Proposal and analysis of ultra-high amplitude-sensitive refractive index sensor by thick silicon multi-slot sub-wavelength Bragg grating waveguide

Heinsalu, Siim; Isogai, Yuji; Kawano, Anna; Matsushima, Yuichi; Ishikawa, Hiroshi; Utaka, Katsuyuki

doi:10.1016/j.optcom.2021.127533

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…The high interacting field leads to a high sensitivity. Over the years, various photonic structures have been proposed such as surface Plasmon polaritons (SPPs) [ 17 , 18 ], 2D materials [ 19 , 20 ], long period gratings (LPGs) [ 21 , 22 ], multimode interferences [ 23 ], ring resonators [ 24 , 25 ], Bragg gratings [ 26 , 27 , 28 , 29 , 30 , 31 ], etc. The performance of the structures based on LPGs, SPPs, multimode interferometers, and ring resonators is often limited by broad bandwidth, a bulky setup, or a free spectral range.…”

Section: Introductionmentioning

confidence: 99%

“…However, an extra photosensitive cladding layer has been considered on top of the silicon waveguide to form the grating that hinders the participating mode from directly interacting with the ambient medium. In order to further expose the core mode to the sensing medium, Sub Wavelength Grating (SWG) geometry has been utilized with laterally loaded blocks as the Bragg grating [ 28 , 29 ]. In SWGs, in addition to the evanescent field, a part of the guiding power in the core also interacts with the sensing medium.…”

Section: Introductionmentioning

confidence: 99%

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Highly Sensitive Refractive Index Sensor Based on Polymer Bragg Grating: A Case Study on Extracellular Vesicles Detection

Saha

Brunetti

Kumar³

et al. 2022

Biosensors

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The measurement of small changes in the refractive index (RI) leads to a comprehensive analysis of different biochemical substances, paving the way to non-invasive and cost-effective medical diagnosis. In recent times, the liquid biopsy for cancer detection via extracellular vesicles (EV) in the bodily fluid is becoming very popular thanks to less invasiveness and stability. In this context, here we propose a highly sensitive RI sensor based on a compact high-index-coated polymer waveguide Bragg grating with a metal under cladding. Owing to the combined effect of a metal under cladding and a high-index coating, a significant enhancement in the RI sensitivity as well as the dynamic range has been observed. The proposed sensor has been analyzed by combining finite element method (FEM) and coupled-mode theory (CMT) approaches, demonstrating a sensitivity of 408–861 nm/RIU over a broad dynamic range of 1.32–1.44, and a strong evanescent field within a 150 nm proximity to the waveguide surface compliant with EV size. The aforementioned performance makes the proposed device suitable for performing real-time and on-chip diagnoses of cancer in the early stage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Refractive Index Sensor Based on Polymer Bragg Grating: A Case Study on Extracellular Vesicles Detection

Saha

Brunetti

Kumar³

et al. 2022

Biosensors

View full text Add to dashboard Cite

show abstract

“…Over the past few decades, integrated label-free optical sensors have been extensively studied, such as micro-ring resonator sensors [4][5][6], MZI sensors [7,8], Fabry-Pero resonator sensors [9], surface plasmon sensors [10][11][12], slot waveguide sensors [13], and grating sensors [14]. The MZI structure sensor is one of the well-known label-free optical sensing devices, which has the advantages of high refractive index sensitivity, strong anti-interference ability, and high detection efficiency [15,16], so we chose the MZI structure design sensor and then observe the wavelength offset of the decay peaks in the transmission spectrum.…”

Section: Introductionmentioning

confidence: 99%

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

Wang¹,

Ma²,

Ma³

et al. 2022

PIER M

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A novel mid-infrared (MIR) biochemistry sensor using two suspended GaAs waveguides based on an asymmetric Mach-Zender Interferometer (MZI) is proposed. The propagation properties and refractive index (RI) sensing performances of MZI are investigated by the finite element method (FEM). The simulation results show that the maximum waveguide sensitivities (S wg ) of the TE and TM modes in the suspended GaAs waveguide are ∼ 1.2 and ∼ 1.0. This design of the GaAs waveguide using the suspension structure is to enhance the interaction between the vanishing field and measured material. The RI sensitivity of the asymmetric MZI structure increases with the length of the sensing arm, which can reach 854.5 nm/RIU with a Q of 208.2 after parameter optimization. The two arms of the MZI are designed as width-asymmetric structures to make the sensor more sensitive to the measured material. The asymmetric MZI sensing structure has high RI sensitivity and compact structure, which provides a feasible scheme for biochemical sensing.

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Gas refractive index sensor with an integrated prism and a microlens array

Wei

Sze

2023

Optik

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Proposal and analysis of ultra-high amplitude-sensitive refractive index sensor by thick silicon multi-slot sub-wavelength Bragg grating waveguide

Cited by 8 publications

References 17 publications

Highly Sensitive Refractive Index Sensor Based on Polymer Bragg Grating: A Case Study on Extracellular Vesicles Detection

Highly Sensitive Refractive Index Sensor Based on Polymer Bragg Grating: A Case Study on Extracellular Vesicles Detection

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

Gas refractive index sensor with an integrated prism and a microlens array

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