Tunable Visibly Transparent Optics Derived from Porous Silicon
Abstract
Visibly transparent porous silicon dioxide (PSiO2) and PSiO2/titanium dioxide (TiO2) optical elements were fabricated by thermal oxidation, or a combination of thermal oxidation and atomic layer deposition infilling, of an electrochemically etched porous silicon (PSi) structure containing an electrochemically defined porosity profile. The thermally oxidized PSiO2 structures are transparent at visible wavelengths and can be designed to have refractive indices ranging from 1.1 to 1.4. The refractive index can be increased above 2.0 through TiO2 infilling of the pores. Applying this oxidation and TiO2 infilling methodology enabled tuning of a distributed Bragg reflector (DBR) formed from PSi across the visible spectrum. At the maximum filling, the DBR exhibited a transmission of 2% at 620 nm. Simulations match well with measured spectra. In addition to forming DBR filters, phase-shaping gradient refractive index (GRIN) elements were formed. As a demonstration, a 4 mm diameter radial GRIN PSiO2 element with a parabolic, lens-like phase profile with a calculated focal length of 1.48 m was formed. The calculated focal length was reduced to 0.80 m upon the addition of TiO2. All the structures showed broad transparency in the visible and were stable to the materials conversion process.
- Authors:
-
- Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering, Frederick Seitz Materials Research Lab.
- The Dow Chemical Company, Freeport, TX (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1388287
- Grant/Contract Number:
- SC0001293
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- ACS Photonics
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 4; Related Information: LMI partners with California Institute of Technology (lead); Harvard University; University of Illinois, Urbana-Champaign; Lawrence Berkeley National Laboratory; Journal ID: ISSN 2330-4022
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; solar (photovoltaic); solid state lighting; phonons; thermal conductivity; electrodes - solar; materials and chemistry by design; optics; synthesis (novel materials); synthesis (self-assembly)
Citation Formats
Ocier, Christian R., Krueger, Neil A., Zhou, Weijun, and Braun, Paul V. Tunable Visibly Transparent Optics Derived from Porous Silicon. United States: N. p., 2017.
Web. doi:10.1021/acsphotonics.6b01001.
Ocier, Christian R., Krueger, Neil A., Zhou, Weijun, & Braun, Paul V. Tunable Visibly Transparent Optics Derived from Porous Silicon. United States. https://doi.org/10.1021/acsphotonics.6b01001
Ocier, Christian R., Krueger, Neil A., Zhou, Weijun, and Braun, Paul V. 2017.
"Tunable Visibly Transparent Optics Derived from Porous Silicon". United States. https://doi.org/10.1021/acsphotonics.6b01001. https://www.osti.gov/servlets/purl/1388287.
@article{osti_1388287,
title = {Tunable Visibly Transparent Optics Derived from Porous Silicon},
author = {Ocier, Christian R. and Krueger, Neil A. and Zhou, Weijun and Braun, Paul V.},
abstractNote = {Visibly transparent porous silicon dioxide (PSiO2) and PSiO2/titanium dioxide (TiO2) optical elements were fabricated by thermal oxidation, or a combination of thermal oxidation and atomic layer deposition infilling, of an electrochemically etched porous silicon (PSi) structure containing an electrochemically defined porosity profile. The thermally oxidized PSiO2 structures are transparent at visible wavelengths and can be designed to have refractive indices ranging from 1.1 to 1.4. The refractive index can be increased above 2.0 through TiO2 infilling of the pores. Applying this oxidation and TiO2 infilling methodology enabled tuning of a distributed Bragg reflector (DBR) formed from PSi across the visible spectrum. At the maximum filling, the DBR exhibited a transmission of 2% at 620 nm. Simulations match well with measured spectra. In addition to forming DBR filters, phase-shaping gradient refractive index (GRIN) elements were formed. As a demonstration, a 4 mm diameter radial GRIN PSiO2 element with a parabolic, lens-like phase profile with a calculated focal length of 1.48 m was formed. The calculated focal length was reduced to 0.80 m upon the addition of TiO2. All the structures showed broad transparency in the visible and were stable to the materials conversion process.},
doi = {10.1021/acsphotonics.6b01001},
url = {https://www.osti.gov/biblio/1388287},
journal = {ACS Photonics},
issn = {2330-4022},
number = 4,
volume = 4,
place = {United States},
year = {Tue Feb 28 00:00:00 EST 2017},
month = {Tue Feb 28 00:00:00 EST 2017}
}
Web of Science
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