TY - JOUR
T1 - Waveguide Bandgap in Crystalline Bandgap Slows Down Surface Plasmon Polariton
AU - Saito, Hikaru
AU - Yamamoto, Naoki
AU - Sannomiya, Takumi
N1 - Funding Information:
This work was supported by Kazato Research Foundation, and a part of this work was supported by Tokyo Institute of Technology in "Nanotechnology Platform Project" sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/6/21
Y1 - 2017/6/21
N2 - Next generation on-chip optical devices require light manipulation in time and space, that is, control of group velocity of light in subwavelength dimensions. A waveguide in plasmonic crystal fulfills such requirements offering nanoscale light confinement in the dispersion-tunable plasmonic crystal matrix. However, there has been no direct access to the local dispersion of the waveguide mode itself, and the group velocity of light could not be evaluated. Herein, for the first time, we experimentally clarify the dispersion of the waveguide modes by use of angle-resolved cathodoluminescence scanning transmission electron microscopy. Their group velocity can be extremely slowed down by the existence of a bandgap formed in the waveguide in the energy range of the plasmonic crystal bandgap.
AB - Next generation on-chip optical devices require light manipulation in time and space, that is, control of group velocity of light in subwavelength dimensions. A waveguide in plasmonic crystal fulfills such requirements offering nanoscale light confinement in the dispersion-tunable plasmonic crystal matrix. However, there has been no direct access to the local dispersion of the waveguide mode itself, and the group velocity of light could not be evaluated. Herein, for the first time, we experimentally clarify the dispersion of the waveguide modes by use of angle-resolved cathodoluminescence scanning transmission electron microscopy. Their group velocity can be extremely slowed down by the existence of a bandgap formed in the waveguide in the energy range of the plasmonic crystal bandgap.
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U2 - 10.1021/acsphotonics.6b00943
DO - 10.1021/acsphotonics.6b00943
M3 - Article
AN - SCOPUS:85021087691
SN - 2330-4022
VL - 4
SP - 1361
EP - 1370
JO - ACS Photonics
JF - ACS Photonics
IS - 6
ER -