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Title: Far Infrared Synchrotron Near-Field Nanoimaging and Nanospectroscopy

Here, scattering scanning near-field optical microscopy (s-SNOM) has emerged as a powerful imaging and spectroscopic tool for investigating nanoscale heterogeneities in biology, quantum matter, and electronic and photonic devices. However, many materials are defined by a wide range of fundamental molecular and quantum states at far-infrared (FIR) resonant frequencies currently not accessible by s-SNOM. Here we show ultrabroadband FIR s-SNOM nanoimaging and spectroscopy by combining synchrotron infrared radiation with a novel fast and low-noise copper-doped germanium (Ge:Cu) photoconductive detector. This approach of FIR synchrotron infrared nanospectroscopy (SINS) extends the wavelength range of s-SNOM to 31 μm (320 cm –1, 9.7 THz), exceeding conventional limits by an octave to lower energies. We demonstrate this new nanospectroscopic window by measuring elementary excitations of exemplary functional materials, including surface phonon polariton waves and optical phonons in oxides and layered ultrathin van der Waals materials, skeletal and conformational vibrations in molecular systems, and the highly tunable plasmonic response of graphene.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ; ORCiD logo [3] ;  [4]
  1. Univ. of Colorado, Boulder, CO (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
BNL-205714-2018-JAAM
Journal ID: ISSN 2330-4022
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
ACS Photonics
Additional Journal Information:
Journal Name: ACS Photonics; Journal ID: ISSN 2330-4022
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; far-infrared; graphene plasmonics; near-field microscopy; s-SNOM; spatiospectral nanoimaging; synchrotron infrared nanospectroscopy
OSTI Identifier:
1439299

Khatib, Omar, Bechtel, Hans A., Martin, Michael C., Raschke, Markus B., and Carr, G. Lawrence. Far Infrared Synchrotron Near-Field Nanoimaging and Nanospectroscopy. United States: N. p., Web. doi:10.1021/acsphotonics.8b00565.
Khatib, Omar, Bechtel, Hans A., Martin, Michael C., Raschke, Markus B., & Carr, G. Lawrence. Far Infrared Synchrotron Near-Field Nanoimaging and Nanospectroscopy. United States. doi:10.1021/acsphotonics.8b00565.
Khatib, Omar, Bechtel, Hans A., Martin, Michael C., Raschke, Markus B., and Carr, G. Lawrence. 2018. "Far Infrared Synchrotron Near-Field Nanoimaging and Nanospectroscopy". United States. doi:10.1021/acsphotonics.8b00565.
@article{osti_1439299,
title = {Far Infrared Synchrotron Near-Field Nanoimaging and Nanospectroscopy},
author = {Khatib, Omar and Bechtel, Hans A. and Martin, Michael C. and Raschke, Markus B. and Carr, G. Lawrence},
abstractNote = {Here, scattering scanning near-field optical microscopy (s-SNOM) has emerged as a powerful imaging and spectroscopic tool for investigating nanoscale heterogeneities in biology, quantum matter, and electronic and photonic devices. However, many materials are defined by a wide range of fundamental molecular and quantum states at far-infrared (FIR) resonant frequencies currently not accessible by s-SNOM. Here we show ultrabroadband FIR s-SNOM nanoimaging and spectroscopy by combining synchrotron infrared radiation with a novel fast and low-noise copper-doped germanium (Ge:Cu) photoconductive detector. This approach of FIR synchrotron infrared nanospectroscopy (SINS) extends the wavelength range of s-SNOM to 31 μm (320 cm–1, 9.7 THz), exceeding conventional limits by an octave to lower energies. We demonstrate this new nanospectroscopic window by measuring elementary excitations of exemplary functional materials, including surface phonon polariton waves and optical phonons in oxides and layered ultrathin van der Waals materials, skeletal and conformational vibrations in molecular systems, and the highly tunable plasmonic response of graphene.},
doi = {10.1021/acsphotonics.8b00565},
journal = {ACS Photonics},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {5}
}