Non-Hermitian heterostructure for two-parameter sensing

Jieun Yim, Han Zhao, Bikashkali Midya, Liang Feng

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Non-Hermitian systems at exceptional point (EP) degeneracy are demonstrated to be highly sensitive to environmental perturbation. Here, we propose and theoretically investigate a novel multilayered heterostructure favoring double EPs for a unique set of material parameters at which forward- and backward-reflection coefficients vanish, respectively. Such an EP heterostructure is shown to scatter off light when system parameters are perturbed away from the degeneracies due to the effect of ambient temperature and mechanical stress fluctuations. The proposed structure is conducive to manipulating optical responses for two mutually independent parameters sensing.
Original languageEnglish (US)
Pages (from-to)1626
JournalOptics Letters
Issue number7
StatePublished - Mar 21 2019
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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