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15 May 2007 Thermo-activated nano-material for use in optical devices
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Proceedings Volume 6589, Smart Sensors, Actuators, and MEMS III; 658909 (2007)
Event: Microtechnologies for the New Millennium, 2007, Maspalomas, Gran Canaria, Spain
In this paper we describe the use of thermo-activated PNIPAM nano-material in optical switching devices. In other publications, the PNIPAM is used either as a carrier for crystalline colloidal array self-assemblies or as micro-particles that serve as pigment bags. In this publication we use a simpler-to-fabricate pure PNIPAM solution in a semi-dilute regime. The PNIPAM devices produced are transparent at temperatures below a critical temperature of 32°C and become diffusing above this temperature. We show that at 632nm the transmission through the devices is about 75% in the transparent state while the additional attenuation achieved in the diffusing state is of the order of 38 dB. The experimental fall and rise times obtained are large (about 300ms and 5s respectively) due to the non-optimised thermal addressing scheme. In addition, spectral measurements taken in the infrared spectrum (700-1000nm) demonstrate that the cell response is flat over a large portion of the infrared spectrum in both the transparent and the diffusing states.
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Solon Mias, Jan Sudor, and Henri Camon "Thermo-activated nano-material for use in optical devices", Proc. SPIE 6589, Smart Sensors, Actuators, and MEMS III, 658909 (15 May 2007);


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