Analytical Model For Coherent Perfect Absorption In One-Dimensional Photonic Structures

Abstract

Coherent perfect absorption (CPA) is the phenomenon where a linear system with low intrinsic loss strongly absorbs two incident beams but only weakly absorbs either beam when incident separately. We present an analytical model that captures the relevant physics of CPA in one-dimensional photonic structures. This model elucidates an absorption-mediated interference effect that underlies CPA - an effect that is normally forbidden in Hermitian systems but is allowed when conservation of energy is violated due to the inclusion of loss. By studying a planar cavity model, we identify the optimal mirror reflectivity to guarantee CPA in the cavity at resonances extending in principle over any desired bandwidth. As a concrete example, we design a resonator that produces CPA in a 1-μm-thick layer of silicon over a 200-nm bandwidth in the near-infrared.

Publication Date

12-1-2015

Publication Title

Optics Letters

Volume

40

Issue

23

Number of Pages

5550-5553

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OL.40.005550

Socpus ID

84959440750 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84959440750

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