Anomalous resonant reflection in a Fabry-Perot cavity filled with weakly scattering medium

Optics Letters
Ye HaoZhijun Sun

Abstract

In this work, we fabricated a metallic Fabry-Perot cavity, filled with a weakly scattering medium of unsintered solgel silica, on a glass substrate. We found anomalous asymmetric resonance reflection spectra of this structure, besides the effects of scattering loss in cavity. The asymmetric reflection is shown to be dependent on the media on both sides of the cavity. It is thought that, as the weakly scattering medium locates between highly reflecting boundaries and the cavity length is far less than the mean free path of light in the medium, light scattering in the medium is enhanced at the resonance conditions and the scattering centers act as elementary sources emitting the scattered incoherent light to the outside of the cavity from both its ends. The asymmetric reflection then results from lossy total internal reflection of the scattered light at one of the boundaries, eventually leaking to the outside of the cavity with the higher index and contributing to the measured backside reflectance.

References

Jan 15, 2000·Science·A L MoustakasS H Simon
Apr 22, 2003·Optics Letters·Lan Yang, K J Vahala
Mar 19, 2005·Physics in Medicine and Biology·A P GibsonS R Arridge
Jul 1, 2011·Optics Express·A Mendoza-GalvánH Arwin
Jul 20, 2012·ACS Nano·Mikael Svedendahl, Mikael Käll
Dec 25, 2015·Optics Express·Rajeshkumar MupparapuDiederik S Wiersma
Sep 20, 2016·International Journal of Modern Physics. B·Daniel J ParkVadim Backman

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