Super-Resonant Intracavity Coherent Absorption
Authors: Malara P., Campanella C. E., Giorgini A., Avino S., De Natale P., Gagliardi G.
Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34, Comprensorio A. Olivetti, Pozzuoli, NA, Italy; QOpSys Srls, Via Matteotti,23,Gioia Colle, Bari, Italy; Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), 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 sensorsDOI: 10.1038/srep28947Citations: 9data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-07-18References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here