The ultrafast modulation of light transmitted by a metamaterial making up an extraordinary optical transmission geometry is investigated by means of optical pump-probe spectroscopy. Using a sample consisting of a lattice of square nano-holes in a gold film on a glass substrate, we monitor the high-frequency oscillations in the intensity of transmitted infrared light. A variety of gigahertz acoustic modes, involving the opening and shutting motion of the holes as well as the straining of the glass substrate below the holes, are revealed to be active in the optical modulation. Numerical simulations of the transient deformations and strain fields elucidate the nature of the vibrational modes contributing most strongly to the variations in optical transmission, and point to the hole-area modulation as the dominant effect. Potential applications include ultrafast acousto-optic modulators.
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27 February 2017
Research Article|
March 02 2017
Elucidating gigahertz acoustic modulation of extraordinary optical transmission through a two-dimensional array of nano-holes
R. Ulbricht;
R. Ulbricht
1Division of Applied Physics, Graduate School of Engineering,
Hokkaido University
, Sapporo 060-8628, Japan
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H. Sakuma;
H. Sakuma
1Division of Applied Physics, Graduate School of Engineering,
Hokkaido University
, Sapporo 060-8628, Japan
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Y. Imade
;
Y. Imade
1Division of Applied Physics, Graduate School of Engineering,
Hokkaido University
, Sapporo 060-8628, Japan
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P. H. Otsuka;
P. H. Otsuka
1Division of Applied Physics, Graduate School of Engineering,
Hokkaido University
, Sapporo 060-8628, Japan
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M. Tomoda;
M. Tomoda
1Division of Applied Physics, Graduate School of Engineering,
Hokkaido University
, Sapporo 060-8628, Japan
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O. Matsuda;
O. Matsuda
1Division of Applied Physics, Graduate School of Engineering,
Hokkaido University
, Sapporo 060-8628, Japan
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H. Kim;
H. Kim
2School of Mechanical Engineering,
Korea University
, 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea
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G.-W. Park;
G.-W. Park
2School of Mechanical Engineering,
Korea University
, 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea
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O. B. Wright
O. B. Wright
a)
1Division of Applied Physics, Graduate School of Engineering,
Hokkaido University
, Sapporo 060-8628, Japan
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a)
Electronic mail: olly@eng.hokudai.ac.jp
Appl. Phys. Lett. 110, 091910 (2017)
Article history
Received:
November 23 2016
Accepted:
February 12 2017
Citation
R. Ulbricht, H. Sakuma, Y. Imade, P. H. Otsuka, M. Tomoda, O. Matsuda, H. Kim, G.-W. Park, O. B. Wright; Elucidating gigahertz acoustic modulation of extraordinary optical transmission through a two-dimensional array of nano-holes. Appl. Phys. Lett. 27 February 2017; 110 (9): 091910. https://doi.org/10.1063/1.4977430
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