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

Christian R. Ocier; Corey A. Richards; Daniel A. Bacon-Brown; Neil A. Krueger; Matthew K. Clawson; Julio A.N.T. Soares; Paul V. Braun

doi:10.1364/OME.385013

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

Christian R. Ocier, Corey A. Richards, Daniel A. Bacon-Brown, Neil A. Krueger, Matthew K. Clawson, Julio A.N.T. Soares, Paul V. Braun

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English (US)
Article number	5013
Pages (from-to)	868-883
Number of pages	16
Journal	Optical Materials Express
Volume	10
Issue number	4
DOIs	https://doi.org/10.1364/OME.385013
State	Published - Apr 1 2020
Externally published	Yes

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Electronic, Optical and Magnetic Materials

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10.1364/OME.385013

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title = "Optically anisotropic porous silicon microlenses with tunable refractive indexes and birefringence profiles",

abstract = "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.",

author = "Ocier, {Christian R.} and Richards, {Corey A.} and Bacon-Brown, {Daniel A.} and Krueger, {Neil A.} and Clawson, {Matthew K.} and Soares, {Julio A.N.T.} and Braun, {Paul V.}",

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AU - Ocier, Christian R.

AU - Richards, Corey A.

AU - Bacon-Brown, Daniel A.

AU - Krueger, Neil A.

AU - Clawson, Matthew K.

AU - Soares, Julio A.N.T.

AU - Braun, Paul V.

PY - 2020/4/1

Y1 - 2020/4/1

N2 - 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.

AB - 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.

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

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