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Light-controlled tuning of the optical properties of nanoporous glass

Varanakkottu, S. N. and Engelbart, H. and Joshi, S. and Still, M. and Xiao, W. and Hardt, Steffen (2014):
Light-controlled tuning of the optical properties of nanoporous glass.
In: Optics Express, pp. 25560-25569, 22, (21), ISSN 1094-4087,
[Online-Edition: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-21-2...],
[Article]

Abstract

Materials having tunable optical properties are of great interest for photonic applications. Promising candidates in that context are transparent nanoporous media whose optical properties change after infiltration of a liquid into the pores. Herein we present an all-optical method to tune the light scattering properties of a nanoporous glass based on the light-induced phase change of the fluid filling the pores. The thermodynamic state of the gas inside the nanopores determines the light scattering, thereby the light transmission. The extent of capillary condensation inside the nanoscale pores is controlled by heat generated from light absorption inside the medium. The material can be configured in such a way that a laser beam of sufficient intensity either opens up or shuts down its own light path on a time scale of a few seconds. The scattering events inside the medium change the beam profile from Gaussian to super-Gaussian with a more homogeneous intensity distribution close to the beam axis. Our results demonstrate a new way of tuning the light transmission properties of nanoporous materials that could find various applications in integrated optical systems and optofluidic devices.

© 2014 Optical Society of America

Item Type: Article
Erschienen: 2014
Creators: Varanakkottu, S. N. and Engelbart, H. and Joshi, S. and Still, M. and Xiao, W. and Hardt, Steffen
Title: Light-controlled tuning of the optical properties of nanoporous glass
Language: English
Abstract:

Materials having tunable optical properties are of great interest for photonic applications. Promising candidates in that context are transparent nanoporous media whose optical properties change after infiltration of a liquid into the pores. Herein we present an all-optical method to tune the light scattering properties of a nanoporous glass based on the light-induced phase change of the fluid filling the pores. The thermodynamic state of the gas inside the nanopores determines the light scattering, thereby the light transmission. The extent of capillary condensation inside the nanoscale pores is controlled by heat generated from light absorption inside the medium. The material can be configured in such a way that a laser beam of sufficient intensity either opens up or shuts down its own light path on a time scale of a few seconds. The scattering events inside the medium change the beam profile from Gaussian to super-Gaussian with a more homogeneous intensity distribution close to the beam axis. Our results demonstrate a new way of tuning the light transmission properties of nanoporous materials that could find various applications in integrated optical systems and optofluidic devices.

© 2014 Optical Society of America

Journal or Publication Title: Optics Express
Volume: 22
Number: 21
Divisions: 16 Department of Mechanical Engineering
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
16 Department of Mechanical Engineering > Institute for Nano- and Microfluidics (NMF)
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Date Deposited: 14 Oct 2014 12:26
Official URL: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-21-2...
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