Dynamic tuning of slow light transmission in manual nanostructure photonic crystal waveguide

2009 ◽  
Vol 6 (7/8) ◽  
pp. 715
Author(s):  
Changhong Li ◽  
Huiping Tian ◽  
Hui Lu ◽  
Yuefeng Ji
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Light Transmission ◽  
Photonic Crystal Waveguide ◽  
Dynamic Tuning

Ultra-wideband slow light transmission with high normalized delay bandwidth product in W3 photonic crystal waveguide

2018 ◽  
Vol 121 ◽  
pp. 45-54 ◽  
Author(s):  
Sayed Elshahat ◽  
Israa Abood ◽  
Karim Khan ◽  
Ashish Yadav ◽  
Qiong Wang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Light Transmission ◽  
Ultra Wideband ◽  
Photonic Crystal Waveguide

Improved line defect structures for slow light transmission in photonic crystal waveguide

2007 ◽  
Vol 279 (1) ◽  
pp. 214-218 ◽  
Author(s):  
Changhong Li ◽  
Huiping Tian ◽  
Cui Zheng ◽  
Yuefeng Ji
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Light Transmission ◽  
Defect Structures ◽  
Photonic Crystal Waveguide ◽  
Line Defect

scholarly journals Double-layer graphene on photonic crystal waveguide electro-absorption modulator with 12 GHz bandwidth

Nanophotonics ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 2377-2385 ◽  
Author(s):  
Zhao Cheng ◽  
Xiaolong Zhu ◽  
Michael Galili ◽  
Lars Hagedorn Frandsen ◽  
Hao Hu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Double Layer ◽  
Slow Light ◽  
Modulation Depth ◽  
Photonic Crystal Waveguide ◽  
Optical Modulators ◽  
Layer Graphene ◽  
Silicon Photonic ◽  
On Chip ◽  
Silicon Based

AbstractGraphene has been widely used in silicon-based optical modulators for its ultra-broadband light absorption and ultrafast optoelectronic response. By incorporating graphene and slow-light silicon photonic crystal waveguide (PhCW), here we propose and experimentally demonstrate a unique double-layer graphene electro-absorption modulator in telecommunication applications. The modulator exhibits a modulation depth of 0.5 dB/μm with a bandwidth of 13.6 GHz, while graphene coverage length is only 1.2 μm in simulations. We also fabricated the graphene modulator on silicon platform, and the device achieved a modulation bandwidth at 12 GHz. The proposed graphene-PhCW modulator may have potentials in the applications of on-chip interconnections.

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.

scholarly journals Unidirectional Slow Light Transmission in Heterostructure Photonic Crystal Waveguide

2018 ◽  
Vol 8 (10) ◽  
pp. 1858 ◽  
Author(s):  
Qiuyue Zhang ◽  
Xun Li
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Environmental Changes ◽  
Light Transmission ◽  
Square Lattice ◽  
Manufacturing Defects ◽  
Interfacial Defects ◽  
Waveguide Design ◽  
Light Waveguide ◽  
Backward Propagation

In conventional photonic crystal systems, extrinsic scattering resulting from random manufacturing defects or environmental changes is a major source of loss that causes performance degradation, and the backscattering loss is amplified as the group velocity slows down. In order to overcome the limitations in slow light systems, we propose a backscattering-immune slow light waveguide design. The waveguide is based on an interface between a square lattice of magneto-optical photonic crystal with precisely tailored rod radii of the first two rows and a titled 45 degrees square lattice of Alumina photonic crystal with an aligned band gap. High group indices of 77, 68, 64, and 60 with the normalized frequency bandwidths of 0.444%, 0.481%, 0.485%, and 0.491% are obtained, respectively. The corresponding normalized delay-bandwidth products remain around 0.32 for all cases, which are higher than previously reported works based on rod radius adjustment. The robustness for the edge modes against different types of interfacial defects is observed for the lack of backward propagation modes at the same frequencies as the unidirectional edge modes. Furthermore, the transmission direction can be controlled by the sign of the externally applied magnetic field normal to the plane.

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