Controlling Fano resonances in multilayer dielectric gratings towards optical bistable devices

Hoang, Thu Trang; Ngo, Quang Minh; Vu, Dinh Lam; Nguyen, Hieu Pham Trung

doi:10.1038/s41598-018-34787-9

Cited by 17 publications

(2 citation statements)

References 39 publications

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“…S7 in Supplementary Note 3 for more detail respectively. The standard Fano line shape is the product of interference between a single resonance mode and the continuum background and is given 43 by…”

Section: Resonance Line Shapes and System Efficiencymentioning

confidence: 99%

Ultra-high-Q free-space coupling to microtoroid resonators

Suebka,

McLeod,

2024

Light Sci Appl

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Whispering gallery mode (WGM) microtoroid resonators are one of the most sensitive biochemical sensors in existence, capable of detecting single molecules. The main barrier for translating these devices out of the laboratory is that light is evanescently coupled into these devices though a tapered optical fiber. This hinders translation of these devices as the taper is fragile, suffers from mechanical vibration, and requires precise positioning. Here, we eliminate the need for an optical fiber by coupling light into and out from a toroid via free-space coupling and monitoring the scattered resonant light. A single long working distance objective lens combined with a digital micromirror device (DMD) was used for light injection, scattered light collection, and imaging. We obtain Q-factors as high as $$1.6\times {10}^{8}$$ 1.6 × 10 8 with this approach. Electromagnetically induced transparency (EIT)-like and Fano resonances were observed in a single cavity due to indirect coupling in free space. This enables improved sensing sensitivity. The large effective coupling area (~10 μm in diameter for numerical aperture = 0.14) removes the need for precise positioning. Sensing performance was verified by combining the system with the frequency locked whispering evanescent resonator (FLOWER) approach to perform temperature sensing experiments. A thermal nonlinear optical effect was examined by tracking the resonance through FLOWER while adjusting the input power. We believe that this work will be a foundation for expanding the implementation of WGM microtoroid resonators to real-world applications.

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Section: Resonance Line Shapes and System Efficiencymentioning

confidence: 99%

Ultra-high-Q free-space coupling to microtoroid resonators

Suebka,

McLeod,

2024

Light Sci Appl

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“…They have been also pioneered for the realization of optical fast switching applications [18]. The most studied nonlinear optical switching elements are periodic structures with ability of supporting nonlinear phenomena such as bi(multi) stability and nonreciprocity, which are basis for designing optical diodes, isolators, optical transistors, and so on [19][20][21][22][23][24][25][26]. An inherent issue in these structures is the substantial input intensities required for exciting the nonlinear properties which hinders utilizing them in standard practical applications.…”

Section: Introductionmentioning

confidence: 99%

Design of an agile optical switcher based on a 1D silver plasmonic nanograting filled with a nonlinear Kerr material

Rashidi

Hatef

2023

Phys. Scr.

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In this paper, we investigate the nonlinear optical response characteristics of a metallic nanograting with nonlinear Kerr media within its slits using the finite element method. The proposed nanograting system is illuminated by a nanosecond Gaussian pulse laser under normal incidence and the electric filed pointing across the slits. The results show a perfect linear absorption at resonance wavelength thanks to the coupling of the surface plasmon resonance (SPR) mode and photon cavity mode. We simulate the transient nonlinear absorption variation of the system when the pulse laser is set up at either resonance or off-resonance wavelengths. The results indicate that the unit linear absorption drastically decreases by increasing the laser fluence around the center of the pulse. Interestingly, one can also enhance the weak linear off-resonance absorption to the value of unit by increasing the pulse laser fluence. The higher the laser fluence, the higher the maximum absorption contrast between linear and nonlinear regimes occurs owing to the nonlinear Kerr effect. Indeed, when the laser fluence reaches a critical value, it can excite the Kerr nonlinearity, which changes the coupling strength of SPR mode and the photon cavity mode leading to the absorption adjustment in the nanograting. These properties indicate the possibility of utilizing the proposed nanograting in dual functional absorber and nonabsorber systems, which make it an appropriate candidate for agile optical switching devices.

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Dual high-Q resonance sensing for refractive index and temperature based on all-dielectric asymmetric metasurface

Sun,

Zhao,

et al. 2024

Optics Communications

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Controlling Fano resonances in multilayer dielectric gratings towards optical bistable devices

Cited by 17 publications

References 39 publications

Ultra-high-Q free-space coupling to microtoroid resonators

Ultra-high-Q free-space coupling to microtoroid resonators

Design of an agile optical switcher based on a 1D silver plasmonic nanograting filled with a nonlinear Kerr material

Dual high-Q resonance sensing for refractive index and temperature based on all-dielectric asymmetric metasurface

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