Observation of light propagation across a 90 degrees corner in chains of microspheres on a patterned substrate.
To demonstrate light-path manipulation in arbitrary shapes we fabricated coupled-resonator optical waveguides (CROWs) having a 90 degrees-corner structure on a lithographically patterned substrate. The spectra of propagation light within the CROWs were directly measured by guide-collection-mode near-field scanning optical microscopy. The spectra revealed that the propagation light through the CROWs has a larger transverse-magnetic polarization mode than a transverse-electric (TE) one. The most plausible cause of the lower intensity in the TE mode is that light leaks out to the Si substrate.
Quantum Dot Research Center, National Institute for Materials Science, Tsukuba, Ibaraki, Japan. mitsui.tadashi@nims.go.jp
Tadashi
T
Mitsui
Yutaka
Y
Wakayama
Tsunenobu
T
Onodera
Yosuke
Y
Takaya
Hidetoshi
H
Oikawa