Tailoring the Parameters to Increase the Efficiency of a Micro-Ring Resonator Sensor for Biosensing
01 Jan 2019-Vol. 41, pp 477-485
TL;DR: In this paper, a vertically coupled micro-ring resonator for biosensing is studied, and the effects of structural parameters of the resonator to increase the efficiency of the sensor are analyzed.
Abstract: Photonic micro-ring resonators can be used as sensor which finds promising bio-analytical applications. The light propagating through the micro-ring and the resultant evanescent field beyond the structure are sensitive to the refractive index of the environment. This sensing capability can be used for detection of biological targets. In this paper, a vertically coupled micro-ring resonator for biosensing is studied. Silicon-on-insulator (SOI) based resonator is preferred for its high index contrast, low cost, and compatibility. Analytical derivations and computations are done to study the effects of structural parameters of the resonator to increase the efficiency of the sensor.
Citations
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03 Jan 2021-Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems
TL;DR: In this article, the authors proposed a high r.i.d. contrast silicon-on-insulator (SOI) microring resonator to improve the efficiency of bio-sensing.
Abstract: In this paper, design strategies for enhancement of efficiency for biosensing using optical microring resonator are described. Medical diagnostics play a crucial role in healthcare as it aims to provide early diagnosis of diseases. This urges the need to design an efficient point-of-care diagnostics to improve healthcare technologies. Among the existing biosensors, microring resonator based dielectric waveguide integrated biosensors possess a promising performance. The evanescent fields generated due to propagation of light extends beyond the structure and serves as the sole reason for field sensing. In this study, couple of strategies are addressed to design high r.i. contrast silicon-on-insulator (SOI) microring resonator to improve the efficiency of bio-sensing. The first strategy emphasizes on reducing resonator height for enhanced evanescence as sensing applications solely lie on evanescent fields. In the other approach, the conventional air-cladded waveguide coupling is replaced by the oxide-based waveguide coupling which results in higher coupling and higher Q-factor due to lowered index difference between the core and the cladding materials.
2 citations
17 Jun 2020
TL;DR: Biosensors are revolutionizing the modern healthcare and diagnostics with new biosensing techniques being developed that offer high sensitivity, selectivity and zero exposure to harmful radiations.
Abstract: Emerging technologies are always critical for the growth and development of human understanding. Biosensing is rapidly evolving and integrating with a number of existing technologies leading to the emergence of new set of tools that can redefine our society. New biosensing techniques are being developed that offer high sensitivity, selectivity and zero exposure to harmful radiations. Biosensors are revolutionizing the modern healthcare and diagnostics
1 citations
Cites background from "Tailoring the Parameters to Increas..."
...Interferometric biosensors [8] work on the principle of optical light interference....
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01 Jan 2021
TL;DR: Laterally coupled microring resonators have been used for biological and chemical sensing in this article, where a laterally coupled silicon-on-insulator (SOI) based resonator has been proposed for biosensing applications.
Abstract: Sensors used for biological and chemical sensing have been active research topics because of several potential applications like medical diagnostics, environment monitoring, etc. Among the existing sensors, integrated optical waveguides based sensors making use of photonic microring resonators possess a promising performance. When light propagates through the microring, it generates an evanescent field that extends beyond the structure which is sensitive to the refractive index of the analytes adsorbed on its surface, and it modulates the resonant wavelength of light within the cavity. This sensing capability has been utilized for the detection of biological targets and facilitates label-free detection. This paper presents the design of a laterally coupled microring resonator having high sensitivity for biosensing applications. Silicon-on-Insulator (SOI) based resonator is preferred because of its small size, low cost and high sensitivity. Simulation results are done to validate with the existing design structures and propose smaller dimension structure that can still achieve high sensing efficiency of the order of 10–8 RIU.
1 citations
References
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TL;DR: An overview of the current state-of-the-art in silicon nanophotonic ring resonators is presented in this paper, where the basic theory of ring resonance is discussed and applied to the peculiarities of submicron silicon photonic wire waveguides: the small dimensions and tight bend radii, sensitivity to perturbations and the boundary conditions of the fabrication processes.
Abstract: An overview is presented of the current state-of-the-art in silicon nanophotonic ring resonators. Basic theory of ring resonators is discussed, and applied to the peculiarities of submicron silicon photonic wire waveguides: the small dimensions and tight bend radii, sensitivity to perturbations and the boundary conditions of the fabrication processes. Theory is compared to quantitative measurements. Finally, several of the more promising applications of silicon ring resonators are discussed: filters and optical delay lines, label-free biosensors, and active rings for efficient modulators and even light sources.
1,989 citations
TL;DR: In this paper, the authors give an overview of recent progress in passive spectral filters and demultiplexers based on silicon-on-insulator photonic wire waveguides: ring resonators, interferometers, arrayed waveguide gratings, and echelle diffraction gratings.
Abstract: We give an overview of recent progress in passive spectral filters and demultiplexers based on silicon-on-insulator photonic wire waveguides: ring resonators, interferometers, arrayed waveguide gratings, and echelle diffraction gratings, all benefit from the high-index contrast possible with silicon photonics. We show how the current generation of devices has improved crosstalk levels, insertion loss, and uniformity due to an improved fabrication process based on 193 nm lithography.
470 citations
TL;DR: The first experimental demonstration of anomalous group-velocity dispersion (GVD) in silicon waveguides across the telecommunication bands is presented and it is shown that the GVD can be tuned from -2000 to 1000 ps/(nm*km) by tailoring the cross-sectional size and shape of the waveguide.
Abstract: We present the first experimental demonstration of anomalous group-velocity dispersion (GVD) in silicon waveguides across the telecommunication bands. We show that the GVD in such waveguides can be tuned from -2000 to 1000 ps/(nm·km) by tailoring the cross-sectional size and shape of the waveguide.
419 citations
TL;DR: In this paper, a biosensor application of vertically coupled glass microring resonators with Q/spl sim/12 000 was introduced using balanced photodetection, very high signal to noise ratios, and thus high sensitivity to refractive index changes.
Abstract: A biosensor application of vertically coupled glass microring resonators with Q/spl sim/12 000 is introduced. Using balanced photodetection, very high signal to noise ratios, and thus high sensitivity to refractive index changes (limit of detection of 1.8/spl times/10/sup -5/ refractive index units), are achieved. Ellipsometry and X-ray photoelectron spectroscopy results indicate successful modification of biosensor surfaces. Experimental data obtained separately for a bulk change of refractive index of the medium and for avidin-biotin binding on the ring surface are reported. Excellent repeatability and close-to-complete surface regeneration after binding are experimentally demonstrated.
400 citations
TL;DR: In this paper, a number of compact wavelength-selective elements implemented in silicon-on-insulator (SOI) photonic wires are presented, including arrayed waveguide gratings (AWGs), Mach-Zehnder lattice filters (MZLFs), and ring resonators.
Abstract: We present a number of compact wavelength-selective elements implemented in silicon-on-insulator (SOI) photonic wires. These include arrayed waveguide gratings (AWGs), Mach-Zehnder lattice filters (MZLFs), and ring resonators. The circuits were fabricated with deep UV lithography. We also address the sensitivity of photonic wires to phase noise by selectively broadening the waveguides, and demonstrate this in a compact AWG with -20 dB crosstalk and an insertion loss of 2.2 dB for the center channels
350 citations