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Title: Photonic ring resonator filters for astronomical OH suppression

Journal Article · · Optics Express
 [1];  [2];  [3];  [2];  [2];  [2];  [2];  [4];  [4];  [4];  [5];  [5]
  1. Australian Astronomical Observatory, North Ryde, NSW (Australia); Univ. of Sydney, NSW (Australia)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Australian Astronomical Observatory, North Ryde, NSW (Australia)
  4. Northwestern Univ., Evanston, IL (United States)
  5. Univ. of Sydney, NSW (Australia)

Ring resonators provide a means of filtering specific wavelengths from a waveguide, and optionally dropping the filtered wavelengths into a second waveguide. Both of these features are potentially useful for astronomical instruments. In this paper we focus on their use as notch filters to remove the signal from atmospheric OH emission lines from astronomical spectra. We derive the design requirements for ring resonators for OH suppression from theory and finite difference time domain simulations. We find that rings with small radii (< 10 μm) are required to provide an adequate free spectral range, leading to high index contrast materials such as Si and Si3N4. Critically coupled rings with high self-coupling coefficients should provide the necessary Q factors, suppression depth, and throughput for efficient OH suppression, but will require post-inscription tuning of the coupling and the resonant wavelengths. The overall prospects for the use of ring resonators in astronomical instruments is promising, provided efficient fibre-chip coupling can be achieved.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Alfred P. Sloan Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1367889
Journal Information:
Optics Express, Journal Name: Optics Express Journal Issue: 14 Vol. 25; ISSN 1094-4087
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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