Irreversible redshift of transmission spectrum of gold nanoparticles doped in liquid crystals

Li Hsuan Hsu, Kuang Yao Lo, Shih An Huang, Chi Yen Huang, Chung Sung Yang

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Abstract

The absorption peak of gold (Au) nanoparticles doped in liquid crystal (ANDLC) is controllable by applying an external applied voltage before aggregation occurs. Au nanoparticles aggregate when the dielectrophoresis force, which is induced by the gradient of the square of the electric filed close to the sides of the host liquid crystal cell, overcomes the viscosity between Au nanoparticles and the LCs. This result leads to the irreversible redshift. A controllable filter with unpolarized light enables an ANDLC cell under the threshold voltage to prevent the aggregation effect.

Original languageEnglish
Article number181112
JournalApplied Physics Letters
Volume92
Issue number18
DOIs
Publication statusPublished - 2008 May 16

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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