scholarly journals Phononic Coupled-Resonator Waveguide Micro-Cavities

2020 ◽  
Vol 10 (19) ◽  
pp. 6751
Author(s):  
Ting-Ting Wang ◽  
Sylwester Bargiel ◽  
Franck Lardet-Vieudrin ◽  
Yan-Feng Wang ◽  
Yue-Sheng Wang ◽  
...  
Keyword(s):  
Elastic Waves ◽  
Phononic Crystal ◽  
Resonant Cavity ◽  
Fused Silica ◽  
Dynamical Response ◽  
Weakly Coupled ◽  
Cavity Modes ◽  
Waveguide Cavities ◽  
Complete Bandgap ◽  
Coupled Resonator

Phononic coupled-resonator waveguide cavities are formed by a finite chain of defects in a complete bandgap phononic crystal slab. The sample is machined in a fused silica plate by femtosecond printing to form an array of cross-shape holes. The collective resonance of the phononic cavities, in the Megahertz frequency range, are excited by a piezoelectric vibrator and imaged by laser Doppler vibrometry. It is found that well-defined resonant cavity modes can be efficiently excited, even though the phononic cavities are distant by a few lattice spacings and are only weakly coupled through evanescent elastic waves. The results suggest the possibility of engineering the dynamical response of a set of coupled phononic cavities by an adequate layout of defects in a phononic crystal slab.

Luminescence and Microstructure of Microspheres Containing Silicon Nanocrystals

2003 ◽  
Vol 777 ◽  
Author(s):  
C.A. Ryan ◽  
A. Meldrum ◽  
C.W. White
Keyword(s):  
Silicon Nanocrystals ◽  
Near Infrared ◽  
Light Emission ◽  
Resonant Cavity ◽  
Fused Silica ◽  
Luminescence Spectra ◽  
Visible Range ◽  
Cavity Modes ◽  
Potential Applications ◽  
Silicon Implantation

AbstractThe strong visible photoluminescence (PL) of silicon nanocrystals has recently been the focus of considerable research interest. Nanocrystal composites produced by silicon implantation of a fused silica wafer followed by high-temperature thermal processing are characterized by a strong, broad photoluminescence spectrum. This light emission, centered in the near infrared and extending well into the visible range, has potential applications for the development of photonic materials based on silicon nanostructures. Here, we report on our attempts to form luminescent silica microspheres containing embedded silicon nanocrystals. Arrays of luminescent microspheres were successfully fabricated, without significant coagulation or destruction of the silica spheres during the silicon ion implantation step. However, a substantial deformation on the surface of the spheres that occurred during the high-flux implantation prevented the development of resonant cavity modes in the luminescence spectra. Resonant modes could clearly be observed for pre-implanted and annealed SiO2 wafers with a layer of pristine microspheres subsequently deposited on the implanted surface. These results suggest an alternative method for producing highly durable luminescent silica “microbeads”. At lower ion fluxes, the development of luminescent microsphere superlattices with novel optical properties due to coupling of the light emission from the silicon nanocrystals into the resonant cavity modes may be possible if the deformation effects can be reduced or eliminated.

Highly directional acoustic wave radiation based on asymmetrical two-dimensional phononic crystal resonant cavity

2006 ◽  
Vol 88 (26) ◽  
pp. 263505 ◽  
Author(s):  
Manzhu Ke ◽  
Zhengyou Liu ◽  
Pei Pang ◽  
Wengang Wang ◽  
Zhigang Cheng ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Phononic Crystal ◽  
Resonant Cavity ◽  
Wave Radiation ◽  
Two Dimensional

scholarly journals Electron shelving of a superconducting artificial atom

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Nathanaël Cottet ◽  
Haonan Xiong ◽  
Long B. Nguyen ◽  
Yen-Hsiang Lin ◽  
Vladimir E. Manucharyan
Keyword(s):  
Quantum Electrodynamics ◽  
Optical Pumping ◽  
Radiative Lifetime ◽  
Resonant Cavity ◽  
Coherence Time ◽  
Fluorescence Signal ◽  
Circuit Quantum Electrodynamics ◽  
Artificial Atom ◽  
Cavity Modes ◽  
Quantum Technology

AbstractInterfacing long-lived qubits with propagating photons is a fundamental challenge in quantum technology. Cavity and circuit quantum electrodynamics (cQED) architectures rely on an off-resonant cavity, which blocks the qubit emission and enables a quantum non-demolition (QND) dispersive readout. However, no such buffer mode is necessary for controlling a large class of three-level systems that combine a metastable qubit transition with a bright cycling transition, using the electron shelving effect. Here we demonstrate shelving of a circuit atom, fluxonium, placed inside a microwave waveguide. With no cavity modes in the setup, the qubit coherence time exceeds 50 μs, and the cycling transition’s radiative lifetime is under 100 ns. By detecting a homodyne fluorescence signal from the cycling transition, we implement a QND readout of the qubit and account for readout errors using a minimal optical pumping model. Our result establishes a resource-efficient (cavityless) alternative to cQED for controlling superconducting qubits.

