors(spectral mismatch, instability irradiance) influencing uncertainties. An experiment using a real was performed to testify validity method. results provide theoretical data basis for further analysis overall uncertainties simulators.
LED-based integrating sphere light sources (LED-ISLSs) in the size of typical microscope slides were developed to calibrate radiance responsivity optical imaging microscopes. Each LED-ISLS consists a miniaturized with diameter 4 mm, an LED chip integrated on printed circuit board, and thin circular aperture 1 mm as exit port. The non-uniformity radiant exitance LED-ISLSs was evaluated be 0.8%. normal range (5∼69) W m-2 sr-1 measured standard uncertainty 1.3% using two precision apertures...
Solar simulators are widely used for indoor measurement of current-voltage (I-V) characteristics as well irradiance exposure tests terrestrial photovoltaic (PV) devices. The influence solar simulator's performance, commonly including spectral mismatch and uniformity/temporal stability, can never be ignored, especially in the case I-V measurement. Herein, we present an integrated system performance calibration according to IEC 60904-9, which proposed requirements defined classifications...
Solar simulator is a key instrument for photovoltaic field, which aims to act the role of natural sunlight irradiance indoor, and we should identify how similar they are in quantity. The critical factor similarity lies its spectral irradiance, because solar cells' wavelength-dependent responsivity, mismatch can induce large errors during characteristic parameters measurement. In this article, method measuring simulator's was proposed along with uncertainty analysis. A calibrated fiber optic...
Regarding to the mistakes that optoelectronic devices such as CCD focal plane arrays are often placed on exit port of integrating sphere source perform calibration, output irradiance uniformity is analyzed, basis which rational using calibrate obtained. Two theoretical models based numerical analysis method and Monte Carlo developed respectively. The consider two fundamental situations sources, namely (1) ideal lambertian (2) non-ideal source. distribution regularity was generalized by...
Abstract The application of metasurface in invisibility technology is mainly based on its phase control function, which provides a new choice for the design ultra-thin carpet cloaking devices with arbitrary shape. At present, most focus metal structure metasurfaces. Ohmic loss metallic materials seriously affects efficiency devices. To reduce and improve reflection efficiency, dielectric resonance cylindrical harmonic oscillator proposed to construct layer. Based analysis principle cloaking,...
Abstract The modulation of the required light wavefront polarization and phase based on geometric encoding metasurface (GPEM) has recently become a hot topic. However, transmission coefficient is greatly decreased when structure rotated. To address this problem, solution adding tapered antireflection layer to substrate design an all‐dielectric composed titanium dioxide silicon in visible band with 93.65%, proposed. When circularly polarized incident designed metasurfaces rotating unit...
A primary standard measurement facility based on differential spectral responsivity (DSR) method for calibration of reference solar cells was realized at National Institute Metrology (NIM), China. The the critical parameters and short-circuit current cells, not only with WPVS (World photovoltaic Scale) design but non-regularly shaped, can be performed by this facility. linearity carried out measuring DSR different bias levels in range from 300nm to 1200nm. characterization performance were...
The opto-electronic conversion function (OECF) is defined as relationship between input luminance and digital output levels for an image capture system. It a fundamental parameter to evaluate the performance of still-picture camera. An experiment device was set up measure OECFs by using test charts with twelve neutral patches stepped in different visual density increments integrating sphere uniform illuminator. To determine camera OECFs, images were captured under controlled conditions...
An absolute cryogenic radiometer (ACR) has been developed at the National Institute of Metrology China. The system was built based on a mechanical cooling system, with cavity receiver working 5.2 K and noise-equivalent power ~2 nanowatts. ACR made from pure copper by electroplating, weighing only <1 g. inner surface coated polymer material mixed carbon nanotubes which is absorptive in wide spectral range 250 nm to above 16 m. relative standard uncertainty for calibration optical radiant...
Abstract The spectral optical radiant power of a quantum cascade laser (QCL) in the (7.35–10.6) µm range has been measured using Y-shape absolute cryogenic radiometer (ACR). responsivity (SR) transfer detector based on an integrating-sphere-coupled mercury-cadmium-telluride (IS-MCT) photoconductive calibrated. QCL can be adjusted and stabilized (0.035–0.6) mW. relative uncertainty ACR-based measurement was evaluated to 0.023%–0.04% ( k = 1). SR calibration IS-MCT analyzed 0.097%–0.16% for...
Synthetic Aperture Radar (SAR) emits microwave electromagnetic pulses and detects remote targets through the backscattered echo signals. With continuous advancement of technology, high-resolution SAR imaging can accurately observe various with small sizes, dense connections, diverse shapes. The steep terrain or tall objects in images display prominent shadows due obstruction ground-facing waves resulting weak signals shadowed areas. Small generate discrete contours similar to optical when...