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Park, Kyoung-Duck
Nano-PhotoEnergy Group at UNIST Physics
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Adaptive tip-enhanced nano-spectroscopy

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Title
Adaptive tip-enhanced nano-spectroscopy
Author
Lee, Dong YunPark, ChulhoChoi, JinseongKoo, YeonjeongKang, MinguJeong, Mun SeokRaschke, Markus B.Park, Kyoung-Duck
Issue Date
2021-06
Publisher
NATURE RESEARCH
Citation
NATURE COMMUNICATIONS, v.12, no.1, pp.3465
Abstract
Tip-enhanced nano-spectroscopy, such as tip-enhanced photoluminescence (TEPL) and tip-enhanced Raman spectroscopy (TERS), generally suffers from inconsistent signal enhancement and difficulty in polarization-resolved measurement. To address this problem, we present adaptive tip-enhanced nano-spectroscopy optimizing the nano-optical vector-field at the tip apex. Specifically, we demonstrate dynamic wavefront shaping of the excitation field to effectively couple light to the tip and adaptively control for enhanced sensitivity and polarization-controlled TEPL and TERS. Employing a sequence feedback algorithm, we achieve similar to 4.4x10(4)-fold TEPL enhancement of a WSe2 monolayer which is >2x larger than the normal TEPL intensity without wavefront shaping. In addition, with dynamical near-field polarization control in TERS, we demonstrate the investigation of conformational heterogeneity of brilliant cresyl blue molecules and the controllable observation of IR-active modes due to a large gradient field effect. Adaptive tip-enhanced nano-spectroscopy thus provides for a systematic approach towards computational nanoscopy making optical nano-imaging more robust and widely deployable. Tip-enhanced nano-spectroscopy suffers from inconsistent signal and difficulty in polarization-resolved measurement. Here, the authors present adaptive tip-enhanced nano-spectroscopy, which enables the additional signal enhancement and near-field polarization control via dynamic wavefront shaping.
URI
https://scholarworks.unist.ac.kr/handle/201301/54087
URL
https://www.nature.com/articles/s41467-021-23818-1
DOI
10.1038/s41467-021-23818-1
ISSN
2041-1723
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