Design of an Exceptional-Surface-Enhanced Silicon-On-Insulator Optical Accelerometer

Carlo, Martino De; Leonardis, Francesco De; Soref, Richard A.; Passaro, Vittorio M. N.

doi:10.1109/jlt.2021.3091333

Cited by 20 publications

(12 citation statements)

References 36 publications

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“…For the Bragg grating, the same model used in [35] has been adopted. In particular, the Bragg grating has been realized with a periodic structure made by 450-nm wide and 480-nm wide strip cross-sections, obtaining a grating coupling coefficient κ = 1.8741 • 10 5 m −1 , with a duty cycle of 50%.…”

Section: Numerical Results Of the Es-enhanced Sensormentioning

confidence: 99%

“…In this case, the perturbation to be sensed is represented by the coupling strength κ 2 between the CW and the CCW modes. It is easy to demonstrate that the eigenfrequency splitting between the eigenmodes of this system is proportional to (κ 1 κ 2 ) 1/2 [35].…”

Section: Exceptional-surface-enhanced Particle Sensormentioning

confidence: 87%

“…To overcome this limitation, the concept of ES has been introduced in optics [14], a technique that exploits the unidirectional coupling between two counterpropagating modes in the same cavity to make the system immune to all the sources of noise. By coupling two counterpropagating optical modes in a single resonant cavity, it is possible to make the sensor immune to all the differential perturbations that could affect two distinct cavities; and it is possible to combine robustness with the well-known high sensitivity of EPs for sensing applications [35]. The principle behind the ES is shown in Fig.…”

Section: Exceptional-surface-enhanced Particle Sensormentioning

confidence: 99%

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Design of a Trap-Assisted Exceptional-Surface- Enhanced Silicon-on-Insulator Particle Sensor

Carlo

Leonardis

Soref

et al. 2022

J. Lightwave Technol.

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Due to the recent interest in nanoparticles for both new functionalities and health-and-environment risks-related particle emissions of vehicles and industries, integrated-photonic single-particle sensors are urgently required. Exceptional surfaces (ESs) have been demonstrated to enhance the sensitivity of optical sensors and particle sensing is one of the most promising applications of ESs. The aim of this work is to show an ES-based architecture suitable for sensing the presence of nanoparticles with the aid of particle trapping allowed by optical forces. The solution proposed here enables the particle sensing with a passive architecture on an SOI chip. In this work it is shown that an SOI slot-waveguide-based ring-resonator architecture can be used for sub-50 nm single-particle sensing. Moreover, with a thermo-optic modulator we demonstrate that it is possible to measure the size of the particle, independently of its position along the ring resonator, with robustness to parameter fluctuations and noise.

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Section: Numerical Results Of the Es-enhanced Sensormentioning

confidence: 99%

Section: Exceptional-surface-enhanced Particle Sensormentioning

confidence: 87%

Section: Exceptional-surface-enhanced Particle Sensormentioning

confidence: 99%

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Design of a Trap-Assisted Exceptional-Surface- Enhanced Silicon-on-Insulator Particle Sensor

Carlo

Leonardis

Soref

et al. 2022

J. Lightwave Technol.

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“…The concept of an exceptional surface has been recently investigated in optics in several research works [ 65 , 66 , 67 , 68 , 69 ].…”

Section: Exceptional Surfacementioning

confidence: 99%

Non-Hermitian Sensing in Photonics and Electronics: A Review

Carlo

Leonardis

Soref

et al. 2022

Sensors

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Recently, non-Hermitian Hamiltonians have gained a lot of interest, especially in optics and electronics. In particular, the existence of real eigenvalues of non-Hermitian systems has opened a wide set of possibilities, especially, but not only, for sensing applications, exploiting the physics of exceptional points. In particular, the square root dependence of the eigenvalue splitting on different design parameters, exhibited by 2 × 2 non-Hermitian Hamiltonian matrices at the exceptional point, paved the way to the integration of high-performance sensors. The square root dependence of the eigenfrequencies on the design parameters is the reason for a theoretically infinite sensitivity in the proximity of the exceptional point. Recently, higher-order exceptional points have demonstrated the possibility of achieving the nth root dependence of the eigenfrequency splitting on perturbations. However, the exceptional sensitivity to external parameters is, at the same time, the major drawback of non-Hermitian configurations, leading to the high influence of noise. In this review, the basic principles of PT-symmetric and anti-PT-symmetric Hamiltonians will be shown, both in photonics and in electronics. The influence of noise on non-Hermitian configurations will be investigated and the newest solutions to overcome these problems will be illustrated. Finally, an overview of the newest outstanding results in sensing applications of non-Hermitian photonics and electronics will be provided.

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“…In particular, the development of flexible photonic structures and devices using ultrathin glasses, which are mechanically flexible, has provided a new opportunity in addition to the use of polymer-based materials [11]. Optical sensors are suitable for curvature measurements because of their key features such as light weight, dimensions, electromagnetic interference immunity, harsh environments operability, nontoxic, and high sensitivity [1], [12], [13]. The maximum curvature depends on the thickness of the glass and the presence of surface defects, which are related to the fabrication process [9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Curvature on Flexible Bragg Grating in Off-Axis Core: Theory and Experiment

Anelli

Annunziato

Godfrey

et al. 2023

J. Lightwave Technol.

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A high curvature flexible Bragg grating, in planar technology, is designed, fabricated and experimentally characterized by employing silica glass. The curvature sensing mechanism for slightly off-axis core is theoretically explained and experimentally demonstrated. The electromagnetic behavior of the proposed sensor is investigated through conformal mapping, modal analysis, and coupled-mode theory. The experimental measurement reveals different sensitivities to positive and negative curvatures. The reflection spectrum of the planar Bragg grating sensor and the relationship between its resonant wavelengths and the curvature is measured for a large curvature range up to 𝟏/𝑹 = ± 𝟑𝟑𝒎 −𝟏 . The interest toward off-axis core on planar flexible platform for curvature monitoring is due to the lateral stiffness and low Young's modulus of the substrate.

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Design of an Exceptional-Surface-Enhanced Silicon-On-Insulator Optical Accelerometer

Cited by 20 publications

References 36 publications

Design of a Trap-Assisted Exceptional-Surface- Enhanced Silicon-on-Insulator Particle Sensor

Design of a Trap-Assisted Exceptional-Surface- Enhanced Silicon-on-Insulator Particle Sensor

Non-Hermitian Sensing in Photonics and Electronics: A Review

Effects of Curvature on Flexible Bragg Grating in Off-Axis Core: Theory and Experiment

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