Fabrication of Plasmonic Nanoslit Surrounded with Hourglass Structure

Abstract

Horn structure has been utilized to enhance the sound wave intensity via various hour Glass type structures fro ancient ages such as Viking ages. In this report, Previously we reported the optical enhancement from the nanometer size circular aperture via hour glass type nanostructure. We will discuss the optical horn effect from microfabricated hourglass type nanoslits. In this report, the naoslit nanostructures are fabricated via conventional Si technology, and its optical characterizations are carried out using ND YAG 532 nm laser along with Nikon Ti Halogen lamp equipped with Princeton Spectrophotometer. The huge optical enhancement from the fabricated nanoslit with its ranging from ~ 1 nm to 30 nm will be reported and discussed. In addition, the plasmonic nanoslit array was fabricated on Au thin film with each slit of a ~ 10 nm width and a 300 nm length, and its optical characterization will be reported.