An Ultrasensitive Silicon Photonic Ion Sensor Enabled by 2D Plasmonic Molybdenum Oxide

Ren, G, Zhang, B, Yao, Q, Zavabeti, A, Sanchez Huertas, C, Brkljaca, R, Khan, M, Nili, H, Datta, R, Khan, H, Jannat, A, Walia, S, Haque, F, O'Dell, L, Wang, Y, Zhu, L, Mitchell, A and Ou, J 2019, 'An Ultrasensitive Silicon Photonic Ion Sensor Enabled by 2D Plasmonic Molybdenum Oxide', Small, vol. 15, no. 9, pp. 1-10.

Document type: Journal Article
Collection: Journal Articles

Title An Ultrasensitive Silicon Photonic Ion Sensor Enabled by 2D Plasmonic Molybdenum Oxide
Author(s) Ren, G
Zhang, B
Yao, Q
Zavabeti, A
Sanchez Huertas, C
Brkljaca, R
Khan, M
Nili, H
Datta, R
Khan, H
Jannat, A
Walia, S
Haque, F
O'Dell, L
Wang, Y
Zhu, L
Mitchell, A
Ou, J
Year 2019
Journal name Small
Volume number 15
Issue number 9
Start page 1
End page 10
Total pages 10
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Abstract Silicon photonics has demonstrated great potential in ultrasensitive biochemical sensing. However, it is challenging for such sensors to detect small ions which are also of great importance in many biochemical processes. A silicon photonic ion sensor enabled by an ionic dopant-driven plasmonic material is introduced here. The sensor consists of a microring resonator (MRR) coupled with a 2D restacked layer of near-infrared plasmonic molybdenum oxide. When the 2D plasmonic layer interacts with ions from the environment, a strong change in the refractive index results in a shift in the MRR resonance wavelength and simultaneously the alteration of plasmonic absorption leads to the modulation of MRR transmission power, hence generating dual sensing outputs which is unique to other optical ion sensors. Proof-of-concept via a pH sensing model is demonstrated, showing up to 7 orders improvement in sensitivity per unit area across the range from 1 to 13 compared to those of other optical pH sensors. This platform offers the unique potential for ultrasensitive and robust measurement of changes in ionic environment, generating new modalities for on-chip chemical sensors in the micro/nanoscale.
Subject Electrical and Electronic Engineering not elsewhere classified
Keyword(s) 2D materials
doped semiconductors
integrated optics
ion sensors
silicon photonics
DOI - identifier 10.1002/smll.201805251
Copyright notice © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN 1613-6810
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