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분자 분광학 및 동력학 연구단
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Near-field transmission matrix microscopy for mapping high-order eigenmodes of subwavelength nanostructures

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Title
Near-field transmission matrix microscopy for mapping high-order eigenmodes of subwavelength nanostructures
Author(s)
Eunsung Seo; Young-Ho Jin; Wonjun Choi; Yonghyeon Jo; Lee, Suyeon; Kyung-Deok Song; Joonmo Ahn; Park, Q.-Han; Kim, Myung-Ki; Wonshik Choi
Subject
Imaging and sensing, Nanophotonics and plasmonics, Super-resolution microscopy
Publication Date
2020-05
Journal
Nature Communications, v.11, no.1, pp.2575
Publisher
NATURE PUBLISHING GROUP
Abstract
© 2020, The Author(s).As nanoscale photonic devices are densely integrated, multiple near-field optical eigenmodes take part in their functionalization. Inevitably, these eigenmodes are highly multiplexed in their spectra and superposed in their spatial distributions, making it extremely difficult for conventional near-field scanning optical microscopy (NSOM) to address individual eigenmodes. Here, we develop a near-field transmission matrix microscopy for mapping the high-order eigenmodes of nanostructures, which are invisible with conventional NSOM. At an excitation wavelength where multiple modes are superposed, we measure the near-field amplitude and phase maps for various far-field illumination angles, from which we construct a fully phase-referenced far- to near-field transmission matrix. By performing the singular value decomposition, we extract orthogonal near-field eigenmodes such as anti-symmetric mode and quadruple mode of multiple nano-slits whose gap size (50 nm) is smaller than the probe aperture (150 nm). Analytic model and numerical mode analysis validated the experimentally observed modes
URI
https://pr.ibs.re.kr/handle/8788114/7864
DOI
10.1038/s41467-020-16263-z
ISSN
2041-1723
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > 1. Journal Papers (저널논문)
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