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Title: Photonic ring resonator filters for astronomical OH suppression

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 Si 3N 4. 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.
Authors:
 [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)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 14; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
Alfred P. Sloan Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1367889

Ellis, S. C., Kuhlmann, S., Kuehn, K., Spinka, H., Underwood, D., Gupta, R. R., Ocola, L., Liu, P., Wei, G., Stern, N. P., Bland-Hawthorn, J., and Tuthill, P.. Photonic ring resonator filters for astronomical OH suppression. United States: N. p., Web. doi:10.1364/OE.25.015868.
Ellis, S. C., Kuhlmann, S., Kuehn, K., Spinka, H., Underwood, D., Gupta, R. R., Ocola, L., Liu, P., Wei, G., Stern, N. P., Bland-Hawthorn, J., & Tuthill, P.. Photonic ring resonator filters for astronomical OH suppression. United States. doi:10.1364/OE.25.015868.
Ellis, S. C., Kuhlmann, S., Kuehn, K., Spinka, H., Underwood, D., Gupta, R. R., Ocola, L., Liu, P., Wei, G., Stern, N. P., Bland-Hawthorn, J., and Tuthill, P.. 2017. "Photonic ring resonator filters for astronomical OH suppression". United States. doi:10.1364/OE.25.015868. https://www.osti.gov/servlets/purl/1367889.
@article{osti_1367889,
title = {Photonic ring resonator filters for astronomical OH suppression},
author = {Ellis, S. C. and Kuhlmann, S. and Kuehn, K. and Spinka, H. and Underwood, D. and Gupta, R. R. and Ocola, L. and Liu, P. and Wei, G. and Stern, N. P. and Bland-Hawthorn, J. and Tuthill, P.},
abstractNote = {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.},
doi = {10.1364/OE.25.015868},
journal = {Optics Express},
number = 14,
volume = 25,
place = {United States},
year = {2017},
month = {1}
}