Volume 99, Number 5, September 2012
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 September 2012|
Tune the “rainbow” trapped in a multilayered waveguide
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China
Received: 14 June 2012
Accepted: 8 August 2012
The “rainbow”, where the light waves with different frequencies separate spatially, is confined in a self-similar waveguide with a hollow core coated by a coaxial dielectric/liquid-crystal multilayer. Due to the intrinsic self-similar furcation of the system, multiple transmission bands emerge in the photonic band structure, a “rainbow” is trapped as cladding modes in the waveguide. Both photonic bands and transmission modes can be tuned by changing temperature, hence the “rainbow” changes the colors in the waveguide. This effect can be applied in designing temperature-dependent integrated photonic devices, such as tunable on-chip spectroscopy, on-chip color-sorters, and photon sorters for spectral imaging.
PACS: 78.67.Pt – Multilayers; superlattices; photonic structures; metamaterials / 61.44.Br – Quasicrystals / 42.70.Qs – Photonic bandgap materials
© EPLA, 2012
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