Bimodal Resonance Phenomen—Part III: High-Contrast Grating Reflectors

The extraordinary broadband high-reflectivity features of high-contrast gratings (HCGs) are stimulating great interest in many optoelectronic applications. In view of obtaining a simple simulation framework, the analogy of HCG reflectors with bimodal Fabry–Pérot interferometers is proposed. The clos...

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Published in:IEEE journal of quantum electronics 2018-01, Vol.54 (6), p.1
Main Authors: Tibaldi, Alberto, Debernardi, Pierluigi, Orta, Renato
Format: Article
Language:English
Subjects:
Broadband
Computer simulation
Design optimization
Interferometers
Mathematical models
Optoelectronics
Parameterization
Reflectance
Reflectors
Robustness (mathematics)
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Debernardi, Pierluigi
Orta, Renato
description The extraordinary broadband high-reflectivity features of high-contrast gratings (HCGs) are stimulating great interest in many optoelectronic applications. In view of obtaining a simple simulation framework, the analogy of HCG reflectors with bimodal Fabry–Pérot interferometers is proposed. The closed-form expressions of the interferometer reflectivity, obtained starting from a novel parametrization of the scattering matrices characterizing the bar–air interface, allow a complete exploration of the device parameter space, explaining and predicting the phenomenon of ultra-broadband quasi-100% reflectivity. In this paper, an optimized and numerically efficient design procedure is described and compared with the standard rigorous coupled wave analysis, both for the classical bar-in-air configuration and for a more robust and practical one, with bars lying on a dielectric support. It is shown that the model can be applied also in the more realistic case of lossy gratings.
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source IEEE Electronic Library (IEL) Journals
subjects Broadband
Computer simulation
Design optimization
Interferometers
Mathematical models
Optoelectronics
Parameterization
Reflectance
Reflectors
Robustness (mathematics)
title Bimodal Resonance Phenomen—Part III: High-Contrast Grating Reflectors
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