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Nanoscale Single-Element Color Filters

Title
Nanoscale Single-Element Color Filters
Authors
Hyun, Jerome K.Kang, TaeheeBaek, HyeonjunKim, Dai-sikYi, Gyu-chul
Ewha Authors
현가담
SCOPUS Author ID
현가담scopus
Issue Date
2015
Journal Title
NANO LETTERS
ISSN
1530-6984JCR Link1530-6992JCR Link
Citation
vol. 15, no. 9, pp. 5938 - 5943
Keywords
color filterZnOoptical filternanoscale filter
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Visible-light filters constructed from nanostructured materials typically consist of a metallic grating and rely on the excitation of surface plasmon polaritons (SPPs). In order to operate at full efficiency, the number of grating elements needs to be maximized such that light can couple more efficiently to the SPPs through improved diffraction. Such conditions impose a limitation on the compactness of the filter since a larger number of grating elements represents a larger effective size. For emerging applications involving nanoscale transmitters or receivers, a device that can filter localized excitations is highly anticipated but is challenging to realize through grating-type filters. In this work, we present the design of an optical filter operating with a single element, marking a departure from diffractive plasmonic coupling. Our device consists of a ZnO nanorod enclosed by two layers of Ag film. For diffraction-limited light focused on the nanorod, narrow passbands can be realized and tuned via variation of the nanorod diameter across the visible spectrum. The spectral and spatial filtering originates from scattering cancellation localized at the nanorod due to the cavity and nanorod exhibiting opposite effective dipole moments. This ability to realize high-performance optical filtering at the ultimate size introduces intriguing possibilities for nanoscale near-field communication or ultrahigh resolution imaging pixels.
DOI
10.1021/acs.nanolett.5b02049
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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