Thermal crosstalk reduction in IR thermo-electric photodetectors by lock-in method: 4D numerical simulations and experimental verification

W. Vandermeiren; J. Stiens; C. De Tandt; G. Shkerdin; V. Kotov; G. Borghs; P. Muys; R. Vounckx

doi:10.1117/12.841556

25 February 2010 Thermal crosstalk reduction in IR thermo-electric photodetectors by lock-in method: 4D numerical simulations and experimental verification

W. Vandermeiren, J. Stiens, C. De Tandt, G. Shkerdin, V. Kotov, G. Borghs, P. Muys, R. Vounckx

Author Affiliations +

Proceedings Volume 7597, Physics and Simulation of Optoelectronic Devices XVIII; 75970Y (2010) https://doi.org/10.1117/12.841556
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

Laser induced temperature distributions inside doped semiconductor materials are used to derive laser beam profiles by means of the thermo-electric Seebeck effect. Thermal diffusion will lead to a discrepancy between the optical intensity profile of the laser beam and the measured temperature distribution inside the semiconductor. An advanced numerical 4D finite element model describing the laser induced spatial temperature distribution in function of time in a layered GaAs based structure was developed in Comsol Multiphysics. Non-linearities as the temperature dependence of the absorption coefficient, the thermal conductivity and the Seebeck coefficient were taken into account. This model was used to investigate the optical chopper frequency dependence on the spatial thermal cross-talk level and the responsivity near the illuminated surface of the detector structure. It was shown that the frequency dependent cross-talk level can be reduced significantly by applying short chopping periods due to the dependence of the thermal diffusion length on the frequency. The thermal cross-talk is reduced to -21 dB and -38.6 dB for the first and second neighboring pixel respectively for a lock-in frequency of 140 Hz. Experimental results of the spatial thermal cross-talk level and the responsivity were compared with simulations and satisfactory agreements between both were achieved. High power CO₂ laser profile measurements obtained with our thermo-electric detector and a commercially available Primes detector were compared.

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W. Vandermeiren, J. Stiens, C. De Tandt, G. Shkerdin, V. Kotov, G. Borghs, P. Muys, and R. Vounckx "Thermal crosstalk reduction in IR thermo-electric photodetectors by lock-in method: 4D numerical simulations and experimental verification", Proc. SPIE 7597, Physics and Simulation of Optoelectronic Devices XVIII, 75970Y (25 February 2010); https://doi.org/10.1117/12.841556

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KEYWORDS

Sensors

Gallium arsenide

Absorption

Finite element methods

Diffusion

Carbon dioxide lasers

Thermal modeling

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