Design and Optimization of an Al Doped ZnO in Si-Slot for Gas Sensing

A Silicon waveguide incorporating a vertical slot filled with Al +3 doped ZnO is proposed for gas sensing. The effect of different device parameters, namely, slot-height, slot-width, and Si-width on two key optical features related to sensing, that is, difference in effective index and differential...

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Bibliographic Details
Published in:IEEE photonics journal 2018-08, Vol.10 (4), p.1-10
Main Authors: Bhattacharjee, Ritapa, Kejalakshmy, N. T., Rahman, B. M. Azizur
Format: Article
Language:English
Subjects:
Aluminum
Design optimization
Detection
Finite element method
Gas sensors
II-VI semiconductor materials
Indexes
Optical losses
Optical waveguides
Parameters
Sensors
Silicon
Slot waveguide
Zinc oxide
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Summary:A Silicon waveguide incorporating a vertical slot filled with Al +3 doped ZnO is proposed for gas sensing. The effect of different device parameters, namely, slot-height, slot-width, and Si-width on two key optical features related to sensing, that is, difference in effective index and differential modal loss, before and after the exposure to gas are investigated using a fully-vectoral finite element method. The optimized sensor with a slot height of 400 nm, slot width of 100 nm and Si width of 65 nm yields the effective index difference of ~0.285 and differential loss ~4.35 dB/μm, indicating a viable device for gas sensing applications. Detailed numerical analyses also reveal that, at some structural parameters, two anticrossing modes appear which can significantly alter the device performances and, thus, should be avoided.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2018.2849383