Plasmonic photoheating of gold nanorods in thermo-responsive chiral liquid crystals. (2nd November 2016)

• Record Type: Journal Article
• Authors: De Sio, Luciano; Placido, Tiziana; Comparelli, Roberto; Curri, Maria Lucia; Tabiryan, Nelson; Bunning, Timothy J
• Is Part Of: Journal of optics. Volume 18:Number 12(2016:Dec.)
• Publication Date: 2016-11-02
• Subjects: liquid crystals -- nanomaterials -- plasmonics -- optics; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8978/18/12/125005
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: We report on the thermo-optical properties of gold nanorods (GNRs) dispersed in a thermotropic cholesteric liquid crystal (CLC). We have characterized the CLC reflection band behavior for two different cell thicknesses under the influence of a suitable (resonant) pump beam. It turns out that for the 1.6 μ m thick cell there is a suppression of the CLC reflection band for both pure CLC and CLC/GNRs. For the 10 μ m thick cell, the presence of GNRs desensitizes the shift of the CLC reflection band to temperature. Suitable cell design enables one to 'turn off' the wavelength shift of the peak reflection, thereby turning the system into a pure amplitude measurement tool. This has implications where the probe wavelength is fixed at a common, single wavelength.