Super-Resonant Intracavity Coherent Absorption

Year: 2016

Authors: Malara P., Campanella C. E., Giorgini A., Avino S., De Natale P., Gagliardi G.

Autors Affiliation: INO, Consiglio Nazl Ric, Via Campi Flegrei,34,Comprensorio A Olivetti, Pozzuoli, NA, Italy; QOpSys Srls, Via Matteotti,23,Gioia Colle, Bari, Italy; INO, Consiglio Nazl Ric, Largo E Fermi 6, Florence, Italy.

Abstract: 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.

Journal/Review: SCIENTIFIC REPORTS

Volume: 6      Pages from: 28947-1  to: 28947-7

KeyWords: Infrared spectroscopy; Optical physics; Optical sensors
DOI: 10.1038/srep28947

Citations: 10
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