Enhanced spectral sensitivity of a chip-scale photonic-crystal slow-light interferometer

Omar S. Magaña-Loaiza, Boshen Gao, Sebastian A. Schulz, Kashif M. Awan, Jeremy Upham, Ksenia Dolgaleva, Robert W. Boyd

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We experimentally demonstrate that the spectral sensitivity of a Mach–Zehnder (MZ) interferometer can be enhanced through structural slow light. We observe a 20-fold resolution enhancement by placing a dispersion-engineered, slow-light, photonic-crystal waveguide in one arm of a fiber-based MZ interferometer. The spectral sensitivity of the interferometer increases roughly linearly with the group index, and we have quantified the resolution in terms of the spectral density of interference fringes. These results show promise for the use of slow-light methods for developing novel tools for optical metrology and, specifically, for compact high-resolution spectrometers.
Original languageEnglish
Pages (from-to)1431-1434
JournalOptics Letters
Issue number7
Early online date21 Mar 2016
Publication statusPublished - 1 Apr 2018


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