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Title: Nanoscale plasmonic phenomena in CVD-grown MoS2 monolayer revealed by ultra-broadband synchrotron radiation based nano-FTIR spectroscopy and near-field microscopy

Abstract

Here, nanoscale plasmonic phenomena observed in single and bi-layers of molybdenum disulfide (MoS2) on silicon dioxide (SiO2) are reported. A scattering type scanning near-field optical microscope (s-SNOM) with a broadband synchrotron radiation (SR) infrared source was used. We also present complementary optical mapping using tunable CO2-laser radiation. Specifically, there is a correlation of the topography of well-defined MoS2 islands grown by chemical vapor deposition, as determined by atomic force microscopy, with the infrared (IR) signature of MoS2. The influence of MoS2 islands on the SiO2 phonon resonance is discussed. The results reveal the plasmonic character of the MoS2 structures and their interaction with the SiO2 phonons leading to an enhancement of the hybridized surface plasmon-phonon mode. A theoretical analysis shows that, in the case of monolayer islands, the coupling of the MoS2 optical plasmon mode to the SiO2 surface phonons does not affect the infrared spectrum significantly. For two-layer MoS2, the coupling of the extra inter-plane acoustic plasmon mode with the SiO2 surface transverse phonon leads to a remarkable increase of the surface phonon peak at 794 cm-1. This is in agreement with the experimental data. These results show the capability of the s-SNOM technique to study local multiple excitationsmore » in complex non-homogeneous structures.« less

Authors:
 [1];  [1];  [2];  [2];  [3];  [4];  [4];  [5];  [5];  [5];  [5];  [1]
  1. Freie Univ., Berlin (Germany). Inst. for Chemistry and Biochemistry and Physical Chemistry
  2. Univ. of California, Riverside, CA (United States). Dept. of Chemistry
  3. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy
  4. Univ. of Central Florida, Orlando, FL (United States). Dept. of Physics
  5. Physics-Technical Inst. (PTB), Berlin (Germany)
Publication Date:
Research Org.:
Univ. of Central Florida, Orlando, FL (United States)
Sponsoring Org.:
USDOE; German Research Foundation (DFG); Microelectronics Advanced Research Corp. (MARCO); Defense Advanced Research Projects Agency (DARPA)
OSTI Identifier:
1434579
Grant/Contract Number:  
FG02-07ER15842; FG02-07ER46354; SFB 1112 (TP B02); SRC 2381.002; SRC 2381.003
Resource Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 24; Journal Issue: 2; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; Instrumentation; Measurement; Metrology; Near-field microscopy; Thin Films; Spectroscopy; Infared; Spectral Properties

Citation Formats

Patoka, Piotr, Ulrich, Georg, Nguyen, Ariana E., Bartels, Ludwig, Dowben, Peter A., Turkowski, Volodymyr, Rahman, Talat S., Hermann, Peter, Kastner, Bernd, Hoehl, Arne, Ulm, Gerhard, and Ruhl, Eckart. Nanoscale plasmonic phenomena in CVD-grown MoS2 monolayer revealed by ultra-broadband synchrotron radiation based nano-FTIR spectroscopy and near-field microscopy. United States: N. p., 2016. Web. doi:10.1364/OE.24.001154.
Patoka, Piotr, Ulrich, Georg, Nguyen, Ariana E., Bartels, Ludwig, Dowben, Peter A., Turkowski, Volodymyr, Rahman, Talat S., Hermann, Peter, Kastner, Bernd, Hoehl, Arne, Ulm, Gerhard, & Ruhl, Eckart. Nanoscale plasmonic phenomena in CVD-grown MoS2 monolayer revealed by ultra-broadband synchrotron radiation based nano-FTIR spectroscopy and near-field microscopy. United States. doi:10.1364/OE.24.001154.
Patoka, Piotr, Ulrich, Georg, Nguyen, Ariana E., Bartels, Ludwig, Dowben, Peter A., Turkowski, Volodymyr, Rahman, Talat S., Hermann, Peter, Kastner, Bernd, Hoehl, Arne, Ulm, Gerhard, and Ruhl, Eckart. Wed . "Nanoscale plasmonic phenomena in CVD-grown MoS2 monolayer revealed by ultra-broadband synchrotron radiation based nano-FTIR spectroscopy and near-field microscopy". United States. doi:10.1364/OE.24.001154. https://www.osti.gov/servlets/purl/1434579.
@article{osti_1434579,
title = {Nanoscale plasmonic phenomena in CVD-grown MoS2 monolayer revealed by ultra-broadband synchrotron radiation based nano-FTIR spectroscopy and near-field microscopy},
author = {Patoka, Piotr and Ulrich, Georg and Nguyen, Ariana E. and Bartels, Ludwig and Dowben, Peter A. and Turkowski, Volodymyr and Rahman, Talat S. and Hermann, Peter and Kastner, Bernd and Hoehl, Arne and Ulm, Gerhard and Ruhl, Eckart},
abstractNote = {Here, nanoscale plasmonic phenomena observed in single and bi-layers of molybdenum disulfide (MoS2) on silicon dioxide (SiO2) are reported. A scattering type scanning near-field optical microscope (s-SNOM) with a broadband synchrotron radiation (SR) infrared source was used. We also present complementary optical mapping using tunable CO2-laser radiation. Specifically, there is a correlation of the topography of well-defined MoS2 islands grown by chemical vapor deposition, as determined by atomic force microscopy, with the infrared (IR) signature of MoS2. The influence of MoS2 islands on the SiO2 phonon resonance is discussed. The results reveal the plasmonic character of the MoS2 structures and their interaction with the SiO2 phonons leading to an enhancement of the hybridized surface plasmon-phonon mode. A theoretical analysis shows that, in the case of monolayer islands, the coupling of the MoS2 optical plasmon mode to the SiO2 surface phonons does not affect the infrared spectrum significantly. For two-layer MoS2, the coupling of the extra inter-plane acoustic plasmon mode with the SiO2 surface transverse phonon leads to a remarkable increase of the surface phonon peak at 794 cm-1. This is in agreement with the experimental data. These results show the capability of the s-SNOM technique to study local multiple excitations in complex non-homogeneous structures.},
doi = {10.1364/OE.24.001154},
journal = {Optics Express},
number = 2,
volume = 24,
place = {United States},
year = {2016},
month = {1}
}

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