2D in-plane elastic waves in curved-tapered square lattice frame structure

2021 ◽  
pp. 1-12
Author(s):  
Rajan Prasad ◽  
Ajinkya Baxy ◽  
Arnab Banerjee
Keyword(s):  
Wave Propagation ◽  
Cross Section ◽  
Cross Sections ◽  
Elastic Waves ◽  
Dynamic Stiffness ◽  
Frame Structure ◽  
Square Lattice ◽  
Wave Localization ◽  
Finite Structure ◽  
Complete Bandgap

Abstract This work proposes a unique configuration of two-dimensional metamaterial lattice grid comprising of curved and tapered beams. The propagation of elastic waves in the structure is analyzed using the dynamic stiffness matrix (DSM) approach and the Floquet-Bloch theorem. The DSM for the unit cell is formulated under the extensional theory of curved beam considering the effects of shear and rotary inertia. The study considers two types of variable rectangular cross-sections, viz. single taper and double taper along the length of the beam. Further, the effect of curvature and taper on the wave propagation is analysed through the band diagram along the irreducible Brillouin zone. It is shown that a complete band gap, i.e. attenuation band in all the directions of wave propagation, in a homogeneous structure can be tailored with a suitable combination of curvature and taper. Generation of the complete bandgap is hinged upon the coupling of axial and transverse component of the lattice grid. This coupling emerges due to the presence of the curvature and further enhanced due to tapering. The double taper cross-section is shown to have wider attenuation characteristics than single taper cross-sections. Specifically, 83.36% and 63% normalized complete bandwidth is achieved for the double and single taper cross-section for a homogeneous metamaterial, respectively. Additional characteristics of the proposed metamaterial in time and frequency domain of the finite structure, vibration attenuation, wave localization in the equivalent finite structure are also studied.

Designing a phononic crystal with large-size defect to enhance elastic wave energy localization and harvesting

2021 ◽  
Author(s):  
Xian’e Yang ◽  
Jiahui Zhong ◽  
Jiawei Xiang
Keyword(s):  
Energy Harvesting ◽  
Elastic Waves ◽  
Phononic Crystal ◽  
Defect Mode ◽  
Energy Localization ◽  
Remarkable Effect ◽  
Large Size ◽  
Piezoelectric Energy ◽  
Elastic Wave Energy ◽  
Multiple Cells

Abstract Phononic crystal (PnC) has been proved for its manipulation and amplification of elastic waves. Using this characteristic of PnC to assist energy harvesting has remarkable effect. Generally, defect occurs when unit cell in PnC is replaced by another cell with different geometric or material properties, the output electric power of piezoelectric energy harvesting (PEH) devices will be significantly enhanced. In this study, a cross hole-type PnC-assisted PEH device with a large-size defect is presented by replacing several adjacent multiple cells with other cells. It is found that multiple peak voltages can be created within BG and multimodal energy harvesting can be performed. Compared with the defect mode composed of a small-size defect, energy localization and amplification of the proposed PnC leads to substantially enhancement of harvesting power after tailoring geometric parameters of a PEH device. This work will be expected to design PnC-assisted PEH devices in a reasonable way.

Elastic filter based on coupled resonator waveguides in phononic crystal slabs

2010 ◽  
Author(s):  
Abdelkrim Khelif ◽  
Saeed Mohammadi ◽  
Ali Eftekhar ◽  
Ali Adibi ◽  
Boujemaa Aoubiza
Keyword(s):  
Phononic Crystal ◽  
Coupled Resonator

Phononic Band Gaps in Al2O3/Epoxy Composite

2018 ◽  
Vol 912 ◽  
pp. 112-117 ◽  
Author(s):  
Edson Jansen Pedrosa Miranda Jr. ◽  
J.M.C. dos Santos
Keyword(s):  
Cross Section ◽  
Transverse Vibration ◽  
Elastic Waves ◽  
Epoxy Composite ◽  
Phononic Crystal ◽  
Band Gaps ◽  
Square Lattice ◽  
Plane Wave Expansion ◽  
Phononic Band Gaps ◽  
Angle Of Rotation

In this study, we have investigated the band structure of elastic waves propagating in a phononic crystal, consisting of an epoxy matrix reinforced by Al2O3 inclusions in a square and hexagonal lattices. We also studied the influence of the inclusion geometry cross section – circular, hollow circular, square and rotated square with a 45° angle of rotation with respect to the x, y axes. The plane wave expansion (PWE) method is used to solve the wave equation considering the wave propagation in the xy plane (longitudinal-transverse vibration, XY mode, and transverse vibration, Z mode). The complete band gaps between the XY and Z modes are observed to circular, square and rotated square cross section inclusion and the best performance is for rotated square cross section inclusion in a square lattice. We suggest that the Al2O3/epoxy composite is feasible for vibrations management.

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