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Conference on Lasers and Electro-Optics

Observation of Coherent Perfect Absorption in Resonant Organic Materials

Ali K. Jahromi, Lorelle N. Pye, Soroush Shabahang, Massimo L. Villinger, Joshua Perlstein, Ayman F. Abouraddy

Published Jan 1, 2018• 0 citations
Publisher

Abstract

By judiciously devising mirror reflectivities of a cavity containing an absorber, we experimentally demonstrate coherent perfect absorption in a resonant organic dye, even though the material’s intrinsic absorption significantly varies across the dye absorption bandwidth.
DOI
10.1364/cleo_at.2018.ath3p.6

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The capability of optical resonators to extend the effective radiation-matter interaction length originates from a multipass effect, hence is intrinsically limited by the resonator's quality factor. Here, we show that this constraint can be overcome by combining the concepts of resonant interaction and coherent perfect absorption (CPA). We demonstrate and investigate super-resonant coherent absorption in a coupled Fabry-Perot (FP)/ring cavity structure. At the FP resonant wavelengths, the described phenomenon gives rise to split modes with a nearly-transparent peak and a peak whose transmission is exceptionally sensitive to the intracavity loss. For small losses, the effective interaction pathlength of these modes is proportional respectively to the ratio and the product of the individual finesse coefficients of the two resonators. The results presented extend the conventional definition of resonant absorption and point to a way of circumventing the technological limitations of ultrahigh-quality resonators in spectroscopy and optical sensing schemes.