Effect of finite pixel size on optical coupling in QWIPs
Autor: | Alfredo De Rossi, Sylvain Rommeluère, Eric Costard, Nicolas Guérineau |
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Rok vydání: | 2003 |
Předmět: |
Diffraction
Physics Pixel Physics::Instrumentation and Detectors business.industry Detector Physics::Optics Photodetector Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Optics Cardinal point Optoelectronics Infrared detector Image sensor business Quantum well |
Zdroj: | Infrared Physics & Technology. 44:325-330 |
ISSN: | 1350-4495 |
Popis: | We study the optical coupling in quantum well photodetectors, focusing on finite size effects. We introduced a finite-element model of the detector and we show experimentally that the optical coupling efficiency is strongly dependent on the pixel size and that in very small detectors diffraction dominates the grating coupling. A 640 × 512 QWIP focal plane array was characterized to show that the optical response of thinned samples may depend on the substrate thickness noticeably. These results are in much closer agreement with predictions obtained with our model than using standard techniques. |
Databáze: | OpenAIRE |
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