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arXiv · 1507.05712

Progress toward high-Q perfect absorption: A Fano antilaser

Sunkyu Yu·Xianji Piao·Jiho Hong·Namkyoo Park
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Abstract

Here we propose a route to the high-Q perfect absorption of light by introducing the concept of a Fano anti-laser. Based on the drastic spectral variation of the optical phase in a Fano-resonant system, a spectral singularity for scatter-free perfect absorption can be achieved with an order of magnitude smaller material loss. By applying temporal coupled mode theory to a Fano-resonant waveguide platform, we reveal that the required material loss and following absorption Q-factor are ultimately determined by the degree of Fano spectral asymmetry. The feasibility of the Fano anti-laser is confirmed using a photonic crystal platform, to demonstrate spatio-spectrally selective heating. Our results utilizing the phase-dependent control of device bandwidths derive a counterintuitive realization of high-Q perfect conversion of light into internal energy, and thus pave the way for a new regime of absorption-based devices, including switches, sensors, thermal imaging, and opto-thermal emitters.

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Sunkyu Yu, Xianji Piao, Jiho Hong, Namkyoo Park. 2015-07-21. Progress toward high-Q perfect absorption: A Fano antilaser. https://doi.org/10.1103/physreva.92.011802

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