Refractive Index Sensing Performances of a Mid-Infrared Asymmetric Mzi Based on Suspended Gaas Waveguides

Wang, Fang; Ma, Shoudao; Ma, Tao; Wang, Xu; Yu, Ke; Li, Lei

doi:10.2528/pierm22033101

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…This guideline enabled the adjustment of sensitivity through the strategic selection of MZI arm lengths, as outlined by the provided data within the research paper. Recently, a unique sensor designed for MIR biochemistry applications was introduced [50]. This sensor employed a configuration featuring two suspended GaAs WGs within an asymmetric MZI setup.…”

Section: Refractive Index Sensing Operationmentioning

confidence: 99%

Racetrack Ring Resonator Integrated with Multimode Interferometer Structure Based on Low-Cost Silica–Titania Platform for Refractive Index Sensing Application

Butt,

Shahbaz,

Piramidowicz

2023

Photonics

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In this work, a racetrack ring resonator (RTRR) integrated with a multimode interferometer (MMI) structure based on a silica–titania (SiO2:TiO2) platform is projected for refractive index sensing application. The typical ring resonator structure requires a gap of ~100 nm to 200 nm between the bus waveguide (WG) and the ring structure which makes it challenging to fabricate a precise device. Thus, the device proposed in this paper can be considered a “gapless” ring resonator structure in which the coupling of light between the ring and bus WG can be achieved via an MMI coupler. A minor change in the refractive index in the vicinity of the MMI structure can trigger a shift in the resonance wavelength of the device. Thus, this simple and fascinating structure can be employed as a refractive index sensor. The device’s sensitivity is ~142.5 nm/RIU in the refractive index range of 1.33 to 1.36 with a figure of merit (FOM) of 78.3. This simple device structure can potentially be fabricated via a low-cost and highly efficient sol–gel process and dip-coating method combined with the nanoimprint lithography (NIL) method.

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Section: Refractive Index Sensing Operationmentioning

confidence: 99%

Racetrack Ring Resonator Integrated with Multimode Interferometer Structure Based on Low-Cost Silica–Titania Platform for Refractive Index Sensing Application

Butt,

Shahbaz,

Piramidowicz

2023

Photonics

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“…The monochromatic interferometers suggested above result in phase ambiguity. This phase ambiguity problem can be resolved by using broadband interferometers where a continuous light of selected wavelength range is used [16,17]. Hence to measure refractive index with great accuracy over a wide spectral range, a broadband Mach-Zehnder interferometer is used as an analytical tool, where some suitable arrangement of sensing and reference waveguides results in sinusoidal TE and TM spectra with substantially different Eigen frequencies.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Estimation of a Planar Optical Waveguide Using Broadband Difference Interferometeric Principle for Detection of Hemoglobin Concentration in Blood

Upadhyay¹,

Yadav²,

Yadav³

et al. 2022

PIER C

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Broadband differences interferometeric analysis of a three-layer planar polymer optical waveguide is proposed and optimized to detect the concentration of hemoglobin in blood. The dispersion characteristic and cutoff film thickness of proposed waveguide are obtained by matching the field at various boundaries. The obtained cutoff film thickness for TE 0 and TM 0 modes is 0.09 µm, 0.1 µm at operating wavelength 400 nm, and 0.19 µm and 0.23 µm at operating wavelength 800 nm, respectively. The effective refractive indices of TE 0 and TM 0 modes are obtained at two considered wavelengths, i.e., 400 nm and 800 nm, and hence the difference of their propagation constant is calculated. It is observed that the propagation constant of these modes decreases with the increase of wavelength. Also, the difference of propagation constant attains its maximum value at certain wavelength and decreases either side of this wavelength. The interference maxima signals at output are considered as sensing signal. The maxima of interference signals, close to the maximum value of propagation constant, are shifted sufficiently with the change in cover refractive index. The maximum sensitivity 3.8 nm/RIU is obtained in the proposed broadband differences interferometeric analysis of waveguide at film thickness 300 nm. Hence, at this film thickness the sensing signal changes by 0.68 nm/g/L of hemoglobin concentration in blood.

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Optical Waveguide Refractive Index Sensor for Biochemical Sensing

et al. 2023

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This study describes the basic principles of optical waveguide refractive index sensing and the various design structures of refractive index sensors. These waveguides generate different optical resonances, which cause changes in the sensing refractive index and temperature and are subsequently used to detect the concentration in the analyses. First, the structural characteristics and performance indices of the microring sensor and interferometer are studied based on the refractive index of the optical waveguide. Second, the principle and sensing detection mechanism of the two types of refractive index sensing employed in these sensors are analyzed. Then, the two sensors are classified and discussed from the perspective of the waveguide materials and structures, as well as the substances to be measured. Simultaneously, performance indicators such as sensitivity and detection range are compared and summarized. The comparison results show that there is a compromise between the sensitivity and quality factor of the optical waveguide refractive index sensor. Finally, applications of refractive index sensing in the biochemical field for material detection are discussed, showing that the optical waveguide refractive index sensor has significant advantages over other types of biochemical optical sensors.

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Refractive Index Sensing Performances of a Mid-Infrared Asymmetric Mzi Based on Suspended Gaas Waveguides

Cited by 3 publications

References 33 publications

Racetrack Ring Resonator Integrated with Multimode Interferometer Structure Based on Low-Cost Silica–Titania Platform for Refractive Index Sensing Application

Racetrack Ring Resonator Integrated with Multimode Interferometer Structure Based on Low-Cost Silica–Titania Platform for Refractive Index Sensing Application

Sensitivity Estimation of a Planar Optical Waveguide Using Broadband Difference Interferometeric Principle for Detection of Hemoglobin Concentration in Blood

Optical Waveguide Refractive Index Sensor for Biochemical Sensing

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