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Title: High-spectral-contrast symmetric modes in photonic crystal dual nanobeam resonators

Here, we demonstrate accurate control of mode symmetry in suspended dual-nanobeam resonators on a silicon-on-insulator chip. Each nanobeam consists of a Fabry-Perot nanocavity bounded by tapered 1-D photonic crystals. Even and odd cavity-modes are formed due to lateral evanescent coupling between the two nanobeams. The odd cavity-mode can be excited by mode-symmetry-transforming Mach-Zehnder couplers. Modal contrasts over 27 dB are measured in fabricated structures. The influence of the optical field in the middle air slot on the background transmission and quality factors is discussed. The observed peak wavelength separations of the modes at various nanobeam spacings are in good agreement with simulation results. These nanobeam resonators are potentially useful in applications, such as ultrafast all-optical modulation, filtering, and switching.
ORCiD logo [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [1]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Univ. of Massachusetts, Boston, MA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 1041-1135; R&D Project: 16062; 16062; KC0403020
Grant/Contract Number:
Accepted Manuscript
Journal Name:
IEEE Photonics Technology Letters
Additional Journal Information:
Journal Volume: 28; Journal Issue: 20; Journal ID: ISSN 1041-1135
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; optical resonators; cavity resonators; optical switches; Q-factor; optical filters; filtering; photonics; Center for Functional Nanomaterials; integrated optics devices; photonic crystals; silicon photonics; wavelength filtering devices; coupled resonators; all-optical devices; optical switching devices; guided waves
OSTI Identifier: