In the field of non-Hermitian photonics it is a well-established concept that a time-reversed laser acts as a “coherent perfect absorber” (CPA). However, CPAs are usually limited to a single, judiciously shaped wavefront (‘mode’). Here, we demonstrate how this limitation can be overcome by time-reversing a “degenerate cavity laser”, based on a cavity that self-images any incident light-field onto itself. Placing a weak, critically-coupled absorber into this cavity, ensures that any incoming wavefront is absorbed with close to perfect efficiency.
|Original language||American English|
|Number of pages||2|
|Journal||International Conference on Metamaterials, Photonic Crystals and Plasmonics|
|State||Published - 2023|
|Event||13th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META 2023 - Paris, France|
Duration: 18 Jul 2023 → 21 Jul 2023
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