Sense trace gases based surface plasmon polarization waveguide of graphene

Zhu, Jun; Xu, Zhengjie; Hu, Cong; Fu, Deli; De-min, Wei

doi:10.1016/j.measurement.2019.05.005

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…Later, several techniques, namely, using an organic material as a dielectric layer 137 or optimizing graphene's Fermi level, the thickness of the dielectric layer between graphene and waveguides, and probed light frequency, 136 were proposed and demonstrated for achieving the sensors' LODs of as low as a few ppm. In 2019, Zhu et al 94 studied a technique that combines a graphene-based SPR device and cavity ring-down spectroscopy. The LOD of 100 ppm is demonstrated for carbon monoxide (CO) sensing in the telecommunication band.…”

Section: ■ Principles Of On-chip Optical Gas Sensorsmentioning

confidence: 99%

“…To date, a variety of carbon monoxide (CO) sensors and ammonia (NH 3 ) gas sensors have been developed. 48,76,93,94 In 2012 and 2019, Prof. R. Baets's group and Prof. R. Chen's group demonstrated an on-chip optical carbon monoxide sensor 76 and ammonia gas sensor 48 with LODs as low as 3 and 5 ppm, respectively.…”

Section: ■ Principles Of On-chip Optical Gas Sensorsmentioning

confidence: 99%

“…According to OSHA standards, the exposure limits for ammonia (NH 3 ) and carbon monoxide (CO) are 50 ppm and 50 ppm, respectively. To date, a variety of carbon monoxide (CO) sensors and ammonia (NH 3 ) gas sensors have been developed. ,,, In 2012 and 2019, Prof. R. Baets’s group and Prof. R. Chen’s group demonstrated an on-chip optical carbon monoxide sensor and ammonia gas sensor with LODs as low as 3 and 5 ppm, respectively.…”

Section: Applications Of On-chip Optical Gas Sensorsmentioning

confidence: 99%

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On-Chip Optical Gas Sensors Based on Group-IV Materials

Yue

Chen

et al. 2020

ACS Photonics

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Compact and smart optical gas sensors have attracted significant attention over the past few decades. Among the materials used for developing such gas sensors, group-IV materials, including silicon, germanium, carbon allotropes, and their compounds, are considered the most promising candidates. By virtue of their inherent compatibility with the CMOS fabrication process in the mature microelectronics industry, onchip optical gas sensors based on group-IV materials have merits of appreciable sensitivity and high-density integration. Moreover, such sensors have promising potential to be integrated with other electronic or photonic devices for on-chip signal processing and communication, which are expected to enable versatile applications in the internet of things, point-of-care testing, and information and communication technology. This paper is the review of basic principles, state-of-the-art devices, and cutting-edge applications of on-chip optical gas sensors based on group-IV materials and discussions of their prospects.

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Section: ■ Principles Of On-chip Optical Gas Sensorsmentioning

confidence: 99%

Section: ■ Principles Of On-chip Optical Gas Sensorsmentioning

confidence: 99%

Section: Applications Of On-chip Optical Gas Sensorsmentioning

confidence: 99%

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On-Chip Optical Gas Sensors Based on Group-IV Materials

Yue

Chen

et al. 2020

ACS Photonics

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“…Optical switch is an optical device that interconverts or logically operates optical signals in an optical transmission line or integrated optical circuit 1 – 3 Optical switches have important applications in optical telecommunications, 4 , 5 photonic computing, 6 – 8 and fast photonic information processing 9 – 11 In semiconductor materials, the optical refractive index effect is caused by the filling effect of the semiconductor material excited by the photogenerated carriers or the tunnel barrier effect in the multiple quanta well material 12 …”

Section: Introductionmentioning

confidence: 99%

Optical switch of low-insertion-loss based on the Brewster angle effect

Xiong

Zhu

2023

Opt. Eng.

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.Optical switches are critical components for optical communication devices, and currently, they are now bottlenecking the development of optical telecommunications. In this study, we propose an innovative all-optical Kerr switch based on the Brewster angle effect, which exhibits a graphene/SiO2/graphene/SiO2 structure and an insertion loss (IL) that can be minimized by tuning the Fermi level of the graphene layers. A novel Brewster’s angle effect is achieved, resulting in a change in the incidence angle under nonlinear conditions as well as on–off switching of the phase change. The proposed switch has perfect absorption at an incident angle of 63 deg, where the phase of the reflected light is shifted from − π to 0. Furthermore, the Brewster angle of the switch was successfully shifted from 63 deg to 80 deg with an incident frequency of 0.8 THz. It was observed that an increase in Fermi level continuously shrank the nonlinear region of the switch. The minimum IL of the proposed optical switch was only 2 dB, which is indicative of excellent energy efficiency. The results of this study can aid in the development of key devices for broadband communications and electromagnetic sensing.

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“…[11][12][13] Interestingly, SPPs can overcome the diffraction limit of conventional optical microscopy, [14][15][16] and have the characteristics of ultra-fast response and ultra-high sensitivity to the index of refraction of the dielectric employed in the metal-dielectric interface. [17][18][19][20] In this regard, resonators based on Fano resonance are particularly sensitive to the index of refraction owing to its asymmetrical spectral line shape that causes dramatic intensity changes and wavelength shifts in response to small disturbances in the index of refraction. [21][22][23][24][25][26] This has led to increasing attention given to SPP devices based on Fano resonance.…”

Section: Introductionmentioning

confidence: 99%

Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators*

Wu¹,

Zhu²

2021

Chinese Phys. B

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Developing a convenient method that can be routinely applied for ascertaining proportions of different vegetable oils employed in commercial blended edible oils remains a significant challenge. We address this issue by proposing a novel method for detecting volume fraction of different oils based on the fact that these oils are optically transparent and have slightly different indices of refraction at a given temperature and wavelength. Accordingly, we develop a highly sensitive sensor for measuring the index of refraction of oil blends based on Fano resonance spectra obtained using a metal-insulatormetal (MIM) waveguide structure comprising a gapped straight waveguide coupled with two L-shaped resonators. The index of refraction sensitivity and figure of merit of the structure are calculated based on modeling using the finite element method, and the waveguide structure is accordingly optimized by adjusting the different geometric parameters to achieve a high-quality Fano resonance spectrum. The optimized structure achieves an ultra-high refractive index sensitivity of 770 nm/RIU in terms of a refractive index unit (RIU) of 1. Moreover, a highly stable linear relationship is obtained between the refractive index of mixed edible oils and the resonance wavelength. Experimental results demonstrate that the proposed structure can detect slight changes in the volume fractions of the components in blended oils.

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Sense trace gases based surface plasmon polarization waveguide of graphene

Cited by 11 publications

References 13 publications

On-Chip Optical Gas Sensors Based on Group-IV Materials

On-Chip Optical Gas Sensors Based on Group-IV Materials

Optical switch of low-insertion-loss based on the Brewster angle effect

Novel high-quality Fano resonance based on metal-insulator-metal waveguide with L-shaped resonators*

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