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  • 02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Nanoscale chemical imaging in photo-induced force microscopy

등록일
2018년 2월 23일 10시 59분 05초
접수번호
6217
발표코드
PHYS1-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 17시 : 00분
발표형식
심포지엄
발표분야
Physical Chemistry - Recent Trends in Time- and Spatial-resolved Spectromicroscope
저자 및
공동저자
Junghoon Jahng, Hyuksang Kwon, Eun Seong Lee*
Center for nano-characterization, Korea Research Institute of Standards and Science, Korea

We present the novel type of microscopy – photo-induced force microscopy (PiFM) [1, 2] and its applications. The photo-induced force, enhanced by the plasmonic field, depends on the local response of the media, i.e. local polarizability as well as the local absorption which resulted in the chemical selectivity with a spatial resolution of a few nanometers [3]. The advantage of this approach is that any optical transitions linear and nonlinear of molecules can be probed directly as a far-field free manner. This new form of microscopy operates in a regime of non-contact/tapping mode which is away from the hard-contact mode. In this work, we present theoretical and experimental analysis of linear and nonlinear optical responses such as Raman vibrational molecular states [2], the excited state absorption [4] in single molecular clusters, IR vibrational transition [5] and surface plasmon polaritons in thin gold film [6] in photo-induced force microscopy. The ability to apply AFM's for nanometer scale optical spectroscopic analysis will open new opportunities in materials science and biology by investigating the chemical and optical nature of individual molecules.

REFERENCES
1. I. Rajapaksa, et al., “Image force microscopy of molecular resonance: A microscope principle'', Appl. Phys. Lett. 97, 073121 (2010).
2. J. Jahng, et al., “Linear and Nonlinear Optical Spectroscopy at the Nanoscale with Photoinduced Force Microscopy'', Acc. Chem. Res., 48 (10), 2671-2679 (2015).
3. J. Jahng et. al, “Quantitative analysis of sideband coupling in photoinduced force microscopy”, Phys. Rev. B, 94, 195407 (2016).
4. J. Jahng et. al, “Ultrafast pump-probe force microscopy with nanoscale resolution”, Appl. Phys. Lett, 106, 083113 (2015).
5. D. Nowak, et. al., "Nanoscale chemical imaging by photoinduced force microscopy," Sci. Adv. 2, e1501571 (2016).
6. J. Jahng et. al, “Visualizing surface plasmon polaritons by their gradient force” Opt. Lett., 40 (21), 5058-5061 (2015)

Figure 1: Schematic of photo-induced force microscopy


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