Low dispersion slow light in silicon-on-insulator photonic crystal waveguide

2010 ◽  
Author(s):  
Amir Hosseini ◽  
David Kwong ◽  
Harish Subbaraman ◽  
Ray T. Chen
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Silicon On Insulator ◽  
Photonic Crystal Waveguide ◽  
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.

Experiments with Phase-Delay and Time-Delay Methods for Slow Light in Photonic Crystal Waveguide

2013 ◽  
Vol 684 ◽  
pp. 290-294
Author(s):  
Hui Lu ◽  
Li Jun Zhang ◽  
Zhan Qi Zheng ◽  
Yi Heng Zhang ◽  
Yong Qing Leng
Keyword(s):  
Photonic Crystal ◽  
Time Delay ◽  
Theoretical Result ◽  
Slow Light ◽  
Phase Delay ◽  
Silicon On Insulator ◽  
Group Index ◽  
Experimental Measurements ◽  
Photonic Crystal Waveguide ◽  
Good Agreement

In this paper, we report the experimental measurements of the group index of a photonic crystal waveguide based on silicon-on-insulator slab. The time-delay of the pulse is also measured, and it is in good agreement with the theoretical result calculated according to the group index with the phase-delay method, which is about 4.7ps.

Wideband and low dispersion slow light by altering the geometry of a photonic crystal waveguide

2018 ◽  
Vol 427 ◽  
pp. 396-404 ◽  
Author(s):  
Abdesselam Hocini ◽  
Mouhssin Maache ◽  
Djamel Khedrouche
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Photonic Crystal Waveguide ◽  
Low Dispersion
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