A Miniature On-Chip Methane Sensor Based on an Ultra-Low Loss Waveguide and a Micro-Ring Resonator Filter

Qiao, Yiting; Tao, Jifang; Chen, Chia-Hung; Qiu, Jifang; Tian, Ye; Hong, Xiaobin; Wu, Jian

doi:10.3390/mi8050160

Cited by 13 publications

(4 citation statements)

References 17 publications

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“…The decay in power can be expressed according to Lambert-Beer's law [32][33][34], which normally depends on the gas concentration, length, and EFR of the WG. That is why EFR is a vital parameter for the apprehension of gas sensors based on the evanescent field absorption [35,36]. EFR is the ratio of the intensity integration of the desired region (upper cladding + nano-slot) and overall intensity integration of the WG structure which is expressed as EFR of the TE and TM hybrid modes largely depends on the WG geometry.…”

Section: Evanescent Field Ratio Analysis Of the Hpwgmentioning

confidence: 99%

Polarization-Insensitive Hybrid Plasmonic Waveguide Design for Evanescent Field Absorption Gas Sensor

2020

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We propose a polarization-insensitive design of a hybrid plasmonic waveguide (HPWG) optimized at the 3.392 µm wavelength which corresponds to the absorption line of methane gas. The waveguide design is capable of providing high mode sensitivity (Smode) and evanescent field ratio (EFR) for both transverse electric (TE) and transverse magnetic (TM) hybrid modes. The modal analysis of the waveguide is performed via 2-dimension (2D) and 3-dimension (3D) finite element methods (FEMs). At optimized waveguide parameters, Smode and EFR of 0.94 and 0.704, can be obtained for the TE hybrid mode, respectively, whereas the TM hybrid mode can offer Smode and EFR of 0.86 and 0.67, respectively. The TE and TM hybrid modes power dissipation of ~3 dB can be obtained for a 20-µm-long hybrid plasmonic waveguide at the 60% gas concentration. We believe that the highly sensitive waveguide scheme proposed in this work overcomes the limitation of the polarization controlled light and can be utilized in gas sensing applications.

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Section: Evanescent Field Ratio Analysis Of the Hpwgmentioning

confidence: 99%

Polarization-Insensitive Hybrid Plasmonic Waveguide Design for Evanescent Field Absorption Gas Sensor

2020

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“…The LOP-DAST can be described as follows. According to the Beer-Lambert law, absorbance is proportional to the concentrations of the attenuating species in the material sample [14,15,16,17,18]. The light intensity after passing through the gas absorption cell with light path length L is: I(λ)=I0(λ)exp(ϕ(σi,Ci,L,εr,εm))…”

Section: Detection Principle Of Co Using Lop-dastmentioning

confidence: 99%

A Trace Carbon Monoxide Sensor Based on Differential Absorption Spectroscopy Using Mid-Infrared Quantum Cascade Laser

et al. 2018

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Carbon monoxide (CO), as a dangerous emission gas, is easy to accumulate in the complex underground environment and poses a serious threat to the safety of miners. In this paper, a sensor using a quantum cascade laser with an excitation wavelength of 4.65 μm as the light source, and a compact multiple reflection cell with a light path length of 12 m is introduced to detect trace CO gas. The sensor adopts the long optical path differential absorption spectroscopy technique (LOP-DAST) and obtains minimum detection limit (MDL) of 108 ppbv by comparing the residual difference between the measured spectrum and the Voigt theoretical spectrum. As a comparison, the MDL of the proposed sensor was also estimated by Allan deviation; the minimum value of 61 ppbv is achieved while integration time is 40 s. The stability of the sensor can reach 2.1 × 10−3 during the 2 h experimental test and stability of 1.7 × 10−2 can still be achieved in a longer 12 h experimental test.

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“…Antibiotics are a newly identified but particularly dangerous variety of water pollutant. Their threat stems from the potential adverse effects on non-target organisms and an increased bacterial resistance [7]. In 2020, the countries with the highest antibiotic consumption rates were China (43,024 tonnes), Brazil (7533 tonnes) and the United States (6596 tonnes) [8].…”

Section: Introductionmentioning

confidence: 99%

Physiological and Biochemical Parameters of Common Duckweed Lemna minor after the Exposure to Tetracycline and the Recovery from This Stress

et al. 2021

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In this study, the ability of Lemna minor L. to recover to normal growth, after being degraded in a tetracycline-containing medium, was extensively investigated. The plants were exposed to tetracycline (TC) at concentrations of 1, 2.5, and 10 mM. Subsequently, their physiological status was analysed against the following criteria: rate of plant growth; free radical accumulation; antioxidant enzyme activity; chlorophyll content; HSP70 protein content; cell membrane permeability, and mitochondrial activity. The study showed that duckweed can considerably recover from the damage caused by antibiotics, within a week of cessation of stress. Of the plant properties analysed, mitochondrial activity was the most sensitive to antibiotic-induced disturbances. After transferring the plants to a tetracycline-free medium, all plant parameters improved significantly, except for the mitochondrial activity in the plants grown on the medium containing the highest dose of tetracycline. In the plants treated with this antibiotic at the concentration of 10 mM, the proportion of dead mitochondria increased and was as high as 93% after one week from the beginning of the recovery phase, even after the transfer to the tetracycline-free medium.

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A Miniature On-Chip Methane Sensor Based on an Ultra-Low Loss Waveguide and a Micro-Ring Resonator Filter

Cited by 13 publications

References 17 publications

Polarization-Insensitive Hybrid Plasmonic Waveguide Design for Evanescent Field Absorption Gas Sensor

Polarization-Insensitive Hybrid Plasmonic Waveguide Design for Evanescent Field Absorption Gas Sensor

A Trace Carbon Monoxide Sensor Based on Differential Absorption Spectroscopy Using Mid-Infrared Quantum Cascade Laser

Physiological and Biochemical Parameters of Common Duckweed Lemna minor after the Exposure to Tetracycline and the Recovery from This Stress

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