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Title: Group-velocity-dispersion engineering of tantala integrated photonics

Journal Article · · Optics Letters
DOI:https://doi.org/10.1364/OL.414095· OSTI ID:1765009

Designing integrated photonics, especially to leverage Kerr-nonlinear optics, requires accurate and precise knowledge of the refractive index across the visible to infrared spectral ranges. Tantala ( T a 2 O 5 ) is an emerging material platform for integrated photonics and nanophotonics that offers broadband ultralow loss, moderately high nonlinearity, and advantages for scalable and heterogeneous integration. We present refractive index measurements on a thin film of tantala, and we explore the efficacy of this data for group-velocity-dispersion (GVD) engineering with waveguide and ring-resonator devices. In particular, the observed spectral extent of supercontinuum generation in fabricated waveguides and the wavelength dependence of free spectral range (FSR) in optical resonators provide a sensitive test of our integrated photonics design process. Our work opens up new design possibilities with tantala, including with octave-spanning soliton microcombs.

Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0001042
OSTI ID:
1765009
Journal Information:
Optics Letters, Journal Name: Optics Letters Vol. 46 Journal Issue: 4; ISSN 0146-9592
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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