TY - JOUR
T1 - Characterization of Nonradiative Bloch Modes in a Plasmonic Triangular Lattice by Electron Energy-Loss Spectroscopy
AU - Yoshimoto, Daichi
AU - Saito, Hikaru
AU - Hata, Satoshi
AU - Fujiyoshi, Yoshifumi
AU - Kurata, Hiroki
N1 - Funding Information:
This work was supported by the Tokyo Institute of Technology and Kyoto University in the “Nanotechnology Platform Project” sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, and the Japan Society for the Promotion of Science Kakenhi No. 17K14118, The Murata Science Foundation, and Kazato Research Foundation. We thank the Edanz Group (www. edanzediting.com/ac) for editing a draft of this manuscript.
Publisher Copyright:
Copyright © 2018 American Chemical Society.
PY - 2018/11/21
Y1 - 2018/11/21
N2 - Electron beam spectroscopy has recently attracted much attention in the modal analysis of nanophotonic and plasmonic systems. In principle, electron energy-loss spectroscopy (EELS) provides information about the electromagnetic local density of states of all sorts of electromagnetic modes as well as nonradiative modes. However, there have not been many examples related to the EELS analyses for electromagnetic Bloch modes. Herein, EELS measurements are performed for the characterization of nonradiative band-edge modes facing the first bandgap in a plasmonic crystal with a triangular lattice, which is well-known for its full bandgap formation. The obtained spectrum images clearly determine the characteristics of the lower and upper band-edge modes, compared with an analytical model based on group theory and a numerical simulation by the finite-difference time-domain method. The EELS spectra also reveal differences in the plasmonic density of states between the lower and upper band-edges, which provides information about the band deformation near the bandgap.
AB - Electron beam spectroscopy has recently attracted much attention in the modal analysis of nanophotonic and plasmonic systems. In principle, electron energy-loss spectroscopy (EELS) provides information about the electromagnetic local density of states of all sorts of electromagnetic modes as well as nonradiative modes. However, there have not been many examples related to the EELS analyses for electromagnetic Bloch modes. Herein, EELS measurements are performed for the characterization of nonradiative band-edge modes facing the first bandgap in a plasmonic crystal with a triangular lattice, which is well-known for its full bandgap formation. The obtained spectrum images clearly determine the characteristics of the lower and upper band-edge modes, compared with an analytical model based on group theory and a numerical simulation by the finite-difference time-domain method. The EELS spectra also reveal differences in the plasmonic density of states between the lower and upper band-edges, which provides information about the band deformation near the bandgap.
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U2 - 10.1021/acsphotonics.8b00936
DO - 10.1021/acsphotonics.8b00936
M3 - Article
AN - SCOPUS:85056279369
SN - 2330-4022
VL - 5
SP - 4476
EP - 4483
JO - ACS Photonics
JF - ACS Photonics
IS - 11
ER -