Air-Mode Photonic Crystal Micro-Ring Resonator With Enhanced Quality Factor for Refractive Index Sensing

Xu, Yameng; Hu, Shubo; Kong, Mei

doi:10.1109/jphot.2020.2993603

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…The amount of splitting remained almost constant upon changing the temperature of the chip and the RI of the top cladding, cancelling their effect on the sensor signal. Xu et al [23] have shown a bowtie-hole photonic crystal-based MRR to enhance light-matter interaction and have reported 200 nm RIU −1 sensitivity. A metalassisted Si strip waveguide has been designed in which the inserted thin metal layer under cladding elevates the energy in upper cladding region, providing a maximum RI sensitivity of 300 nm RIU −1 [24].…”

Section: Introductionmentioning

confidence: 99%

Grating assisted temperature insensitive micro-ring resonator biosensor

Kumar Verma,

Kumari,

Mani Tripathi

2023

J. Opt.

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A grating-assisted temperature-insensitive micro-ring resonator bio-sensor is reported using finite-difference time domain simulation method. In addition to choosing a negative thermo-optic coefficient material water to nullify temperature-induced wavelength shift, optimization of the opto-geometric parameters provided a precisely zero-temperature sensitivity state of the structure. The negative thermo-optic coefficient of water counterbalances the positive shift in resonance wavelength originating from Si waveguides. The grating structure delocalizes the core field into the analyte region, which enhances field matter interaction to offer high bulk refractive index (RI) and affinity sensing. The advantage of incorporating grating structure in the ring has been demonstrated by comparing the bulk RI sensitivity and affinity sensitivity with and without the grating structure. Without the circular grating array, the bulk RI sensitivity is 214 nm/RIU and the affinity sensitivity is 0.139 nm/nm. Using grating in the ring structure offers an improved bulk RI sensitivity of 525 nm/RIU and an adlayer sensitivity of 0.515 nm/nm. We calculated the system limit of detection of the structure as ∼2×10−6 RIU. The fabrication tolerance of geometrical parameters, in the form of 10% variation in hole radius and 5% variation in other widths of our sensor, reveals a nominal temperature sensitivity of ∼6 pm/◦C. Changing the cladding analyte from pure water to other aqueous solutions, e.g. urine samples, also has a small impact on temperature sensitivity. The present work is useful in RI-dependent monitoring of the constituents present in aqueous medium-based bio-analytes samples in a variable ambient temperature environment.

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Section: Introductionmentioning

confidence: 99%

Grating assisted temperature insensitive micro-ring resonator biosensor

Kumar Verma,

Kumari,

Mani Tripathi

2023

J. Opt.

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“…To solve this dilemma, many researchers have proposed different optimization schemes for strip waveguide microrings. Ultra-thin waveguide microrings [7], Bragg grating microrings [19,20], slot waveguide microrings [21][22][23], and photonic crystal waveguide microrings [24,25] are utilized to achieve refractive index sensors with sensitivities of 133 nm/RIU [7], 297 nm/RIU [19], 298 nm/RIU [23], and 200 nm/RIU [24], respectively.…”

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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“…In recent years, various structures of MRR sensors have been developed to improve their sensitivity. For example, a one-dimensional photonic crystal MRR with periodic air holes is introduced in a microring waveguide [20][21][22], grating-type MRR [23][24][25], and SMRR [26][27][28][29][30][31][32]. The SMRR introduces an air slot in microring waveguides, where the evanescent field of each individual silicon brick is extremely high, constructively guiding the quasi-TE mode into the slot region to interact with the matter [26].…”

Section: Introductionmentioning

confidence: 99%

Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing

Shi

Chen

Cai

et al. 2022

Sensors

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A novel all-pass slot microring resonator (SMRR), intended for label-free optical biosensing based on silicon-on-insulator platforms, is proposed. The sensor consists of a bent asymmetric directional coupler and an asymmetric-slot microring waveguide. The appropriate slot width of 140 nm is identified by the three-dimensional finite-difference time-domain (3D-FDTD) method for better light–matter interaction in applications. According to numerical calculations, the SMRR sensor with a footprint of 10 µm × 10 µm has a concentration sensitivity of 725.71 pm/% for sodium chloride (NaCl) solutions. The corresponding refractive index sensitivity is 403 nm/RIU (refractive index unit), which is approximately six times greater than that of traditional microring resonator sensors. A low detection limit of 0.129% is also achieved. This SMRR is an excellent candidate for label-free optical biosensors due to its compact structure and excellent sensing capability.

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Air-Mode Photonic Crystal Micro-Ring Resonator With Enhanced Quality Factor for Refractive Index Sensing

Cited by 10 publications

References 26 publications

Grating assisted temperature insensitive micro-ring resonator biosensor

Grating assisted temperature insensitive micro-ring resonator biosensor

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

Compact Slot Microring Resonator for Sensitive and Label-Free Optical Sensing

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