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Widely tunable monolithic narrowband grating filter for near-infrared radiation

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Abstract

We propose a monolithic narrowband guided-mode grating filter in fused silica that is widely tunable in the near-IR wavelength region. Based on a recently demonstrated approach for a monolithic reflector comprising an encapsulated grating, we theoretically investigate such a device by means of rigorous modeling aimed at a narrow linewidth. It is demonstrated that upon a spatial variation of the filter’s grating period its resonance wavelength can be tuned in a remarkably wide range of near-IR radiation with 800nm<λres<1600nm by translating the laser beam relative to the grating area. The filter performance in terms of linewidth and contrast is essentially preserved over the entire tuning interval.

© 2011 Optical Society of America

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