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  1. Article ; Online: Enhancement of spontaneous emission from CdSe/ZnS quantum dots through silicon nitride photonic crystal cavity based on miniaturized bound states in the continuum.

    Qiu, Guixin / Wei, Dunzhao / Liu, Zhuojun / Liu, Jin

    Nanoscale

    2023  Volume 15, Issue 8, Page(s) 3757–3763

    Abstract: Colloidal CdSe/ZnS quantum dots (QDs) exhibit excellent optical properties for wide potential applications in light-emitting diodes, solar concentrators, and single-photon sources. However, the ultra-thin films with low concentration of QDs still ... ...

    Abstract Colloidal CdSe/ZnS quantum dots (QDs) exhibit excellent optical properties for wide potential applications in light-emitting diodes, solar concentrators, and single-photon sources. However, the ultra-thin films with low concentration of QDs still encounter inefficient photoluminescence (PL) and poor directionality of radiation, which need to be enhanced using nanophotonics device designs. Here we design and experimentally demonstrate an on-substrate silicon nitride (SiN) photonic crystal (PhC) microcavity encapsulated by a layer of PMMA hosting CdSe/ZnS QDs. The miniaturized bound states in the continuum (BIC) supported by our structures, provide high-
    Language English
    Publishing date 2023-02-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d2nr05031e
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Conversion and selection of Laguerre-Gaussian modes via a variable aperture in a geometric-phase-plate-assisted optical resonator.

    Li, He / Li, Juntao / Wei, Dunzhao

    Optics letters

    2023  Volume 48, Issue 10, Page(s) 2672–2675

    Abstract: We numerically analyze the conversion and selection of intracavity modes in a two-mirror optical resonator, which is assisted by a geometric phase plate (GPP) and a circular aperture, along with its output performance of high-order Laguerre-Gaussian (LG) ...

    Abstract We numerically analyze the conversion and selection of intracavity modes in a two-mirror optical resonator, which is assisted by a geometric phase plate (GPP) and a circular aperture, along with its output performance of high-order Laguerre-Gaussian (LG) modes. Based on the iterative Fox-Li method and the analysis of modal decomposition, transmission losses, and spot sizes, we find that various self-consistent two-faced resonator modes could be formed by fixing the GPP but changing the size of aperture. Such a feature not only enriches transverse-mode structures inside the optical resonator, but also provides a flexible way to directly output high-purity LG modes for high-capacity optical communication, high-precision interferometers, high-dimensional quantum correlation, etc.
    Language English
    Publishing date 2023-05-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.487104
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Efficient second harmonic generation by harnessing bound states in the continuum in semi-nonlinear etchless lithium niobate waveguides.

    Li, Xueshi / Ma, Jiantao / Liu, Shunfa / Huang, Peinian / Chen, Bo / Wei, Dunzhao / Liu, Jin

    Light, science & applications

    2022  Volume 11, Issue 1, Page(s) 317

    Abstract: Integrated photonics provides unprecedented opportunities to pursue advanced nonlinear light sources with low-power consumptions and small footprints in a scalable manner, such as microcombs, chip-scale optical parametric oscillators and integrated ... ...

    Abstract Integrated photonics provides unprecedented opportunities to pursue advanced nonlinear light sources with low-power consumptions and small footprints in a scalable manner, such as microcombs, chip-scale optical parametric oscillators and integrated quantum light sources. Among a variety of nonlinear optical processes, high-efficiency second harmonic generation (SHG) on-chip is particularly appealing and yet challenging. In this work, we present efficient SHG in highly engineerable semi-nonlinear waveguides consisting of electron-beam resist waveguides and thin-film silicon nitride (SiN)/lithium niobate (LN). By carefully designing octave-separating bound states in the continuum (BICs) for the nonlinear interacting waves in such a hybrid structure, we have simultaneously optimized the losses for both fundamental frequency (FF) and second harmonic (SH) waves and achieved modal phasing matching and maximized the nonlinear modal overlap between the FF and SH waves, which results in an experimental conversion efficiency up to 4.05% W
    Language English
    Publishing date 2022-11-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 2662628-7
    ISSN 2047-7538 ; 2047-7538
    ISSN (online) 2047-7538
    ISSN 2047-7538
    DOI 10.1038/s41377-022-01017-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Integrated Reconfigurable Photon-Pair Source Based on High-Q Nonlinear Chalcogenide Glass Microring Resonators.

