• Title/Summary/Keyword: Quantum physics

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Detection of the mechanical resonance of a micromechanical cantilever using dynamic flexural measurement technique and its mass sensing application

  • Kim, Hak-Seong;Yun, Ho-Yeol;Jeong, Un-Seok;Yu, Na-Ri;Park, Jeong-Ho;Lee, Sang-Uk
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.02a
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    • pp.447-447
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    • 2011

  • We studied to detect the mass variation using micro mechanical resonator. For measuring the resonance frequency of the micro mechanical system, optical method using laser interference is selected. A simple resonator is prepared by attaching an AFM cantilever on the piezo stack. The piezo stack makes a the cantilever vibrated with its resonance frequency. To change the mass of the resonator, gold was evaporated on the cantilever. We measured how much resonance frequency was changed according to the amount of gold attached on cantilever. This resonator is able to perform the role of a mass sensor and has a resolution of the order of micrograms. The fabrication of the resonator and measurement setup for detecting the mechanical resonance will be introduced in this presentation.

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Fabrication Tolerance of InGaAsP/InP-Air-Aperture Micropillar Cavities as 1.55-㎛ Quantum Dot Single-Photon Sources

  • Huang, Shuai;Xie, Xiumin;Xu, Qiang;Zhao, Xinhua;Deng, Guangwei;Zhou, Qiang;Wang, You;Song, Hai-Zhi
    • Current Optics and Photonics
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    • v.4 no.6
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    • pp.509-515
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    • 2020

  • A practical single photon source for fiber-based quantum information processing is still lacking. As a possible 1.55-㎛ quantum-dot single photon source, an InGaAsP/InP-air-aperture micropillar cavity is investigated in terms of fabrication tolerance. By properly modeling the processing uncertainty in layer thickness, layer diameter, surface roughness and the cavity shape distortion, the fabrication imperfection effects on the cavity quality are simulated using a finite-difference time-domain method. It turns out that, the cavity quality is not significantly changing with the processing precision, indicating the robustness against the imperfection of the fabrication processing. Under thickness error of ±2 nm, diameter uncertainty of ±2%, surface roughness of ±2.5 nm, and sidewall inclination of 0.5°, which are all readily available in current material and device fabrication techniques, the cavity quality remains good enough to form highly efficient and coherent 1.55-㎛ single photon sources. It is thus implied that a quantum dot contained InGaAsP/InP-air-aperture micropillar cavity is prospectively a practical candidate for single photon sources applied in a fiber-based quantum information network.

  • https://doi.org/10.3807/COPP.2020.4.6.509 인용 PDF KSCI