Nanoimprinted plasmonic nanocavity arrays

Sangsik Kim, Birck Nanotechnology Center, Purdue University
Yi Xuan, Birck Nanotechnology Center, Purdue University
Vladimir P. Drachev, Birck Nanotechnology Center, Purdue University; University of North Texas - Denton
Leo T. Varghese, Birck Nanotechnology Center, Purdue University
Li Fan, Birck Nanotechnology Center, Purdue University
Minghao Qi, Birck Nanotechnology Center, Purdue University
Kevin J. Webb, Birck Nanotechnology Center, Purdue University

Date of this Version

7-1-2013

Abstract

We demonstrate high resonant absorption of visible light with a plasmonic nanocavity chain structure fabricated through resistless nanoimprinting in metal (RNIM). The RNIM approach provides a simple, reproducible, and accurate means to fabricate metallic nanopatterns with high fidelity. The nanocavities are shown to be efficiently excited using normally incident light, and the resonant wavelength can be controlled by either the width or the depth of the cavity. Numerical simulations confirm the experimental observations, and illustrate the behavior of the nanocavity chain waveguide and insensitivity to incident angle. The resonant absorption is due to the excitation of a localized metal-insulator-metal cavity mode. The interacting surface waves allow cavity lengths on the order of ten nanometers for light having a free space wavelength of about four hundred nanometers. Coupling of the cavities with an intervening surface plasmon wave results in a collective excitation and a chain waveguide mode that should prove valuable for more sensitive detection based on surface enhanced Raman scattering. (C) 2013 Optical Society of America

Discipline(s)

Nanoscience and Nanotechnology

 

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