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Title: Optically anisotropic porous silicon microlenses with tunable refractive indexes and birefringence profiles

Journal Article · · Optical Materials Express
DOI:https://doi.org/10.1364/OME.385013· OSTI ID:1602879

The effect of spatially varying birefringence on the focusing behavior of porous silicon (PSi) and porous silicon dioxide (PSiO2) gradient refractive index (GRIN) lenses is investigated. Both materials attain broad, tunable refractive indexes and birefringence profiles, with PSi having a maximum birefringence of ~0.26 and PSiO2 a reduced maximum birefringence of ~0.03 at 633 nm. These GRIN lenses exhibit polarization-dependent split focusing behavior, wherein the divergence angle between the twin foci increases with the birefringence gradient. PSi’s large birefringence allows the divergence angle to be tuned such that light focuses away from the center of the lens. These GRIN elements demonstrate how tunable birefringent materials can be used to engineer polarization-selective optical responses.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Photonics at Thermodynamic Limits (PTL); California Institute of Technology (CalTech), Pasadena, CA (United States); Stanford Univ., CA (United States); Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI-EFRC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001293; SC0019140
OSTI ID:
1602879
Alternate ID(s):
OSTI ID: 1767775
Journal Information:
Optical Materials Express, Journal Name: Optical Materials Express Vol. 10 Journal Issue: 4; ISSN 2159-3930
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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