Refractive index biosensor based on topological ring resonator

Liu, Na; Wang, Shutao; Lv, Jiangtao; Lu, Yuhong; Zhang, Jinqing

doi:10.1016/j.optcom.2023.129542

Cited by 4 publications

(3 citation statements)

References 48 publications

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“…In recent times, TPCs are studied in the microwave domain to meet various promising applications, including topological waveguides [38,39], delay lines [40], and integrated photonic devices [41]. The robustness of these topological systems has been examined in the presence of various structural/lattice imperfections, including point defect [42], line defects [43], sharp bends [44][45][46], lattice defects [26], etc. However, these studies include either the introduction of defect states around the topological channel or the reconstruction of the topological channel in various forms (Z, Ω), which have little influence on the traveling edge states due to its valley-locked propagation [19,26,47].…”

Section: Introductionmentioning

confidence: 99%

External defect immune high quality resonances in microwave topological ring resonator

Jena,

Kulkarni,

Varshney

et al. 2024

J. Phys. D: Appl. Phys.

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Recently, topological ring resonators (TRRs) have emerged as a burgeoning platform for exploring the topological aspects of photonic systems and resonator dynamics. Integrating topology into cavity dynamics offers a new paradigm to unveil various fascinating phenomena, including backscattering immune wave propagation, unidirectional transmission, and reflection-free energy transport. With this background, we provide a scheme to achieve robust high Q resonances in a metal-based topological photonic crystal (TPC) exhibiting defect-immune spectral characteristics in the microwave frequency regime. Coupled with a ring resonator, our proposed topological platform demonstrates the excitation of high Q resonances in the range 230-540. Except for the resonances, a robust microwave transmission (~0 dB) is observed in the investigated frequency regime 7.1-7.6 GHz, depicting a minimal scattering loss even around the sharp corners of the ring resonator. Further, the topological robustness of the propagating microwave and the excited resonances are examined by introducing an external Si obstacle at the domain interface. Our study reveals a minimal transmission loss (<7 dB) and negligible perturbation (<8%) in the Q factors when the Si barrier placed towards the input end of the straight topological waveguide. In addition, we have also demonstrated a novel way of exciting new resonances in the ring resonator that holds considerable promise for designing a TRR-based all-pass notch filter in the microwave regime.

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Section: Introductionmentioning

confidence: 99%

External defect immune high quality resonances in microwave topological ring resonator

Jena,

Kulkarni,

Varshney

et al. 2024

J. Phys. D: Appl. Phys.

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“…Also, Bahadoran et al 1 , using double-slot-waveguide based MRR, presented a biosensor with a QF and S above 524 and 248 nm/RIU respectively. Liu et al 34 , presented a PC topological MRR biosensor for detecting of hemoglobin concentration. In this research the QF and S has been reported 1256 and 798 nm/RIU respectively.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity and quality factor improvement of photonic crystal sensors by geometrical optimization of waveguides and micro-ring resonators combination

Fallahi,

Kordrostami,

Hosseini

2024

Sci Rep

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In this work, the process of designing and simulating optical sensors based on photonic crystal (PC) micro-ring resonators (MRRs) has been investigated. According to the PC type, different waveguides and resonators can be designed, and various topologies can be proposed from their combination, for optical sensor applications. Here, the investigated MRR is of the symmetrical micro-hexagonal ring resonator (MHRR) type. Different arrays of MHRR arrangement have been designed to investigate their effects on the output spectrum. The results of the design and simulation of different topologies have been analyzed and compared with other numerical researches. Considering all the necessary aspects of PC optical sensors, a detailed and comprehensive algorithm has been presented for designing these devices and choosing the optimal structure. In a more complementary process, the effects of reflector rods have been investigated, which indicates the existence of similarity and compatibility in the design between the distance of reflector rods and the length of MHRRs to obtain the optimal structure. Finally, the effect of different values of lattice constant and radius of dielectric rods on FWHM, transmission (TR) and resonant wavelength is studied, and the most optimal mode is presented. In order to measure the performance of the proposed optimal sensor, its application for gas detection has been analyzed. TR, FWHM, quality factor (QF), sensitivity (S) and figure of merit (FOM) of the proposed sensor were equal to 96%, 0.31 nm, 2636, 6451 nm/RIU and 2960 RIU−1 respectively. An examination of results from similar research indicates a rational and effective approach for generating diverse topologies, aiming to attain the most optimal configuration for optical sensors employing MRRs. Furthermore, employing a systematic design process based on established principles and the proposed algorithm helps prevent arbitrary parameter variations, facilitating the attainment of desired outcomes in a more streamlined and efficient manner. Given the comprehensive nature of this research, it presents a viable solution for designing optical devices based on MRRs for use in optical integrated circuits (OICs) applications.

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“…Topological photonics employs the principles and techniques of topology in exploring the transportation and manipulation of photons. Through the design and fabrication of photonic crystals and other materials with distinct topological configurations, it is possible to achieve attributes such as unidirectional photon propagation, anti-scattering, and topological protection [1][2][3][4]. These characteristics lead to innovative approaches and techniques to enhance the design and performance of photonic devices.…”

Section: Introductionmentioning

confidence: 99%

Topological Photonic Crystal in Microwave Region Based on Coupled Superconducting Resonators

Zheng,

Chang,

Huang

et al. 2024

Symmetry

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Topological photonics has been widely investigated due to its profound physical significance and great number of potential applications. Microwaves have long wavelengths, so it is relatively easy to manufacture large-sized microwave photonic crystals, enabling researchers to observe and measure phenomena such as topological boundary states. Nevertheless, the quality factors (QFs) of most resonators composed of traditional materials in the microwave region are relatively low, leading to topological edge states with high decay rates. In this study, we present a one-dimensional topological photonic crystal in the microwave region based on coupled superconducting resonators. A topological state with a QF as high as 6000 is observed, which proves this to be a new platform for the investigation of topological photonics with low decay rates in the microwave regime.

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Refractive index biosensor based on topological ring resonator

Cited by 4 publications

References 48 publications

External defect immune high quality resonances in microwave topological ring resonator

External defect immune high quality resonances in microwave topological ring resonator

Sensitivity and quality factor improvement of photonic crystal sensors by geometrical optimization of waveguides and micro-ring resonators combination

Topological Photonic Crystal in Microwave Region Based on Coupled Superconducting Resonators

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