Single-Mode Generation of Quantum Photon States by Excited Single Molecules in a Microcavity Trap

1996 ◽  
Vol 76 (6) ◽  
pp. 900-903 ◽  
Author(s):  
F. De Martini ◽  
G. Di Giuseppe ◽  
M. Marrocco
Keyword(s):  
Single Molecules ◽  
Single Mode ◽  
Photon States ◽  
Mode Generation

Selective generation of ultrasonic guided waves for damage detection in rectangular bars

2020 ◽  
pp. 147592172094740
Author(s):  
Valentin Serey ◽  
Nicolas Quaegebeur ◽  
Mathieu Renier ◽  
Philippe Micheau ◽  
Patrice Masson ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Guided Waves ◽  
Infinite Plate ◽  
Laser Doppler Vibrometer ◽  
Single Mode ◽  
Ultrasonic Guided Waves ◽  
Structural Health ◽  
Selective Generation ◽  
Mode Generation

Ultrasonic guided waves are used in non-destructive testing and structural health monitoring solutions for long-range inspection, in applications ranging from Civil Engineering to Aerospace. In order to ease the inspection process, it is generally preferable to generate a carefully selected single mode. Although single mode Lamb wave generation is not difficult to achieve in infinite plate-like structures, with carefully polarized or sized piezoceramic elements, for example, such selective generation is much more difficult in a rectangular bar. In this article, we consider the propagation along a thin plate of finite rectangular cross section, which corresponds to a rectangular bar. The finite lateral width leads to a greater density of modes compared to an infinite plate. The authors have previously addressed this matter and developed a methodology for the selective generation of modes in the harmonic regime. This article extends this methodology to selective mode generation for finite time excitation, such as bursts. Results are presented for single mode generation of A0,0 and A0,1 in an aluminum bar instrumented with eight piezoelectric transducers. The waveguide modal basis is calculated with the two-dimensional semi-analytical finite element method, and measurements are conducted using a three-dimensional laser-Doppler vibrometer. To illustrate the potential of the method for structural health monitoring purposes, the detection of a defect simulated by a pair of magnets placed at various positions over the bar width is demonstrated.

scholarly journals Tunability of the Nonlinear Interferometer Method for Anchoring Constructive Interference Patterns on the ITU-T Grid

2021 ◽  
Vol 11 (4) ◽  
pp. 1429
Author(s):  
Kyungdeuk Park ◽  
Dongjin Lee ◽  
Heedeuk Shin
Keyword(s):  
Collection Efficiency ◽  
Single Mode ◽  
Fine Tuning ◽  
Interference Method ◽  
Constructive Interference ◽  
Information Process ◽  
Pair Generation ◽  
Transmission Window ◽  
Nonlinear Interferometer ◽  
Photon States

Recently, a method of engineering the quantum states with a nonlinear interferometer was proposed to achieve precise state engineering for near-ideal single-mode operation and near-unity efficiency (L. Cui et al., Phys. Rev. A 102, 033718 (2020)), and the high-purity bi-photon states can be created without degrading brightness and collection efficiency. Here, we study the coarse or fine tunability of the nonlinear interference method to match constructive interference patterns into a transmission window of standard 100-GHz DWDM channels. The joint spectral intensity spectrum is measured for various conditions of the nonlinear interference effects. We show that the method has coarse- and fine-tuning ability while maintaining its high spectral purity. We expect that our results expand the usefulness of the nonlinear interference method. The photon-pair generation engineered via this method will be an excellent practical source of the quantum information process.

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