Optical properties of nanoengineered gold blocks.
We report on control over the extinction spectrum of tetragonal gold nanoblocks by changing their lateral aspect ratio. Nanoblocks were patterned on a glass substrate by electron-beam lithography and were 40-400 nm in lateral dimensions and spanned from 1 to 9 in aspect ratio. This allowed us to tune the localized surface plasmon bands from 700 nm to 1.5 microm (longitudinal mode) and from 700 to 550 nm (transverse mode). Unprecedented polarization selectivity of the transverse and longitudinal plasmon bands was achieved via alignment and 3D control of the dimensions of the nanoblocks.
Ueno
Kosei
K
Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021, Japan.
Mizeikis
Vygantas
V
Juodkazis
Saulius
S
Sasaki
Keiji
K
Misawa
Hiroaki
H