    Huang, Peinian / Chen, Bo / Xia, Di / Li, Zhixin / Zhang, Bin / Liu, Zhuojun / Wei, Dunzhao / Li, Zhaohui / Liu, Jin

    Nano letters

    2023  Volume 23, Issue 10, Page(s) 4487–4494

    Abstract: Chalcogenide glasses (ChGs) have recently emerged as enabling materials for building reconfigurable nanophotonic devices by employing their refractive index changes associated with photosensitive effects. In particular, the availability of low-loss thin- ... ...

    Abstract Chalcogenide glasses (ChGs) have recently emerged as enabling materials for building reconfigurable nanophotonic devices by employing their refractive index changes associated with photosensitive effects. In particular, the availability of low-loss thin-film ChGs and the realization of high-Q microresonators provide exciting opportunities for integrated photonics. So far, the ChG photonic devices are predominately operated in the classical optics regime. In this work, we present the realization on-chip bright photon-pair quantum light sources via spontaneous four-wave mixing in a high-Q microring resonator fabricated on the newly developed ChG Ge
    Language English
    Publishing date 2023-05-12
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.3c00858
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Manipulating the radial components of LG pump beam for ultrahigh-dimensional maximally entangled orbital angular momentum states.

    Xu, Chuan / Xiao, Lintao / He, Jianlang / Zhang, Han / Wei, Dunzhao / Hu, Xiaopeng / Xiao, Min / Zhang, Yong

    Optics express

    2022  Volume 30, Issue 7, Page(s) 11120–11129

    Abstract: High-dimensional maximally entangled orbital angular momentum (OAM) states are a promising resource for enhancing information capacity and robustness in quantum communication. However, it still lacks an effective method to increase the state ... ...

    Abstract High-dimensional maximally entangled orbital angular momentum (OAM) states are a promising resource for enhancing information capacity and robustness in quantum communication. However, it still lacks an effective method to increase the state dimensionality. Here, we theoretically propose an efficient scheme to generate maximally entangled OAM states of ultrahigh dimensionality by manipulating the radial components of a Laguerre-Gaussian (LG) pump beam. By optimizing the complex amplitudes of multiple radial modes of the LG pump light, one can feasibly achieve 101-dimensional OAM-based maximally entangled states. Our scheme has potential applications in high capacity quantum communication networks.
    Language English
    Publishing date 2022-04-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.452888
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Laser nanoprinting of 3D nonlinear holograms beyond 25000 pixels-per-inch for inter-wavelength-band information processing.

    Chen, Pengcheng / Xu, Xiaoyi / Wang, Tianxin / Zhou, Chao / Wei, Dunzhao / Ma, Jianan / Guo, Junjie / Cui, Xuejing / Cheng, Xiaoyan / Xie, Chenzhu / Zhang, Shuang / Zhu, Shining / Xiao, Min / Zhang, Yong

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 5523

    Abstract: Nonlinear optics provides a means to bridge between different electromagnetic frequencies, enabling communication between visible, infrared, and terahertz bands through ... ...

    Abstract Nonlinear optics provides a means to bridge between different electromagnetic frequencies, enabling communication between visible, infrared, and terahertz bands through χ
    Language English
    Publishing date 2023-09-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-41350-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Fabrication of 100-nm-period domain structure in lithium niobate on insulator.

