Ultrahigh <i>Q</i>-Factor and Ultrasensitive Refractive Index Sensor Based on a Multiple-Slot Photonic Crystal Cavity

Saha, Partha; Sen, Mrinal K.

doi:10.1109/tim.2020.3036051

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…The refractive index sensor converts the small change of the refractive index into an optical signal, and realizes the sensing through the interaction of light and biochemical substances on the surface of the superstructure. With the development of technology, optical sensors have developed from the original four basic optical refractive index sensors: metal-based propagation eigenmode refractive index sensors, [1][2][3] metal-based local eigenmode refractive index sensors, [4,5] dielectric propagation eigenmode refractive index sensors, [6][7][8] and dielectric local eigenmode refractive index sensors [9,10] to more advanced hybrid optical refractive index sensors.…”

Section: Introductionmentioning

confidence: 99%

High‐Sensitivity Thin‐Film Grating Absorbers for Sensing Applications

Sun

Shen

Zheng

et al. 2023

Physica Status Solidi (b)

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Herein, based on the finite‐element calculation method, a high‐sensitivity infrared absorption sensor is designed with ZnSe as the substrate, Mo as the waveguide layer and periodic grating, and Ge as the thin film. The absorption performance of the structure is not sensitive to the polarization of the incident light when the transverse‐magnetic light wave is perpendicular to the structure. The thickness of the Ge thin film and the width of the grating column are the main factors for determining its absorption and sensing performance. The optimized structure is sensitive to the refractive index on the grating. Herein, a correspondence between the refractive index change and the position of the peak of the absorbance spectrum is established. When this structure is used as a refractive index sensor, the sensitivity can reach 2300 nm RIU−1 with a high figure of merit of 37.09. In addition, temperature sensing in ethanol shows that the waveguide can quantify the solution temperature by resonance. It is demonstrated in the results that the grating absorber has great potential applications in biomedical sensing.

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Section: Introductionmentioning

confidence: 99%

High‐Sensitivity Thin‐Film Grating Absorbers for Sensing Applications

Sun

Shen

Zheng

et al. 2023

Physica Status Solidi (b)

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“…N recent years, owing to the dominant advantages of high refractive index contrast and complementary metal oxide semiconductor (COMS)-compatibility [1][2][3], many devices based on silicon-on-insulator (SOI) platform, have been utilized to design refractive index sensors, such as microdisk resonators [4][5][6], microring resonators (MRR) [7][8][9][10][11][12], and photonic crystal Li Liu is with School of Automation, China University of Geosciences, Wuhan 430074, China, and also with Hubei Key Laboratory of Advanced cavities [13][14][15][16]. In particular, microring resonators have been extensively investigated as silicon photonic refractive index sensors due to their design simplicity and ease of fabrication [17,18].…”

Section: Introductionmentioning

confidence: 99%

On-Chip Refractive Index Sensor With Ultra-High Sensitivity Based on Sub-Wavelength Grating Racetrack Microring Resonators and Vernier Effect

Liu

et al. 2022

IEEE Photonics J.

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An approach to optimize the sensitivity and the limit of detection of on-chip refractive index sensor is proposed and demonstrated based on sub-wavelength grating racetrack microring resonator and Vernier effect. The sub-wavelength grating waveguide can reduce the structure limitation of the light field, which is beneficial to enhancing the interaction between the photon and analyte. By optimizing the parameters of the subwavelength grating racetrack microring resonator, the sensitivity of the sensor could be significantly improved to 664 nm/RIU. Subsequently, capitalizing the Vernier effect, a two cascaded microring-based refractive index sensor is designed. Owing to the Vernier effect, the wavelength spacings among the overlapped peaks could be effectively amplified more than ten times, leading to a high performance. The results demonstrate that an ultra-high sensitivity of 7061 nm/RIU and a low limit of detection of 1.74× 10 −5 RIU. With the advantages of ultra-high sensitivity and low limit of detection, the integrated device has important value in the fields of environmental monitoring and biosensors.

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