@article{a3d6b64345aa41d8a93ed04806a2bbd0,
title = "Photonic ring resonator filters for astronomical OH suppression",
abstract = "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.",
author = "Ellis, {S. C.} and S. Kuhlmann and K. Kuehn and H. Spinka and D. Underwood and Gupta, {R. R.} and Ocola, {L. E.} and P. Liu and G. Wei and Stern, {N. P.} and J. Bland-Hawthorn and P. Tuthill",
note = "Funding Information: U.S. Department of Energy, Office of Science, and Office of Basic Sciences contract DE-AC02-06CH11357 and Award DE-SC0012130. Alfred P. Sloan Foundation. Many thanks to Martin Ams, Ben Johnston, Alex Stokes, and Graham Smith for their invaluable help in the laboratory testing of our devices. We are also very grateful for the help of our AAO vacation students: R. Nash, J. St. Antoine, J. Lorenzo Redondo, J. Kepple, and A. Crouzier. Many thanks to Jon Lawrence and Sergio Le{\'o}n-Saval for useful discussions. We wish to thank the staff at the Argonne Center for Nanoscale Materials, whose contributions made the ring resonator fabrication possible. This includes co-author Leo Ocola, Dave Czaplewski, Ralu Divan, Suzanne Miller, and Valentina Kutepova. Argonne students have been crucial for our device testing program: Danny Davies, James DerKacy, Ariel Matalon, Alexis Miranda, Kasia Pomian, and Joe Pastore. We wish to thank Tom Kasprzyk for his technical help with the Argonne test-stand. This work was performed in-part at the OptoFab node of the Australian National Fabrication Facility, utilising NCRIS and NSW state government funding. We thank two anonymous referees whose comments helped improve this paper. Publisher Copyright: {\textcopyright} 2017 Optical Society of America.",
year = "2017",
month = jul,
day = "10",
doi = "10.1364/OE.25.015868",
language = "English (US)",
volume = "25",
pages = "15868--15889",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "14",
}