共 61 条
Self-Phase-Stabilized Heterodyne Vibrational Sum Frequency Generation Microscopy
被引:41
作者:
Wang, Haoyuan
[1
]
Gao, Tian
[1
,2
]
Xiong, Wei
[1
]
机构:
[1] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA
[2] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Hubei, Peoples R China
基金:
美国国家科学基金会;
关键词:
vibrational sum frequency generation;
microscopy;
phase-resolved;
self-assembly;
nonlinear optics;
INTERFACIAL WATER-STRUCTURE;
ORIENTATION;
DYNAMICS;
CARRIER;
SPECTROMETER;
SPECTROSCOPY;
POLARIZATION;
SURFACES;
PROBE;
FIELD;
D O I:
10.1021/acsphotonics.7b00411
中图分类号:
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
Vibrational sum frequency generation (VSFG) spectroscopy has been a powerful technique to probe molecular structures in non-centrosymmetric media. Recently developed heterodyne (HD) detection can further reveal spectral phase and molecular orientations. Adding imaging capability to an HD VSFG signal can bring spatial visualization capability into this nonlinear optical technique. However, it has been a challenge to build an HD VSFG microscope that is easy to align and has good spectral phase stability, two necessary criteria for the broad application of this technique to various areas of science. Here, we report a fully collinear HD VSFG microscope, which meets both phase stability and optical alignment requirements, that can spatially resolve images of molecular interfaces and domains, with chemical and structural sensitivities. The phase stability is more than 9 times better than a Michelson interferometric HD VSFG microscope. Using this HD VSFG microscope, we study the structures of molecular self-assembly films. Because of the superior phase sensitivity, we successfully identify two molecular domains with different molecular orientations, which we show is not possible to extract from an ensemble-averaged VSFG spectrum or homodyne-detected VSFG image.
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页码:1839 / 1845
页数:7
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