Phase-Modulated Degenerate Parametric Amplification Microscopy
Name
1806.03493.pdf
Description
Accepted version
Size
2.23 MB
Format
Adobe PDF
Checksum (MD5)
2606bc0918a8c507513ee87d2c204e38
Author(s)
Gao, Yunan
Goodman, Aaron Jacob
Shen, Pin-Chun
Kong, Jing
Tisdale, William
Date Issued
June 22, 2018
Journal
Nano Letters
Publisher
American Chemical Society (ACS)
Citation
Gao, Yunan et al. "Phase-Modulated Degenerate Parametric Amplification Microscopy." Nano Letters 18,8 (June 2018): 5001-5006 © 2018 American Chemical Society
Version
Author's final manuscript
Abstract
Second-order nonlinear optical interactions, including second-harmonic generation (SHG) and sum-frequency generation (SFG), can reveal a wealth of information about chemical, electronic, and vibrational dynamics at the nanoscale. Here, we demonstrate a powerful and flexible new approach, called phase-modulated degenerate parametric amplification (DPA). The technique, which allows for facile retrieval of both the amplitude and phase of the second-order nonlinear optical response, has many advantages over conventional or heterodyne-detected SHG, including the flexibility to detect the signal at either the second harmonic or fundamental field wavelength. We demonstrate the capabilities of this approach by imaging multigrain flakes of single-layer MoS2. We identify the absolute crystal orientation of each MoS2 domain and resolve grain boundaries with high signal contrast and sub-diffraction-limited spatial resolution. This robust all-optical method can be used to characterize structure and dynamics in organic and inorganic systems, including biological tissue, soft materials, and metal and semiconductor nanostructures, and is particularly well-suited for imaging in media that are absorptive or highly scattering to visible and ultraviolet light. Keywords: Second-harmonic generation; super-resolution; MoS₂; grain boundary; 2D; transition metal dichalcogenide
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1021/acs.nanolett.8b01827
