We propose an integrated-optical device consisting of a channel waveguide, capable of exciting and collecting Raman-scattered light of surrounding chemicals via the evanescent field, as a new chemical sensing platform.
ISBN:
(纸本)9781557529688
We propose an integrated-optical device consisting of a channel waveguide, capable of exciting and collecting Raman-scattered light of surrounding chemicals via the evanescent field, as a new chemical sensing platform.
Hyperuniform disordered photonic structures/solids (HUDS) are a new class of photonic solids, which display large, isotropic photonic band gaps (PBG) comparable in size to the ones found in photonic crystals (PC). The...
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ISBN:
(纸本)9781628417128
Hyperuniform disordered photonic structures/solids (HUDS) are a new class of photonic solids, which display large, isotropic photonic band gaps (PBG) comparable in size to the ones found in photonic crystals (PC). The existence of large band gaps in HUDS contradicts the long-standing intuition that Bragg scattering and long-range translational order is required in PBG formation, and demonstrates that interactions between Mie-like local resonances and multiple scattering can induce on their own PBGs. HUDS combine advantages of both isotropy due to disorder (absence of long range two-point correlations) and controlled scattering properties from uniform local topology due to hyperuniformity (constrained disorder). In this paper we review the photonic properties of HUDS including the origin of PBGs and potential applicaitons. We address technologically realisable designs of HUDS including localisation of light in point-defect-like optical cavities and the guiding of light in free-form PC waveguide analogues. We show that HUDS are a promising general-purpose design platform for integrated optical micro-circuitry, including active devices such as optical microcavity lasers and modulators.
In this study, we reveal the general mechanism of hidden symmetry protection for surface plasmon polaritons (SPPs). SPPs are protected at zero frequency when the dielectric-metal interface exhibits an exceptional symm...
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In this study, we reveal the general mechanism of hidden symmetry protection for surface plasmon polaritons (SPPs). SPPs are protected at zero frequency when the dielectric-metal interface exhibits an exceptional symmetry. This symmetry is characterized by a combined symmetry operation of mirror reflection and internal transformation regarding the electric and displacement fields. Coalesced monopole- and dipolelike interface fields were identified as the full degrees of freedom of the zero modes. Because symmetry breaking produces conventional SPPs continuously from zero modes, the zero modes are considered the explicit origins of SPPs. Even for nonuniform permittivity distributions, the symmetry protection generally functions. Time-domain simulations demonstrate the excitation of analogous zero modes at a temporal boundary.
We demonstrate a Ta2O5 photonic platform with a propagation loss of 0.5dB/cm and a thermo- optic coefficient of 2.3x10(-6) /K at 1550 nm. The process temperature is below 350 degrees C, friendly to integration with ot...
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ISBN:
(纸本)9798350377583
We demonstrate a Ta2O5 photonic platform with a propagation loss of 0.5dB/cm and a thermo- optic coefficient of 2.3x10(-6) /K at 1550 nm. The process temperature is below 350 degrees C, friendly to integration with other optoelectronic components. (C) 2024 The Author(s)
We demonstrate an MOCVD-grown quasi-symmetric GaN waveguide structure featuring modal phase matching property to generate a second harmonic in the green light spectra range with a central wavelength of 546 nm. The cor...
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ISBN:
(纸本)9798350377330;9798350377323
We demonstrate an MOCVD-grown quasi-symmetric GaN waveguide structure featuring modal phase matching property to generate a second harmonic in the green light spectra range with a central wavelength of 546 nm. The core of the planar waveguide structure is based on GaN polarity inversion, important for an efficient frequency conversion due to improved optical mode field overlap. The spectral characteristics of the picosecond second harmonic generation revealed high homogeneity of the fabricated waveguide structure.
The Line-Edge Roughness (LER) is critical for photonic devices, as it can induce significant optical losses in the data transmission of a PIC (Photonic Integrated Circuit) [1]. Indeed, due to SiO2/Si interface irregul...
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Matrix multiplication with weights is a fundamental operation in deep neural networks, crucial for tasks reliant on data-driven modeling. However, computational limitations often hinder these operations. To address th...
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ISBN:
(纸本)9781510678866;9781510678873
Matrix multiplication with weights is a fundamental operation in deep neural networks, crucial for tasks reliant on data-driven modeling. However, computational limitations often hinder these operations. To address this, we propose photonics neural networks, offering faster processing speeds compared to electronic systems. Our paper aims to develop two distinct photonic neural networks. We use micror-ing resonators as neurons, exploiting their varied transmission properties for weight updates. Our experiments achieved a maximum transmission drop of approximately 0.7 dBm and a maximum spectral shift of around 1 nm per voltage change. Furthermore, we propose and explore two methods for implementing summation and non-linear activation using photonics devices with various materials, investigating the design constraints associated with each approach. Our experimental results corroborate our simulation predictions, validating the feasibility of our designs.
Supersymmetry (SUSY) laser array with superpartner structure can suppress excess modes to achieve high-intensity and high-coherent radiation. Compared with complex superpartner, using parity time (PT) symmetry broken ...
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Supersymmetry (SUSY) laser array with superpartner structure can suppress excess modes to achieve high-intensity and high-coherent radiation. Compared with complex superpartner, using parity time (PT) symmetry broken to manipulate SUSY laser arrays is a more flexible approach. Herein, based on ultrathin perovskite single crystal, a SUSY laser array is constructed without superpartner, but with auxiliary gain-loss structure. PT symmetry broken with high-order exceptional point (EP) is realized in the visible spectral range. It intrinsically avoids superpartner field mismatch and improves side mode suppression ratio 8.8-12 dB for single-mode lasing. Furthermore, variations in EP-order enable the transition from single-mode to dual-mode or tri-mode radiation and retain amplified radiation characteristics. In addition, these SUSY laser arrays with the high-order EP have the potential to be small-volume optical sensor devices. The new design combining SUSY and PT symmetry broken presents its potential in micro-nanophotonic devices with the benefit of small size, flexibility in spectral control, expandability, simplicity, and multifunctionality feature.
We present the first self-referenced fCEO-stabilization based on Si3N4-waveguides, using only 36 pJ of coupled pulse energy. In addition, pump wavelength stabilization leads to record low noise performance of our 1-GH...
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We report the synthesis and characterization of a polymer thin-film structure consisting of two intersecting broad-band optical waveguide lattices, and its performance in wide-angle optical energy collection and conve...
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We report the synthesis and characterization of a polymer thin-film structure consisting of two intersecting broad-band optical waveguide lattices, and its performance in wide-angle optical energy collection and conversion in silicon solar cells. The structures are synthetically organized via the concurrent irradiation of photoreactive polymer blends by two arrays of intersecting, microscale optical beams transmitted through the medium. Through optical beam-induced photopolymerization and photo-polymerization-induced phase separation, well-organized lattices are produced comprising of cylindrical core-cladding waveguide architectures that intersect one another. The optical waveguide properties of the lattices transform the transmission characteristics of the polymer film so that incident optical energy is collected and transmitted along the waveguide axes, rather than their natural directions dictated by refraction, thereby creating efficient light-collecting capability. The embedded structures collectively impart their wide-angle acceptance ranges to enable the film to efficiently collect and interact with light over a large angular range (+/- 70 degrees). When employed as the encapsulant material for a commercial silicon solar cell, the novel light collection and transmission properties result in greater wide-angle conversion efficiency and electrical current density, compared to a single vertically aligned waveguide array. The sustained and greater conversion of light afforded by the encapsulating optical material promises to increase solar cell performance by enabling ultrawide-angle solar energy conversion.
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