Highly efficient elliptical microcavity refractive index sensor with single detection unit

Vakili, Mahsa; Noori, Mina

doi:10.1007/s11082-019-1804-1

Cited by 7 publications

(4 citation statements)

References 39 publications

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“…Since full three-dimensional calculations require a great amount of memory space and consume a very long time, 3D simulations are reduced to simpler approximated two-dimensional simulations. In this paper, 2D simulation has been done using the effective index of the structure to preserve enough accuracy [40]. 2D FDTD simulation with a grid size of 0.05 of the proposed structure's result is shown in Figure 3.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

High-Sensitive Mid-Infrared Photonic Crystal Sensor Using Slotted-Waveguide Coupled-Cavity

Tayoub¹,

Hocini²,

Harhouz³

2021

PIER M

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In this paper, a novel high-sensitive mid-infrared photonic crystal-based slotted-waveguide coupled-cavity sensor to behave as a refractive index sensing device is proposed at a mid-infrared wavelength of 3.9 µm. We determine the sensitivity of our sensor by detecting the shift in the resonance wavelength as a function of the refractive index variations in the region around the cavity. Comparison shows that mid-infrared photonic crystal-based slotted-waveguide coupled-cavity has higher sensitivity to refractive index changes than mid-infrared photonic crystal-based slotted-waveguide. The sensitivity can be improved from 938 nm/per refractive index unit (RIU) to 1161 nm/RIU within the range of n = 1-1.05 with an increment of 0.01 RIU in the wavelength range of 3.3651 µm to 4.1198 µm by creating a microcavity within the proposed structure, calculated quality factor (Q-factor) of 1.0821 × 10 7 giving a sensor figure of merit (FOM) up to 2.917×10 6 , and a low detection limit of 3.9×10 −6 RIU. Furthermore, an overall sensitivity is calculated to be around S = 1343.2 nm/RIU for the case of higher refractive indices of analytes within the range of n = 1-1.2 with an increment of 0.05 RIU. The described work and the achieved results by performing 2D-finite-difference time-domain (2D-FDTD) simulations confirm the ability to realize a commercially viable miniaturized and highly sensitive mid-infrared photonic crystalbased slotted-waveguide coupled-cavity sensor.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

High-Sensitive Mid-Infrared Photonic Crystal Sensor Using Slotted-Waveguide Coupled-Cavity

Tayoub¹,

Hocini²,

Harhouz³

2021

PIER M

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“…Our designed biosensor can be able to detect the presence of diabetic cells in human tears revealing the highest sensitivity of 688.16 nm RIU −1 , which ascribe to a higher coupling efficiency of the defective ring-shaped microcavity with the waveguide. However, enlarging the detection site would degrade the Q-factor [13]. For all the presented designs, the proposed structure's performance can be changed by increasing the number of functionalized holes around the defective ring-shaped microcavity.…”

Section: Other Biosensor Designsmentioning

confidence: 99%

“…The promising idea of studying and designing biosensors with PhCs has attracted significant interest lately, because of their periodic dielectric structures which may be used to cultivate light waves at the scale of optical wavelength [11] and provide a medium for strong optical confinement and light-matter interaction [12]. PhCs mainly function on the variation of refractive index (RI) and are the most interesting platforms used in sensors for biomedical applications [13]. In this kind of biosensors, a change in RI of the region probed by the resonant mode causes a corresponding shift of the resonant wavelength of the biosensor [14].…”

Section: Introductionmentioning

confidence: 99%

2D photonic crystal biosensing platform based on coupled defective ring-shaped microcavity-two waveguides for diabetes detection using human tears

Tayoub,

Harhouz,

Hocini

2023

Phys. Scr.

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This paper describes a two modes refractive index sensor based on photonic crystals (PhCs) for detecting diabetes in human tears samples. PhC-based biosensors are promising platforms to detect the analyte due to their high sensitivity and selectivity, low cost, and can be easily integrated with other electrical components. The proposed PhC biosensor consists of two waveguides coupled with one defective ring-shaped microcavity, the microcavity was created by removing seven lattice holes and shifting the inner ring-shaped hole vertically down by 0.45a, the whole microcavity system is separated from the two waveguides by three holes. The achieved sensitivity for this device comes out to be 659.83 nm RIU−1. The Q-factor, figure of merit (FOM), and limit of detection (LOD) were about 106, 106 RIU−1,and 10−7 RIU respectively. In general, our results revealed that the proposed device has appreciable potential to be used as a powerful tool to detect diabetes using tears. Furthermore, the proposed biosensor can be used as an alternative to painful pinpricks for diabetes testing. A brief comparison between the presented design and related literatures for detecting diabetes using refractive index biosensors is made to ensure effectiveness and the validity of the proposed biosensor. The high performance and simple design of the proposed biosensor make it a suitable candidate for bio-sensing applications.

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“…To facilitate the material infiltration into the sensing area, RI sensors are mostly presented in the hole‐type PC structures. [ 21 ] By insertion of gas or liquid inside the voids or the change of optical and geometrical characteristics of the PC, band edges and the defect mode is shifted which may be interpreted accordingly to the amount of the affecting physical parameter. [ 22,23 ] The label‐free affinity‐based optical biosensors which detect the selective binding between capture agents and target molecules operate based on the refractive index change induced by molecular binding.…”

Section: Introductionmentioning

confidence: 99%

Self‐Collimation and Slow Light‐Based Refractive Index Sensor with a Large Detection Range

2021

Self Cite

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In this study, a refractive index sensor based on self‐collimation and slow light is presented which operates in the Mid‐IR range (4 µm < λ < 4.133 µm). Here, the square and hexagonal arrays are merged as the background platform and the sensing area, respectively to provide self‐collimation and slow light properties. Three sensors based on slow‐light and self‐collimation are presented in detail which provide Q‐factor, sensitivity, and detection range of 227, 104 nm RIU−1, and 1–1.7, respectively in the best case. Furthermore, the sensor design based on self‐collimation and photonic bandgap phenomena in the background platform and the sensing area, respectively is presented with a single detection unit. The presented sensors are capable of gas or liquid detection with refractive indices in the range of 1–2 with enhanced Q‐factor and sensitivity of over 620 and 123, respectively.

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Highly efficient elliptical microcavity refractive index sensor with single detection unit

Cited by 7 publications

References 39 publications

High-Sensitive Mid-Infrared Photonic Crystal Sensor Using Slotted-Waveguide Coupled-Cavity

High-Sensitive Mid-Infrared Photonic Crystal Sensor Using Slotted-Waveguide Coupled-Cavity

2D photonic crystal biosensing platform based on coupled defective ring-shaped microcavity-two waveguides for diabetes detection using human tears

Self‐Collimation and Slow Light‐Based Refractive Index Sensor with a Large Detection Range

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