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Research Papers

Mechanically Tuning the Localized Surface Plasmon Resonances of Gold Nanostructure Arrays

[+] Author and Article Information
Yanhui Zhao

Department of Engineering Science and Mechanics,  The Pennsylvania State University, University Park, PA 16802yzz127@psu.edu

Thomas Walker

Department of Engineering Science and Mechanics,  The Pennsylvania State University, University Park, PA 16802stesichorus@gmail.com

Yue Bing Zheng

Department of Engineering Science and Mechanics,  The Pennsylvania State University, University Park, PA 16802yzz113@gmail.com

Sz-Chin Steven Lin

Department of Engineering Science and Mechanics,  The Pennsylvania State University, University Park, PA 16802ssl130@psu.edu

Ahmad Ahsan Nawaz

Department of Engineering Science and Mechanics,  The Pennsylvania State University, University Park, PA 16802aan141@psu.edu

Brian Kiraly

Department of Engineering Science and Mechanics,  The Pennsylvania State University, University Park, PA 16802btk5051@psu.edu

Jason Scott

Department of Engineering Science and Mechanics,  The Pennsylvania State University, University Park, PA 16802jms6824@psu.edu

Tony Jun Huang

Department of Engineering Science and Mechanics,  The Pennsylvania State University, University Park, PA 16802junhuang@psu.edu

J. Nanotechnol. Eng. Med 3(1), 011007 (Aug 14, 2012) (5 pages) doi:10.1115/1.4006616 History: Received September 16, 2011; Revised February 08, 2012; Published August 13, 2012; Online August 14, 2012

We report the fabrication of metal nanostructures on a polydimethylsiloxane (PDMS) substrate by transferring polystyrene beads onto PDMS substrate followed by metal deposition. Experimentally tuning the plasmon resonance of the metal nanostructures was demonstrated by stretching the patterned PDMS substrate. The distance between adjacent nanodisks affects the coupling between the disks, leading to a repeatable and reversible shift in the spectrum. The device can be valuable in many applications such as bio/chemical sensing, reconfigurable optics, and the study of coupled resonances.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the experimental setup. The active tuning of LSPR of the Au nanodisk arrays is achieved by mechanically stretching the sample.

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Figure 2

Procedures of fabricating Au nanostructure arrays on a PDMS substrate using the Langmuir–Blodgett technique, deposition, and etching. (a) Disperse PS nanospheres in DI water. (b) Compress the squeeze bars to form a compact monolayer of PS nanospheres. (c) Attach a smooth PDMS substrate to the monolayer of nanospheres. (d) The bonding force between PS nanospheres and PDMS substrate helps to transfer the nanosphere arrays onto the surface of PDMS substrate. (e) Reshape nanospheres using plasma etching. (f) Deposit Cr/Au on top of the nanosphere arrays. SEM images of the sample after step (e) and (f) are shown in (g) and (h), respectively.

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Figure 3

(a) Microscopic image of Au nanodisk array immobilized on a PDMS substrate. Three axes of the hexagonal array are marked for measuring the geometry change upon stretching. (b)–(d) The measured change in array period along three axes.

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Figure 4

(a) Measured and (b) FDTD-simulated LSPR reflectance spectrum of the Au nanodisk arrays immobilized on a PDMS substrate in relaxed state

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Figure 5

(a) Extinction spectra recorded from the Au nanodisk arrays immobilized on a PDMS substrate undergoing various levels of stretching. A blueshift of reflectance peak wavelength is observed. (b) Shift of reflectance peak wavelength as a function of amount of stretch. A tunable reflectance peak shift up to 30 nm is achieved.

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