A Massively Degenerate Coherent Perfect Absorber

Y. Slobodkin, G. Weinberg, H. H.rner, K. Pichler, S. Rotter, O. Katz

Research output: Contribution to journalConference articlepeer-review


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 languageAmerican English
Pages (from-to)636-637
Number of pages2
JournalInternational Conference on Metamaterials, Photonic Crystals and Plasmonics
StatePublished - 2023
Event13th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META 2023 - Paris, France
Duration: 18 Jul 202321 Jul 2023

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Materials Science (miscellaneous)
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry


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