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Transparent Perfect Mirror
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DOI：10.1021/acsphotonics.7b00052.png)
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Abstract
En 中文
A mirror that reflects light fully and yet is transparent appears paradoxical. Current so-called transparent or one-way mirrors are not perfectly reflective and thus can be distinguished from a standard mirror. Constructing a transparent perfect mirror has profound implications for security, privacy, and camouflage. However, such a hypothetical device cannot be implemented in a passive structure. We demonstrate here a transparent perfect mirror in a non Hermitian configuration: an active optical cavity where a certain prelasing gain extinguishes Poynting's vector at the device entrance. At this threshold, all vestiges of the cavity's structural resonances are eliminated and the device presents spectrally flat unity-reflectivity, thus, becoming indistinguishable from a perfect mirror when probed optically across the gain bandwidth. Nevertheless, the device is rendered transparent by virtue of persisting amplified transmission resonances. We confirm these predictions in two photonic realizations: a compact integrated active waveguide and a macroscopic all-optical-fiber system.
Keywords:
optical gain
non-Hermitian photonics
semiconductor optical amplifier
Fabry-Perot cavity
multiple quantum well
Poynting's vector
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