Optimization of One Dimensional Photonic Crystal Elliptical-Hole Low-Index Mode Nanobeam Cavities for On-Chip Sensing
- 2 June 2016
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 34 (15), 3496-3502
- https://doi.org/10.1109/jlt.2016.2575840
Abstract
We report the design of one dimensional photonic crystal nanobeam cavities with elliptical holes that is fully encapsulated in the water environment and can confine the light in the low index region. The proposed structure, based on the principle of gentle confinement of the electromagnetic field, is designed by tapering the width of the host photonic crystal waveguide away from the center of the cavity while keeping other parameters constant. With elliptical-hole low-index mode nanobeam cavities and tapered waveguide widths, through three dimensional finite-difference time-domain simulations, large band-gap and high reflectivity are achieved to confine the optical mode. Also, the electric field is confined in the elliptical holes, which helps to enhance the sensitivity. The simulation results demonstrate that we achieve the highest quality factor of 1.35 × 10 5 when 15 taper segments and 15 additional mirror segments are placed on both sides of the host waveguide. A sensitivity of 390 nm/RIU (refractive index unit) and mode volume of 2.23 (λ res /n si ) 3 are achieved in the water environment, thus showing exceptionally good on-chip sensing properties with respect to high sensitivity, small footprints and masses.Funding Information
- NSFC (61372038)
- Fund of State Key Laboratory of Information Photonics and Optical Communications (IPOC2015ZC02)
- Postgraduate Innovation Fund of SICE
- BUPT
- China Scholarship Council (201506470010)
This publication has 33 references indexed in Scilit:
- Analysis of ultra-high sensitivity configuration in chip-integrated photonic crystal microcavity bio-sensorsApplied Physics Letters, 2014
- Dispersion Engineering of Slow Light in Ellipse-Shaped-Hole Slotted Photonic Crystal WaveguideJournal of Lightwave Technology, 2014
- Silicon nano-membrane based photonic crystal microcavities for high sensitivity bio-sensingOptics Letters, 2012
- Methods to array photonic crystal microcavities for high throughput high sensitivity biosensing on a silicon-chip based platformLab on a Chip, 2012
- Silicon photonic crystal nanocavity-coupled waveguides for error-corrected optical biosensingBiosensors and Bioelectronics, 2011
- Photonic crystal slot nanobeam slow light waveguides for refractive index sensingApplied Physics Letters, 2010
- Photonic crystal nanostructures for optical biosensing applicationsBiosensors and Bioelectronics, 2009
- Design of Photonic Crystal Nanocavity With $Q$-Factor of ${{\sim}10^{9}}$Journal of Lightwave Technology, 2008
- Liquid-infiltrated photonic crystals: enhanced light-matter interactions for lab-on-a-chip applicationsMicrofluidics and Nanofluidics, 2007
- High-Q photonic nanocavity in a two-dimensional photonic crystalNature, 2003