Wideband Slow Light With Large Group Index and Low Dispersion in Slotted Photonic Crystal Waveguide

2012 ◽  
Vol 30 (17) ◽  
pp. 2812-2817 ◽  
Author(s):  
Yong Zhao ◽  
Ya-Nan Zhang ◽  
Di Wu ◽  
Qi Wang
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Group Index ◽  
Photonic Crystal Waveguide ◽  
Large Group ◽  
Low Dispersion

scholarly journals Towards lab-on-chip ultrasensitive ethanol detection using photonic crystal waveguide operating in the mid infrared

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Rostamian ◽  
Ehsan Madadi-Kandjani ◽  
Hamed Dalir ◽  
Volker J. Sorger ◽  
Ray T. Chen
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
High Sensitivity ◽  
Guided Wave ◽  
Silicon On Insulator ◽  
Group Index ◽  
Photonic Crystal Waveguide ◽  
Mid Infrared ◽  
Lab On Chip ◽  
On Chip

Abstract Thanks to the unique molecular fingerprints in the mid-infrared spectral region, absorption spectroscopy in this regime has attracted widespread attention in recent years. Contrary to commercially available infrared spectrometers, which are limited by being bulky and cost-intensive, laboratory-on-chip infrared spectrometers can offer sensor advancements including raw sensing performance in addition to use such as enhanced portability. Several platforms have been proposed in the past for on-chip ethanol detection. However, selective sensing with high sensitivity at room temperature has remained a challenge. Here, we experimentally demonstrate an on-chip ethyl alcohol sensor based on a holey photonic crystal waveguide on silicon on insulator-based photonics sensing platform offering an enhanced photoabsorption thus improving sensitivity. This is achieved by designing and engineering an optical slow-light mode with a high group-index of n g  = 73 and a strong localization of modal power in analyte, enabled by the photonic crystal waveguide structure. This approach includes a codesign paradigm that uniquely features an increased effective path length traversed by the guided wave through the to-be-sensed gas analyte. This PIC-based lab-on-chip sensor is exemplary, spectrally designed to operate at the center wavelength of 3.4 μm to match the peak absorbance for ethanol. However, the slow-light enhancement concept is universal offering to cover a wide design-window and spectral ranges towards sensing a plurality of gas species. Using the holey photonic crystal waveguide, we demonstrate the capability of achieving parts per billion levels of gas detection precision. High sensitivity combined with tailorable spectral range along with a compact form-factor enables a new class of portable photonic sensor platforms when combined with integrated with quantum cascade laser and detectors.

Large group-index bandwidth product empty core slow light photonic crystal waveguides for hybrid silicon photonics

2014 ◽  
Vol 7 (3) ◽  
pp. 376-384 ◽  
Author(s):  
Charles Caer ◽  
Xavier Le Roux ◽  
Samuel Serna ◽  
Weiwei Zhang ◽  
Laurent Vivien ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Silicon Photonics ◽  
Slow Light ◽  
Group Index ◽  
Photonic Crystal Waveguides ◽  
Large Group ◽  
Hybrid Silicon ◽  
Empty Core

On the role of evanescent modes and group index tapering in slow light photonic crystal waveguide coupling efficiency

2011 ◽  
Vol 98 (3) ◽  
pp. 031107 ◽  
Author(s):  
Amir Hosseini ◽  
Xiaochuan Xu ◽  
David N. Kwong ◽  
Harish Subbaraman ◽  
Wei Jiang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Coupling Efficiency ◽  
Group Index ◽  
Photonic Crystal Waveguide ◽  
Waveguide Coupling

Slow light with large group index–bandwidth product in ellipse-hole photonic crystal waveguides

2015 ◽  
Vol 54 (6) ◽  
pp. 1543 ◽  
Author(s):  
Xu Han ◽  
Tao Wang ◽  
Jian Tang ◽  
Bo Liu ◽  
BoYun Wang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Group Index ◽  
Photonic Crystal Waveguides ◽  
Large Group
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