Dispersion engineering and thermo-optic tuning in mid-infrared photonic crystal slow light waveguides on silicon-on-insulator

2018 ◽  
Vol 43 (22) ◽  
pp. 5504 ◽  
Author(s):  
Yiming Ma ◽  
Bowei Dong ◽  
Bo Li ◽  
Kah-Wee Ang ◽  
Chengkuo Lee
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Silicon On Insulator ◽  
Mid Infrared ◽  
Dispersion Engineering

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.

Slow-light photonic crystal waveguides with ring-shaped holes on silicon-on-insulator

2008 ◽  
Author(s):  
Antti Säynätjoki ◽  
Mikaël Mulot ◽  
Kevin Vynck ◽  
David Cassagne ◽  
Jouni Ahopelto ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Silicon On Insulator ◽  
Photonic Crystal Waveguides

Slow light in slot photonic crystal waveguides by dispersion engineering

2012 ◽  
Author(s):  
Charles Caer ◽  
Xavier Le Roux ◽  
Delphine Marris-Morini ◽  
Laurent Vivien ◽  
Eric Cassan
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Photonic Crystal Waveguides ◽  
Dispersion Engineering

scholarly journals Numerical Investigation of Mid-Infrared Supercontinuum Generation in GeAsSe Based Chalcogenide Photonic Crystal Fiber Using Low Peak Power

2016 ◽  
Vol 8 (4) ◽  
pp. 29 ◽  
Author(s):  
M. R. Karim ◽  
B. M. A. Rahman
Keyword(s):  
Photonic Crystal ◽  
Numerical Simulations ◽  
Photonic Crystal Fiber ◽  
Peak Power ◽  
Infrared Region ◽  
Mid Infrared ◽  
Dispersion Engineering ◽  
Crystal Fiber ◽  
Dispersion Wavelength ◽  
Zero Dispersion Wavelength

We numerically investigate the use of photonic crystal fiber (PCF) through dispersion engineering of its cladding containing air-holes for supercontinuum (SC) generation in the mid-infrared region using low peak power. A 3.6-cm-long PCF made using Ge11.5As24Se64.5 chalcogenide (ChG) glass with a hexagonal array of air-holes was optimized for obtaining zero-dispersion wavelength through dispersion tailoring around the pump wavelength of 4 μm. We have performed numerical simulations for such dispersion tailored ChG PCF with the peak power range between 0.25 kW and 2 kW. It was found through rigorous numerical simulations that an ultrabroadband mid-infrared SC spectra covering the wavelength range 2-8 μm which is equivalent to 2 octaves could be generated using pump pulses of 320 fs duration at a wavelength of 4 μm with a relatively low peak power of 2 kW by using our proposed ChG PCF design.

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