Fourier transform plasmon resonance spectrometer using nanoslit-nanowire pair

In this paper, we present a nanoscale Fourier transform spectrometer using a plasmonic interferometer consisting of a tilt subwavelength slit-nanowire pair on a metallic surface fabricated by the focused ion beam microfabrication technique. The incident broadband light strongly couples with the surf...

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Bibliographic Details
Published in:Applied physics letters 2019-06, Vol.114 (25)
Main Authors: Uulu, Doolos Aibek, Ashirov, Timur, Polat, Nahit, Yakar, Ozan, Balci, Sinan, Kocabas, Coskun
Format: Article
Language:English
Subjects:
Applied physics
Broadband
Far fields
Fast Fourier transformations
Fourier transform spectrometers
Fourier transforms
Gold
Incident light
Interference fringes
Ion beams
Nanowires
Optical components
Plasmons
Polaritons
Wave propagation
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Summary:In this paper, we present a nanoscale Fourier transform spectrometer using a plasmonic interferometer consisting of a tilt subwavelength slit-nanowire pair on a metallic surface fabricated by the focused ion beam microfabrication technique. The incident broadband light strongly couples with the surface plasmons on the gold surface, and thus, surface plasmon polaritons (SPPs) are generated. The launched SPPs interfere with the incident light and generate high contrast interference fringes in the nanoslit. The transmitted SPPs through the metal nanoslit can decouple into free space and are collected by an objective in the far field. The spectroscopic information of the incidence light is obtained by fast Fourier transform of the fringe pattern of the SPPs. In our design, there is no need for a bulky dispersive spectrometer or dispersive optical elements. The dimension of the spectrometer is around 200 μm length. Our design is based on inherent coherence of the SPP waves propagating through the subwavelength metal nanoslit structures etched into an opaque gold film.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5092517