Extraordinary optical transmission of ultra-thin freestanding plasmonic membranes

Abstract

We demonstrate an ultra-thin freestanding plasmonic membrane that supports surface plasmon resonances. The 30 nm-thick membrane is perforated with an array of holes using the imprint-and-transfer approach. The fabricated plasmonic membrane exhibits extraordinary optical transmissions in the mid-wave infrared wavelength range and can be used as an optical sensor to measure the absorption of a thin polymer film.