npj Nanophotonics最新文献_第6页

Celebrating one year of npj Nanophotonics—reflecting on achievements and looking forward 庆祝 npj 纳米光子技术公司成立一周年--回顾成就，展望未来

npj Nanophotonics Pub Date : 2024-05-27 DOI: 10.1038/s44310-024-00020-x

Baohua Jia

引用次数: 0

Brillouin light storage for 100 pulse widths 可存储 100 个脉冲宽度的布里渊光

npj Nanophotonics Pub Date : 2024-05-02 DOI: 10.1038/s44310-024-00004-x

Birgit Stiller, Kevin Jaksch, Johannes Piotrowski, Moritz Merklein, Mikołaj K. Schmidt, Khu Vu, Pan Ma, Stephen Madden, Michael J. Steel, Christopher G. Poulton, Benjamin J. Eggleton

{"title":"Brillouin light storage for 100 pulse widths","authors":"Birgit Stiller, Kevin Jaksch, Johannes Piotrowski, Moritz Merklein, Mikołaj K. Schmidt, Khu Vu, Pan Ma, Stephen Madden, Michael J. Steel, Christopher G. Poulton, Benjamin J. Eggleton","doi":"10.1038/s44310-024-00004-x","DOIUrl":"10.1038/s44310-024-00004-x","url":null,"abstract":"Signal processing based on stimulated Brillouin scattering (SBS) is limited by the narrow linewidth of the optoacoustic response, which confines many Brillouin applications to continuous wave signals or optical pulses longer than several nanoseconds. In this work, we experimentally demonstrate Brillouin interactions at the 150 ps time scale and a delay for a record 15 ns which corresponds to a delay of 100 pulse widths. This breakthrough experimental result was enabled by the high local gain of the chalcogenide waveguides as the optoacoustic interaction length reduces with pulse width. We successfully transfer 150 ps-long pulses to traveling acoustic waves within a Brillouin-based memory setup. The information encoded in the optical pulses is stored for 15 ns in the acoustic field. We show the retrieval of eight amplitude levels, multiple consecutive pulses, and low distortion in pulse shape. The extension of Brillouin-based storage to the ultra-short pulse regime is an important step for the realization of practical Brillouin-based delay lines and other optical processing applications.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00004-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140819069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Controlling lasing around exceptional points in coupled nanolasers 控制耦合纳米激光器中特殊点附近的激光

npj Nanophotonics Pub Date : 2024-05-02 DOI: 10.1038/s44310-024-00006-9

Anna Fischer, T. V. Raziman, Wai Kit Ng, Jente Clarysse, Dhruv Saxena, Jakub Dranczewski, Stefano Vezzoli, Heinz Schmid, Kirsten Moselund, Riccardo Sapienza

{"title":"Controlling lasing around exceptional points in coupled nanolasers","authors":"Anna Fischer, T. V. Raziman, Wai Kit Ng, Jente Clarysse, Dhruv Saxena, Jakub Dranczewski, Stefano Vezzoli, Heinz Schmid, Kirsten Moselund, Riccardo Sapienza","doi":"10.1038/s44310-024-00006-9","DOIUrl":"10.1038/s44310-024-00006-9","url":null,"abstract":"Coupled nanolasers are of growing interest for on-chip optical computation and data transmission, which requires an understanding of how lasers interact to form complex systems. The non-Hermitian interaction between two coupled resonators, when excited selectively, can lead to parity-time symmetry, the formation of exceptional points, and subsequently spectral control and increased sensitivity. These investigations have been limited to pump energies close to the lasing threshold, and large or narrow-line lasers. Here, by programmable optical excitation we study two coupled nanolasers significantly above threshold, where mode instability plays an important role. We map the mode evolution around two exceptional points, and observe lasing gaps due to reversed pump dependence which compare well with non-linear theory. Finally, the coupling can be exploited to control the lasing threshold and wavelength, and for frequency switching around the lasing gap. Controlled and integrated nanolasers constitutes a promising platform for future highly sensitive and programmable on-chip laser sources.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00006-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140819053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantitative phase imaging with a compact meta-microscope 利用紧凑型元显微镜进行定量相位成像

npj Nanophotonics Pub Date : 2024-04-08 DOI: 10.1038/s44310-024-00007-8

Junyi Wang, Rongtao Yu, Xin Ye, Jiacheng Sun, Jian Li, Chunyu Huang, Xingjian Xiao, Jitao Ji, Wenjing Shen, Zuoxiu Tie, Chen Chen, Shining Zhu, Tao Li

