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628 results on '"Dong, Hongxing"'

61. Continuous-Wave Pumped Monolayer WS 2 Lasing for Photonic Barcoding.

Author

Cheng, Haodong, Qu, Junyu, Mao, Wangqi, Chen, Shula, and Dong, Hongxing

Subjects
MONOMOLECULAR films, ACTIVE medium, CONTINUOUS wave lasers, VAPOR-plating, PULSED lasers
Abstract

Micro/nano photonic barcoding has emerged as a promising technology for information security and anti-counterfeiting applications owing to its high security and robust tamper resistance. However, the practical application of conventional micro/nano photonic barcodes is constrained by limitations in encoding capacity and identification verification (e.g., broad emission bandwidth and the expense of pulsed lasers). Herein, we propose high-capacity photonic barcode labels by leveraging continuous-wave (CW) pumped monolayer tungsten disulfide (WS2) lasing. Large-area, high-quality monolayer WS2 films were grown via a vapor deposition method and coupled with external cavities to construct optically pumped microlasers, thus achieving an excellent CW-pumped lasing with a narrow linewidth (~0.39 nm) and a low threshold (~400 W cm−2) at room temperature. Each pixel within the photonic barcode labels consists of closely packed WS2 microlasers of varying sizes, demonstrating high-density and nonuniform multiple-mode lasing signals that facilitate barcode encoding. Notably, CW operation and narrow-linewidth lasing emission could significantly simplify detection. As proof of concept, a 20-pixel label exhibits a high encoding capacity (2.35 × 10108). This work may promote the advancement of two-dimensional materials micro/nanolasers and offer a promising platform for information encoding and security applications. [ABSTRACT FROM AUTHOR]

Published
2024
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62. Vertically Aligned Perovskite Laser Arrays for High‐Capacity Anticounterfeiting Labels.

Author

Liu, Liang, Mao, Wangqi, Gao, Xinyu, He, Chenglin, Tang, Zilan, Chang, Hao, Zhang, Long, Wang, Xiaoxia, Dong, Hongxing, and Pan, Anlian

Subjects
ALUMINUM oxide, PEROVSKITE, LASERS, DATA replication, PIXELS, MAGNETIC recorders & recording
Abstract

Physically unclonable functions (PUFs) have emerged as the most effective method against counterfeiting, leveraging the intrinsic randomness of objects to avoid data replication. However, despite their efficacy, the complexity and high cost of most PUF‐based counterfeiting labels hinder their practical application. Here, a high‐capacity PUF label based on vertically aligned perovskite nanowire (NW) arrays is demonstrated. The NW arrays are conveniently constructed using a low‐cost solution process using an anodized aluminum oxide template. Each pixel within the label is composed of closely packed CsPbBr3 NW arrays of different lengths, resulting in varied lasing signals. The collected signal of each pixel emerged from the lasing output of the NW arrays, generating high‐density and nonuniform multiple‐mode lasing to facilitate information encoding. A quaternary encoding mechanism is used to encode the number of laser modes per pixel. Impressively, it exhibits a mapping resolution of 1600 pixels within 400 µm2, achieving an impressive encoding capacity (1.97 × 10963) and a pixel density (4 bits µm−2) in this compact area. This work shows a promising approach for anticounterfeiting applications because of its simplicity, low cost, and high encoding capacity. [ABSTRACT FROM AUTHOR]

Published
2024
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73. Room temperature one-dimensional polariton condensate in a ZnO microwire

Author

Sun, Liaoxin, Sun, Shulin, Dong, Hongxing, Xie, Wei, Richard, M., Zhou, Lei, Dang, L. S., Shen, Xuechu, and Chen, Zhanghai

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

A cavity-polariton, formed due to the strong coupling between exciton and cavity mode, is one of the most promising composite bosons for realizing macroscopic spontaneous coherence at high temperature. Up to date, most of polariton quantum degeneracy experiments were conducted in the complicated two-dimensional (2D) planar microcavities. The role of dimensionality in coherent quantum degeneracy of a composite bosonic system of exciton polaritons remains mysterious. Here we report the first experimental observation of a one-dimensional (1D) polariton condensate in a ZnO microwire at room temperature. The massive occupation of the polariton ground state above a distinct pump power threshold is clearly demonstrated by using the angular resolved spectroscopy under non-resonant excitation. The power threshold is one order of magnitude lower than that of Mott transition. Furthermore, a well-defined far field emission pattern from the polariton condensate mode is observed, manifesting the coherence build-up in the condensed polariton system., Comment: 18 pages, 4 figures

Published
2010

93. An Iris Recognition Method Based on Annule-energy Feature

Author

Huo, Guang, Liu, Yuanning, Zhu, Xiaodong, Huang, Chun, He, Fei, Gao, Si, Dong, Hongxing, Yu, Lijiao, Yang, Xia, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Yang, Jinfeng, editor, Yang, Jucheng, editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Zheng, Weishi, editor, and Feng, Jianjiang, editor

Published
2015
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95. Energy-saving High-bandwidth Perovskite Nano-encoder

Author

Xie, Wei, primary, Liang, Shuang, additional, Zhong, Yichi, additional, Tang, Bing, additional, Wang, Qiangqiang, additional, Hu, Yongsheng, additional, Wang, Zhenyu, additional, Zhang, Long, additional, Dong, Hongxing, additional, and Xu, Hongxing, additional

Published
2023
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99. An Effective Iris Recognition Method Based on Scale Invariant Feature Transformation

Author

Huo, Guang, Liu, Yuanning, Zhu, Xiaodong, Wang, Hongye, Yu, Lijiao, He, Fei, Gao, Si, Dong, Hongxing, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Sang, Haifeng, editor, Zhou, Jie, editor, Wang, Yunhong, editor, and Yuan, Weiqi, editor

Published
2014
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