Controlling directional absorption with chiral exceptional surfaces

Q. Zhong, S. Nelson, K. Özdemir, R. El-Ganainy

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Significant efforts have been dedicated to engineering optical systems with predefined, excitation-dependent light absorption. An important concept along this line is that of exceptional points which allow for engineering directional light absorbing schemes. Current systems, however, do not lend themselves to easy design criterion or robust experimental realization. Here we demonstrate that an optical microring resonator coupled to a waveguide terminated with a mirror supports a chiral exceptional surface that can be used as a platform for tailoring directional light absorption in a straightforward fashion. We further demonstrate that this configuration can be used to implement a unidirectional coherent perfect absorber with controllable differential loss by tuning only a single parameter.

Original languageEnglish (US)
Pages (from-to)5242-5245
Number of pages4
JournalOptics Letters
Issue number21
StatePublished - Nov 1 2019

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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