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Title: Integrated polarization-free Bragg filters with subwavelength gratings for photonic sensing

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.504043· OSTI ID:2279107

We present polarization-free Bragg filters having subwavelength gratings (SWGs) in the lateral cladding region. This Bragg design expands modal fields toward upper cladding, resulting in enhanced light interaction with sensing analytes. Two device configurations are proposed and examined, one with index-matched coupling between transverse electric (TE) and transverse magnetic (TM) modes and the other one with hybrid-mode (HM) coupling. Both configurations introduce a strong coupling between two orthogonal modes (either TE-TM or HM 1 -HM 2 ) and rotate the polarization of the input wave through Bragg reflection. The arrangements of SWGs help to achieve two configurations with different orthogonal modes, while expanding modal profiles toward the upper cladding region. Our proposed SWG-assisted Bragg gratings with polarization independency eliminate the need for a polarization controller and effectively tailor the modal properties, enhancing the potential of integrated photonic sensing applications.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NA-0003525
OSTI ID:
2279107
Journal Information:
Optics Express, Journal Name: Optics Express Vol. 32 Journal Issue: 2; ISSN 1094-4087
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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