    Ma, Jianan / Cheng, Xiaoyan / Zheng, Ningchong / Chen, Pengcheng / Xu, Xiaoyi / Wang, Tianxin / Wei, Dunzhao / Nie, Yuefeng / Zhu, Shining / Xiao, Min / Zhang, Yong

    Optics express

    2023  Volume 31, Issue 23, Page(s) 37464–37471

    Abstract: Lithium niobate on insulator (LNOI) is a powerful platform for integrated photonic circuits. Recently, advanced applications in nonlinear and quantum optics require to controllably fabricate nano-resolution domain structures in LNOI. Here, we report on ... ...

    Abstract Lithium niobate on insulator (LNOI) is a powerful platform for integrated photonic circuits. Recently, advanced applications in nonlinear and quantum optics require to controllably fabricate nano-resolution domain structures in LNOI. Here, we report on the fabrication of stable domain structures with sub-100 nm feature size through piezoelectric force microscopy (PFM) tip poling in a z-cut LNOI. In experiment, the domain dot with an initial diameter of 80 nm and the domain line with an initial width of 50 nm can survive after a storage of more than 3 months. Particularly, we demonstrate the successful fabrication of 1D stable domain array with a period down to 100 nm and a duty cycle of ∼50%. Our method paves the way to precisely manipulate frequency conversion and quantum entanglement on an LNOI chip.
    Language English
    Publishing date 2023-11-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.501804
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Femtosecond laser writing of lithium niobate ferroelectric nanodomains.

    Xu, Xiaoyi / Wang, Tianxin / Chen, Pengcheng / Zhou, Chao / Ma, Jianan / Wei, Dunzhao / Wang, Huijun / Niu, Ben / Fang, Xinyuan / Wu, Di / Zhu, Shining / Gu, Min / Xiao, Min / Zhang, Yong

    Nature

    2022  Volume 609, Issue 7927, Page(s) 496–501

    Abstract: Lithium niobate ( ... ...

    Abstract Lithium niobate (LiNbO
    Language English
    Publishing date 2022-09-14
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-022-05042-z
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 26: Show issues Location:
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  9. Article ; Online: Phase-Matching Controlled Orbital Angular Momentum Conversion in Periodically Poled Crystals.

    Chen, Yan / Ni, Rui / Wu, Yaodong / Du, Li / Hu, Xiaopeng / Wei, Dunzhao / Zhang, Yong / Zhu, Shining

    Physical review letters

    2020  Volume 125, Issue 14, Page(s) 143901

    Abstract: Nonlinear interactions between light waves can exchange energy, linear momentum, and angular momentum. The direction of energy flow between frequency components is usually determined by the conventional phase-matching condition related to the linear ... ...

    Abstract Nonlinear interactions between light waves can exchange energy, linear momentum, and angular momentum. The direction of energy flow between frequency components is usually determined by the conventional phase-matching condition related to the linear momentum. However, the transfer law of orbital angular momentum (OAM) during frequency conversion remains to be elucidated. Here, we demonstrate experimentally that OAM transfer depends strongly on the phase-matching condition defined by both linear and orbital angular momenta. Under different phase-matching configurations, the second-harmonic wave exhibits variable OAM spectral characteristics such as the presence of just a single value or of odd orders only. Our results pave the way toward unveiling the underlying mechanism of nonlinear conversion of OAM states.
    Language English
    Publishing date 2020-10-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.143901
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    In stock of ZB MED Bonn / Germany

    Z 4' 58/153: Show issues

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  10. Article ; Online: Evolution of the nonlinear Raman-Nath diffraction from near field to far field.

    Liu, Dongmei / Wei, Dunzhao / Gu, Min / Zhang, Yong / Hu, Xiaopeng / Xiao, Min / Han, Peng

    Optics letters

    2018  Volume 43, Issue 13, Page(s) 3168–3171

    Abstract: In this Letter, we studied the near-field effect of the nonlinear Raman-Nath diffraction experimentally in a 1D periodically poled ... ...

    Abstract In this Letter, we studied the near-field effect of the nonlinear Raman-Nath diffraction experimentally in a 1D periodically poled LiTaO
    Language English
    Publishing date 2018-07-01
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.43.003168
    Database MEDical Literature Analysis and Retrieval System OnLINE

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