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Nanostructured Antireflection Coatings for Optical Detection and Sensing Applications

  • Gopal G. Pethuraja (a1) (a2), Roger E. Welser (a1), John W. Zeller (a1), Yash R. Puri (a1), Ashok K. Sood (a1), Harry Efstathiadis (a2), Pradeep Haldar (a2), Nibir K. Dhar (a3) and Priyalal Wijewarnasuriya (a4)...

Abstract

Optical components such as lenses, glass windows, and prisms are subject to Fresnel reflection due to the mismatch between the refractive indices of the air and glass. An optical interface layer, i.e., antireflection (AR) layer, is needed to eliminate this unwanted reflection at the air/glass interface. Nanostructured broadband and wide-angle AR structures have been developed using a scalable self-assembly process. Ultra-high performance of the nanostructured AR coatings has been demonstrated on various substrates such as quartz, sapphire, polymer, and other materials typically employed in optical lenses. AR coatings on polycarbonate lead to optical transmittance enhancement from approximately 90% to almost 100% for the entire visible, and part of the near-infrared (NIR), band. The AR coatings have also been demonstrated on curved surfaces. AR coatings on n-BK7 lenses enable ultra-high light transmittance for the entire visible, and most of the NIR, spectrum. Nanostructured oxide layers with step-graded index profiles, deposited onto the optical elements of an optical system, can significantly increase sensitivity, and hence improve the overall performance of the system.

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[1] Sood, A. K., Sood, A. W., Welser, R. E., Pethuraja, G. G., Puri, Y. R., Yan, X., Poxson, D. J., Cho, J., Schubert, E. F., Dhar, N. K., Polla, D. L., Haldar, P., and Harvey, J. L., “Development of Nanostructured Antireflection Coatings for EO/IR Sensor and Solar Cell Applications,” Mater. Sci. Appl. VO - 03, no. 09, p. 633, 2012.
[2] Xi, J.-Q., Schubert, M. F., Kim, J. K., Schubert, E. F., Chen, M., Lin, S.-Y., Liu, W., and Smart, J. A., “Optical thin-film materials with low refractive index for broadband elimination of Fresnel reflection,” Nat. Photonics, vol. 1, no. 3, pp. 176179, Mar. 2007.
[3] Poxson, D. J., Mont, F. W., Schubert, M. F., Kim, J. K., and Schubert, E. F., “Quantification of porosity and deposition rate of nanoporous films grown by oblique-angle deposition,” Appl. Phys. Lett., vol. 93, no. 10, p. 101914, 2008.
[4] Welser, R. E., Sood, A. W., Sood, A. K., Poxson, D. J., Chhajed, S., Cho, J., Schubert, E. F., Polla, D. L., and Dhar, N. K., “Ultra-high transmittance through nanostructure-coated glass for solar cell applications,” in Proc. of SPIE, 2011, vol. 8035, p. 80350X.10.1117/12.888129
[5] Welser, R. E., Sood, A. W., Pethuraja, G. G., Sood, A. K., Yan, X., Poxson, D. J., Cho, J., Fred Schubert, E., and Harvey, J. L., “Broadband nanostructured antireflection coating on glass for photovoltaic applications,” Photovoltaic Specialists Conference (PVSC), 2012 38th IEEE. pp. 33393342, 2012.10.1109/PVSC.2012.6318288
[6] Pethuraja, G. G., Sood, A., Welser, R., Sood, A. K., Efstathiadis, H., Haldar, P., and Harvey, J. L., “Large-area nanostructured self-assembled antireflection coatings for photovoltaic devices,” Photovoltaic Specialists Conference (PVSC), 2013 IEEE 39th. pp. 99102, 2013.
[7] Sood, A. K., Pethuraja, G., Sood, A. W., Welser, R. E., Puri, Y. R., Cho, J., Schubert, E. F., Dhar, N. K., Wijewarnasuriya, P., and Soprano, M. B., “Development of large area nanostructure antireflection coatings for EO/IR sensor applications,” in Proc. SPIE 8512, Infrared Sensors, Devices, and Applications II, 2012, vol. 8512, p. 85120R.
[8] Chhajed, S., Poxson, D. J., Yan, X., Cho, J., Schubert, E. F., Welser, R. E., Sood, A. K., and Kim, J. K., “Nanostructured multilayer tailored-refractive-index antireflection coating for glass with broadband and omnidirectional characteristics,” Applied Physics Express, vol. 4, no. 5. p. 052503, 2011.

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Nanostructured Antireflection Coatings for Optical Detection and Sensing Applications

  • Gopal G. Pethuraja (a1) (a2), Roger E. Welser (a1), John W. Zeller (a1), Yash R. Puri (a1), Ashok K. Sood (a1), Harry Efstathiadis (a2), Pradeep Haldar (a2), Nibir K. Dhar (a3) and Priyalal Wijewarnasuriya (a4)...

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