Affiliation:
1. Applied Physics Department, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
2. Institute for Theoretical Physics, Vienna University of Technology (TU Wien), 1040 Vienna, Austria.
Abstract
One of the key insights of non-Hermitian photonics is that well-established concepts such as the laser can be operated in reverse to realize a coherent perfect absorber (CPA). Although conceptually appealing, such CPAs are limited so far to a single, judiciously shaped wavefront or mode. Here, we demonstrate how this limitation can be overcome by time-reversing a degenerate cavity laser based on a unique cavity that self-images any incident light field onto itself. Placing a weak, critically coupled absorber into this cavity, any incoming wavefront, even a complex and dynamically varying speckle pattern, is absorbed with close to perfect efficiency in a massively parallel interference process. These characteristics open up interesting new possibilities for applications in light harvesting, energy delivery, light control, and imaging.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
24 articles.
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