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

doi:10.1063/1.3592756

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

Electrical Engineering

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

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 (n_e - n_o) of the liquid crystal and the interparticle distance i.e., Δλ= (n_e - n_o) 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 language	English (US)
Article number	213101
Journal	Applied Physics Letters
Volume	98
Issue number	21
DOIs	https://doi.org/10.1063/1.3592756
State	Published - May 23 2011

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3592756

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

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.",

author = "Jia Li and Yi Ma and Ying Gu and Khoo, {Iam Choon} and Qihuang Gong",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China under Grant Nos. 10874004 and 10821062, and by the National Key Basic Research Program under Grant No. 2007CB307001. Work at Penn State is supported by U.S. National Science Foundation—Penn State Center for Nanoscale Science (MRSEC). ",

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doi = "10.1063/1.3592756",

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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

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China under Grant Nos. 10874004 and 10821062, and by the National Key Basic Research Program under Grant No. 2007CB307001. Work at Penn State is supported by U.S. National Science Foundation—Penn State Center for Nanoscale Science (MRSEC).

PY - 2011/5/23

Y1 - 2011/5/23

N2 - 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.

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

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