Theoretical Study on Surface Mode in Photonic Crystal Fishbone Nanocavity

We propose and theoretically investigate a novel 1-D photonic crystal fishbone (FB) that can sustain surface waves. By designing a nanocavity in an FB, the confined surface mode with a high quality factor (~ 10 5 ) and extremely concentrated field near the FB surface (small mode volume, ~ 2.3 × 10 -...

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Bibliographic Details
Published in:Journal of lightwave technology 2015-11, Vol.33 (21), p.4445-4449
Main Authors: Lu, Tsan-Wen, Lee, Po-Tsung
Format: Article
Language:English
Subjects:
Charge carrier processes
Indexes
nanocavity
Nanostructure
Optical sensors
Optical surface waves
optical tweezers
Optical waveguides
Photonic crystals
Polystyrene resins
Quality factor
Simulation
surface wave
Surface waves
Thresholds
Trapping
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Summary:We propose and theoretically investigate a novel 1-D photonic crystal fishbone (FB) that can sustain surface waves. By designing a nanocavity in an FB, the confined surface mode with a high quality factor (~ 10 5 ) and extremely concentrated field near the FB surface (small mode volume, ~ 2.3 × 10 -2 (λ/2) 3 ) cause strong interactions between light and the surrounding medium for optical sensing and manipulation. In simulation, as an optical sensor, the proposed design achieved a high index sensitivity of 650 nm/RIU and minimum detectable index variation of 2 × 10 -5 . As optical tweezers, a simulated injected optical threshold power of only 80 μW is needed for stably trapping a polystyrene sphere (PS) 100 nm in diameter. In addition, a method of selectively trapping a PS of specific size is theoretically proposed via our design. We believe that our proposed FB nanocavity with a surface mode would provide enhanced features for on-chip optical sensors and tweezers.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2015.2474372