Large spectral tunability of narrow geometric resonances of periodic arrays of metallic nanoparticles in a nematic liquid crystal

Jia Li, Yi Ma, Ying Gu, Iam-choon Khoo, Qihuang Gong

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We investigated the geometric resonances of periodic arrays of gold nanoparticles embedded in a nematic liquid crystal using a semi-analytical method. By changing the liquid crystal's refractive index seen by the scattered light propagating along the array axis, the geometric resonance can be modulated according to an analytical law. The spectral tunability is proportional to the index difference (ne - no) of the liquid crystal and the interparticle distance i.e., Δλ= (ne - no) d, which is as large as 100 nm. The large and easily controlled tunability of this compound structure makes it desirable for design of plasmon-based sensors and switches.

Original languageEnglish (US)
Article number213101
JournalApplied Physics Letters
Volume98
Issue number21
DOIs
StatePublished - May 23 2011

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liquid crystals
nanoparticles
switches
refractivity
gold
sensors

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "We investigated the geometric resonances of periodic arrays of gold nanoparticles embedded in a nematic liquid crystal using a semi-analytical method. By changing the liquid crystal's refractive index seen by the scattered light propagating along the array axis, the geometric resonance can be modulated according to an analytical law. The spectral tunability is proportional to the index difference (ne - no) of the liquid crystal and the interparticle distance i.e., Δλ= (ne - no) d, which is as large as 100 nm. The large and easily controlled tunability of this compound structure makes it desirable for design of plasmon-based sensors and switches.",
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Large spectral tunability of narrow geometric resonances of periodic arrays of metallic nanoparticles in a nematic liquid crystal. / Li, Jia; Ma, Yi; Gu, Ying; Khoo, Iam-choon; Gong, Qihuang.

In: Applied Physics Letters, Vol. 98, No. 21, 213101, 23.05.2011.

Research output: Contribution to journalArticle

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T1 - Large spectral tunability of narrow geometric resonances of periodic arrays of metallic nanoparticles in a nematic liquid crystal

AU - Li, Jia

AU - Ma, Yi

AU - Gu, Ying

AU - Khoo, Iam-choon

AU - Gong, Qihuang

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AB - We investigated the geometric resonances of periodic arrays of gold nanoparticles embedded in a nematic liquid crystal using a semi-analytical method. By changing the liquid crystal's refractive index seen by the scattered light propagating along the array axis, the geometric resonance can be modulated according to an analytical law. The spectral tunability is proportional to the index difference (ne - no) of the liquid crystal and the interparticle distance i.e., Δλ= (ne - no) d, which is as large as 100 nm. The large and easily controlled tunability of this compound structure makes it desirable for design of plasmon-based sensors and switches.

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