Apodized photonic crystal waveguide gratings

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.

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

Nanophotonics ◽

10.1515/nanoph-2020-0576 ◽

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.

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Experimental demonstration of prism coupling of infrared waves into planar photonic crystal waveguide devices

Optical Engineering ◽

10.1117/1.2125427 ◽

2005 ◽

Vol 44 (11) ◽

pp. 114601

Author(s):

Chunchen Lin

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Waveguide ◽

Experimental Demonstration ◽

Waveguide Devices ◽

Prism Coupling

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InGaAs nano-photodetectors based on photonic crystal waveguide including ultracompact buried heterostructure

2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR) ◽

10.1109/cleopr.2013.6599949 ◽

2013 ◽

Cited By ~ 1

Author(s):

Kengo Nozaki ◽

Shinji Matsuo ◽

Koji Takeda ◽

Tomonari Sato ◽

Eiichi Kuramochi ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Waveguide ◽

Buried Heterostructure

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Simulation of Broadband Transmission Photonic Crystal Waveguide Crossing with Linear Taper

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.479-480.133 ◽

2013 ◽

Vol 479-480 ◽

pp. 133-136

Author(s):

Yih Bin Lin ◽

Rei Shin Chen ◽

Ting Chung Yu ◽

Ju Feng Liu

Keyword(s):

Photonic Crystal ◽

Finite Difference ◽

Cross Talk ◽

Time Domain ◽

Finite Difference Time Domain ◽

Transmission Band ◽

Time Domain Method ◽

Photonic Crystal Waveguide ◽

Difference Time ◽

Novel Design

A novel design of photonic crystal waveguide crossing with taper structure is proposed. Simulations are performed by finite-difference time-domain method. The results show the proposed design has both high transmission and low cross talk characteristics. The transmission band and low cross talk band can be tuned to match each other by adjusting the taper structure..

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