Research on Optical Properties of Tapered Optical Fibers with Liquid Crystal Cladding Doped with Gold Nanoparticles

Crystals

Bartosz Bartosewicz¹  Bartłomiej Jankiewicz¹  KarolA. Stasiewicz²  LeszekR. Jaroszewicz²  JoannaE. Moś²  Joanna Korec² 

[1] Institute of Optoelectronics Military University of Technology, 00-908 Warsaw, Poland;Institute of Technical Physics, Military University of Technology, 00-908 Warsaw, Poland;

关键词: liquid crystal;    gold nanoparticles;    optical fiber device;    tapered optical fiber;   

DOI  :  10.3390/cryst9060306

来源: DOAJ

【 摘 要 】

This paper presents results obtained for biconical tapered fibers surrounded/immersed in liquid crystal mixtures. The phenomenon of light propagating in the whole structure of a tapered fiber allows the creation of a sensor where the tapered region represents a core whereas the surrounding medium becomes a cladding. Created devices are very sensitive to changing refractive index value in a surrounding medium caused by modifying external environmental parameters like temperature, electric or magnetic field. For this reason, the properties of materials used as cladding should be easily modified. In this investigation, cells have been filled with two different nematic liquid crystals given as 1550* and 6CHBT (4-(trans-4-n-hexylcyclohexyl) isothiocyanatobenzoate), as well as with the same mixtures doped with 0.1 wt% gold nanoparticles (AuNPs). Optical spectrum analysis for the wavelength range of 550−1150 nm and time-courses performed for a wavelength of 846 nm at the temperature range of T = 25−40 °C were provided. For all investigations, a steering voltage in the range of 0−200 V which allows establishing the dopes’ influence on transmitted power and time response at different temperatures was applied.

【 授权许可】

Unknown