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 journalArticlepeer-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 languageEnglish (US)
Article number5013
Pages (from-to)868-883
Number of pages16
JournalOptical Materials Express
Volume10
Issue number4
DOIs
StatePublished - Apr 1 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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