3.8 Proceedings Paper

Principles of leaky-mode photonic lattices: Band flips and Bloch mode dynamics

出版社

SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2508984

关键词

guided-mode resonance effect; leaky-mode resonance; resonant waveguide gratings; metamaterials; Bloch modes; wave propagation in periodic media; leaky-band dynamics

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资金

  1. UT System Texas Nanoelectronics Research Superiority Award - State of Texas Emerging Technology Fund
  2. Texas Instruments Distinguished University Chair in Nanoelectronics endowment
  3. National Science Foundation (NSF) [ECCS-1606898, ECCS-1809143]

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We present principles of leaky-mode photonic lattices explaining key properties enabling potential device applications. The one-dimensional grating-type canonical model is rich in properties and conceptually transparent encompassing all essential attributes applicable to two-dimensional metasurfaces and periodic photonic slabs. We address the operative physical mechanisms grounded in lateral leaky Bloch mode resonance emphasizing the significant influence imparted by the periodicity and the waveguide characteristics of the lattice. The effects discussed are not explainable in terms of local Fabry-Perot or Mie resonances. In particular, herein, we summarize the band dynamics of the leaky stopband revealing principal Bragg diffraction processes responsible for band-gap size and band closure conditions. We review Bloch wave vector control of spectral characteristics in terms of distinct evanescent diffraction channels driving designated Bloch modes in the lattice.

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