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Featured researches published by Cui Dafu.


asia pacific microwave conference | 1997

A microstructure semiconductor thermocouple for microwave power sensors

Chen Deyong; Cui Dafu; Han Jinghong; Chen Shaofeng; Wang Li; Li Zigao; Fu Binxiang

By using standard silicon planar process, combined with an anisotropically etch technology, a microstructure Si-Ta/sub 2/N thermocouple for microwave power sensors has been fabricated. The sensor has a sensitivity as high as 200 /spl mu/V/mW over a frequency range of 10 MHz to 18 GHz at a power level from 1 /spl mu/W to 100 mW.


Sensors and Actuators B-chemical | 1993

Optical-fibre pH sensor

Cui Dafu; Cao Qiang; Han Jinghong; Cai Jinge; Li Yating; Zhu Zemin

Abstract A kind of optical-fibre pH sensor which has immobilized pH-sensitive indicator dye reagents on the tip of the optical fibre has been studied. The probe is made by covalently immobilizing phenol red, bromine phenol blue or bromothymol blue on the polyacrylamide microsphere fixed by polytetrafluorethylene (PTFE) film. A gap between the dye and the optical fibre is used to facilitate the diffusion of the hydrogen ion. The parameters of the optical-fibre pH sensor are given. The ranges of measurement are 3.0–5.0, 7.0–8.5 and 8.0–10.0 pH for bromine phenol blue, phenol red and bromothymol blue, respectively. The sensitivity is 66.6 mV/pH, and the probe has a precision better than 0.05 pH. The linear correlation coefficient is 0.999. The response time is 1–2 min. The hysteresis is 0.52%. The repeatability is 0.013 mV, while the stability is 0.015 pH/h.


Sensors and Actuators B-chemical | 1995

A new type of transcutaneous Pco2 sensor

Han Jinghong; Cui Dafu; Li Yating; Cai Jine; Dong Zheng; Zhang Hong; Shi Chenglin

A new type of transcutaneous P co2 sensor has been developed. It can monitor arterial blood CO 2 gas continuously. The P co2 sensor consists of an H + -ISFET, Ag/AgCl solid reference electrode, a heater and a heat-sensitive sensor, hydrogel-containing electrolyte, a CO 2 gas-permeable membrane, etc. The sensors measurement range is 4-300 mmHg. Its sensitivity is 40 mV/P co2 , the correlation coefficient is 0.9985 and the response time is less than 2 min.


Infrared Physics | 1991

Quantum well infrared detector with grating enhancement

Cui Dafu; Chen Zhenghao; Zhou Yueliang; Lu Huibin; Xie Yuanlin; Yang Guozhen

Abstract We have investigated theoretically enhanced quantum well IR detector. The field enhancement expressions are given by means of the perturbation method. The quantum efficiency and enhancement ratio have been obtained for a doped GaAs/AlGaAs quantum well structure at λ = 10 μm for different grating periods. We explained why Goossen and Lyon only observed a small enhancement.


Optics Letters | 1983

Study of resonant excitation of infrared surface second harmonic at the GaAs-Al interface.

Chen Zhenghao; Cui Dafu; Lu Huibin; Zhou Yueliang

By using a tunable TEA CO(2) laser and by grating coupling at the interface of GaAs-Al, we have obtained, for the first time to our knowledge, second-harmonic generation from a resonantly excited infrared surface polariton. The experimental results provided a dispersion relation that compares well with theoretical calculations. The deduced value of chi(2), 5.9 x 10(-7) esu, agrees well with other measurements.


Applied Superconductivity | 1996

Effects of DC magnetic field upon the properties of a HTS microstrip antenna at 4.2 K

Zhu Meihong; Cao Bisong; Li Na; He Aisheng; Zhang Xuexia; Zhao Yonggang; Dong Daijie; Wang Yujie; Zhou Yueliang; Lu Huibin; Cui Dafu; Yi Changlian; Luo Kunlun; Wang Yanju; Liu Tiejun; Gu Bing-Lin

Abstract A circular polarized microstrip antenna with a working frequency of 6.26 GHz was fabricated from YBCO HTS films. The transmission coefficient and circular polarization ratio of the antenna at different external magnetic field B were measured at 4.2 K. The experimental results showed that its transmission coefficient and circular polarization ratio hardly changed with B up to 1 T. It is concluded that the field-induced increase of surface resistance of YBCO films would not influence the microwave properties of this antenna at B ⩽ 1T and T = 4.2 K.


Acta Physica Sinica (overseas Edition) | 1996

Growth mode of Cu-rich particles on laser-ablated YBa2Cu3O7 thin films

Yang Ye; Liu Jun-zheng; Li Lin; Zhou Yuqing; Zhou Yueliang; Chen Zhenghao; Lu Huibin; Cui Dafu; Yang Guozhen

The microstructure of the laser-ablated YBa2Cu3O7 (YBCO) thin film deposited on heated (100) SrTiO3 substrate was examined by transmission electron microscope. The particles on the film mainly consist of CuO and few CuYO2. Most of these non-superconducting particles nucleate on or near the surface of the film and protrude about 100-400 nm in height. A large amount of a-axis YBCO grains also exist in the film, which nucleate at the substrate surface and grow perpendicularly above the c-axis YBCO film. The YBCO thin film deposited under low oxygen pressure has very different microstructure compared with YBCO thin film deposited under high oxygen pressure.


Chinese Physics Letters | 1995

Enhanced Stark Shift in GaAs/AlGaAs Step Quantum Well Under an Applied Electric Field

Ma Jianwei; Chen Zhenghao; Cui Dafu; Yuan Zhenyu; Yang Guozhen

Theoretical calculations of the quantum confined Stark shift for the first heavy hole exciton (hh1-e1) in step quantum well are given. A significant change in Stark shift is achieved in specially stepped potential shape, which is more than two times larger than the conventional rectangular quantum well. The structure has the advantage of a large change in absorption, which is one of the best candidates for the optical modulators utilizing the quantum confined Stark effect (QCSE) in GaAs/AlGaAs. Relations between QCSE and stepped structure are discussed in the optimization for large Stark shift.


Chinese Physics Letters | 1995

Intersubband Third-Order Nonlinearities in a GaAs/AlGaAs Step Quantum Well Structure by Phase Conjugation Method

Ma Jianwei; Chen Zhenghao; Cui Dafu; Lu Huibin; He Meng; Yang Guozhen

In this letter, we present the observation of phase conjugation at 9.27 μm in a GaAs/AlGaAs multiple step quantum well structure. The response is caused by the nearly resonant intersubband transition. The magnitude of χ(3) determined by this phase conjugation method is about 8 × 10-5 esu and the phase conjugate reflectivity η is about 6 × 10-3 uncorrected for Fresnel reflections.


Chinese Physics Letters | 1990

Study of the properties of infrared intersubband transition in doped GaAs/AlxGa1-xAs multiple quantum wells

Chen Zhenghao; Cui Dafu; Zhou Jun-Ming; Pan Shaohua; Huang Qi; Zhou Yueliang; Lu Huibin; Xie Yuanlin; Feng Simin; Yang Guozhen

The properties of intersubband transition of GaAs/AlxGa1-xAs multiple quantum wells with various well widths and doped-well concentrations have been studied. Both theoretical and experimental results are in good agreement. For the appropriate well width and higher doping concentration, we directly observed two intersubband absorption peaks from E1 → E2 and E2 → E3 transitions in well. The experimental results and theoretical analysis are given.

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Chen Xing

Chinese Academy of Sciences

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Zhang Lulu

Chinese Academy of Sciences

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Li Hui

Chinese Academy of Sciences

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