Design, simulation and validation of a novel uncooled infrared focal plane array

Shi, Shali; Jiao, Binbin; Chen, Dapeng; Li, Chaobo; Ding, Deyong; Ou, Yi; Ye, Tianchun; Duan, Zhihui; Wu, Xiaoping; Zhang, Qingchuan

doi:10.1016/j.sna.2006.03.034

Cited by 12 publications

(6 citation statements)

References 6 publications

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“…This behavior is expected because of the gold's higher thermal conductivity. The thermal conductivity of Au being 296 W mK −1[ 19 ] are much larger than that of Cu 2 Se (≈1.0 W mK −1 ) . [ 20 ] Earlier studies have shown that the thermal lattice coefficient increases as a result of increasing the thickness of the films.…”

Section: Resultsmentioning

confidence: 99%

Au Nanosheets‐Assisted Structural Phase Transitions, In Situ Monitoring of the Enhanced Crystallinity, and Their Effect on the Optical and Dielectric Properties of CuSe/Au/CuSe Thin Films

Qasrawi

Baniowdah

Samen

2022

Crystal Research and Technology

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Herein, stacked layers of copper selenide thin films comprising Au nanosheets in its structure are fabricated and characterized. The CuSe/Au/CuSe (CAC) thin films are prepared by the thermal evaporation technique under a vacuum pressure of 10−5 mbar. It is shown that Au nanosheets improve the stoichiometric growth of the CuSe thin films and induce the structural phase transitions from cubic to hexagonal. In addition, the in situ monitoring of the structural modifications in the CAC in the temperature range of 293–473 K proves the permanent enhanced crystallinity of the films. Optically, while the Au nanosheets increase the light absorbability and redshifts the energy band gap of CuSe, the in situ heating blueshifts the energy band gap. Moreover, insertion of Au nanosheets between layers of CuSe and heating them at 473 K significantly increase the dielectric constant and the optical conductivity by more than five times. Moreover, the drift mobility of charged carriers, the scattering time at femtosecond level, and the plasmon frequency are remarkably enhanced. Values of plasmon frequency exceed 6.0 GHz nominating the CAC films as signal receivers suitable for 5G technology.

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Section: Resultsmentioning

confidence: 99%

Au Nanosheets‐Assisted Structural Phase Transitions, In Situ Monitoring of the Enhanced Crystallinity, and Their Effect on the Optical and Dielectric Properties of CuSe/Au/CuSe Thin Films

Qasrawi

Baniowdah

Samen

2022

Crystal Research and Technology

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“…To solve this problem, a substrate-free design of FPA was proposed and fabricated, which is comprised sensing elements and frames. 8,9 And this structure was also realized by Oak Ridge National Laboratory. 10 Infrared imaging of a human body at room temperature was achieved in 2004 using this type of FPA with a unit size of 200 lm.…”

Section: Introductionmentioning

confidence: 99%

A holistic approach performance analysis of substrate-free focal plane array

Liang

Cheng

Chen

et al. 2012

Journal of Applied Physics

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Based on a bi-material micro-cantilever thermal deformation principle, an uncooled infrared focal plane array (FPA) with optical readout has been developed from a substrate-based structure to a substrate-free structure. Infrared imaging of the substrate-free FPA indicates that this structure does not satisfy temperature-constant substrate conditions when the FPA unit size decreases from 200 lm to 60 lm. To evaluate the performance of the FPA, this paper puts forward an analytical model of heat transfer in the substrate-free FPA, by using a holistic approach and an electrical circuit analogy. The analytical model provides a fast and convenient way to calculate the temperature gray response and the response time of the substrate-free FPA. A substrate-free FPA with a unit size of 50 lm was fabricated. Infrared imaging experiments validate the model and indicate a noise equivalent temperature difference value of 170 mK has been achieved.

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“…In this paper, a novel substrate-free single-layer bimaterial cantilever array used as the FPA in an IR imaging system with optical readout is presented, and an equivalent circuit model is applied to discussing the thermal response frequencies of the pixel in the FPA. Other performance, including the optical-mechanical sensitivity (detection) of the imaging system, is discussed in another paper [9]. The equivalent circuit model, compared with the differential equation method, has the merits of clear physical meaning and quick calculation.…”

Section: Introductionmentioning

confidence: 99%

“…calculated results and other performances[9,11] (cantilever temperature detection, thermal-mechanical sensitivity, optical detection sensitivity and dynamic range of imaging system) under the designed parameters are summarized in table 2.…”

mentioning

confidence: 99%

Circuit models applied to the design of a novel uncooled infrared focal plane array structure

Shi¹,

Chen²,

Li³

et al. 2007

Meas. Sci. Technol.

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This paper describes a circuit model applied to the simulation of the thermal response frequency of a novel substrate-free single-layer bi-material cantilever microstructure used as the focal plane array (FPA) in an uncooled opto-mechanical infrared imaging system. In order to obtain a high detection of the IR object, gold (Au) is coated alternately on the silicon nitride (SiNx) cantilevers of the pixels (Shi S et al Sensors and Actuators A at press), whereas the thermal response frequency decreases (Zhao Y 2002 Dissertation University of California, Berkeley). A circuit model for such a cantilever microstructure is proposed to be applied to evaluate the thermal response performance. The pixel's thermal frequency (1/τth) is calculated to be 10 Hz under the optimized design parameters, which is compatible with the response of optical readout systems and human eyes.

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Design, simulation and validation of a novel uncooled infrared focal plane array

Cited by 12 publications

References 6 publications

Au Nanosheets‐Assisted Structural Phase Transitions, In Situ Monitoring of the Enhanced Crystallinity, and Their Effect on the Optical and Dielectric Properties of CuSe/Au/CuSe Thin Films

Au Nanosheets‐Assisted Structural Phase Transitions, In Situ Monitoring of the Enhanced Crystallinity, and Their Effect on the Optical and Dielectric Properties of CuSe/Au/CuSe Thin Films

A holistic approach performance analysis of substrate-free focal plane array

Circuit models applied to the design of a novel uncooled infrared focal plane array structure

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