{"title":"Quantitative phase imaging with a compact meta-microscope","authors":"Junyi Wang, Rongtao Yu, Xin Ye, Jiacheng Sun, Jian Li, Chunyu Huang, Xingjian Xiao, Jitao Ji, Wenjing Shen, Zuoxiu Tie, Chen Chen, Shining Zhu, Tao Li","doi":"10.1038/s44310-024-00007-8","DOIUrl":"10.1038/s44310-024-00007-8","url":null,"abstract":"Quantitative phase imaging (QPI) based on the transport-of-intensity equation (TIE) is a powerful technique in label-free microscopy. The image stack required for a successful TIE-QPI is traditionally obtained by translating the object or image plane, and the optical elements used in the conventional TIE-QPI systems are usually bulky and cumbersome. Stable and compact TIE-QPI methods capable of non-motion optical zooming can significantly facilitate applications that demand portability. Here, we propose a non-motion TIE-QPI method based on a dispersive metalens. The dispersive nature of the metalens is utilized to provide a spectral focal tuning. With fixed object and image planes, seven through-focus intensity images are captured by changing the illumination wavelength. The QPI performance is validated by retrieving the surface phase profiles of a microlens array and a phase resolution target, showing a high phase detection accuracy (deviation less than 0.03 wavelength). Subsequently, we established a compact meta-microscope by integrating the metalens with a commercially available CMOS image sensor, which shows good performance in microscopic imaging of unstained bio-samples. Our approach, based on the large-dispersive metalens, facilitates a compact and robust QPI system for optical metrology and label-free microscopy.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00007-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140538036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Entanglement in Resonance Fluorescence 共振荧光中的纠缠

npj Nanophotonics Pub Date : 2024-04-01 DOI: 10.1038/s44310-023-00001-6

Juan Camilo López Carreño, Santiago Bermúdez Feijoo, Magdalena Stobińska

引用次数: 0

Room-temperature waveguide-coupled silicon single-photon avalanche diodes 室温波导耦合硅单光子雪崩二极管

npj Nanophotonics Pub Date : 2024-03-06 DOI: 10.1038/s44310-024-00003-y

Alperen Govdeli, John N. Straguzzi, Zheng Yong, Yiding Lin, Xianshu Luo, Hongyao Chua, Guo-Qiang Lo, Wesley D. Sacher, Joyce K. S. Poon

{"title":"Room-temperature waveguide-coupled silicon single-photon avalanche diodes","authors":"Alperen Govdeli, John N. Straguzzi, Zheng Yong, Yiding Lin, Xianshu Luo, Hongyao Chua, Guo-Qiang Lo, Wesley D. Sacher, Joyce K. S. Poon","doi":"10.1038/s44310-024-00003-y","DOIUrl":"10.1038/s44310-024-00003-y","url":null,"abstract":"Single photon detection is important for a wide range of low-light applications, including quantum information processing, spectroscopy, and light detection and ranging (LiDAR). A key challenge in these applications has been to integrate single-photon detection capability into photonic circuits for the realization of complex photonic microsystems. Short-wavelength (λ < 1.1 μm) integrated photonics platforms that use silicon (Si) as photodetectors offer the opportunity to achieve single-photon avalanche diodes (SPADs) that operate at or near room temperature. Here, we report the first waveguide-coupled Si SPAD. The device is monolithically integrated in a Si photonic platform and operates in the visible spectrum. The device exhibited a single photon detection efficiency of >6% for wavelengths of 488 and 532 nm with an excess voltage of <20% of the breakdown voltage. The dark count rate was below 100 kHz at room temperature, with the possibility of improving by approximately 35% by reducing the temperature to −5 °C.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00003-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140043203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coincidence imaging for Jones matrix with a deep-learning approach 采用深度学习方法对琼斯矩阵进行重合成像

npj Nanophotonics Pub Date : 2024-03-06 DOI: 10.1038/s44310-024-00002-z

Jiawei Xi, Tsz Kit Yung, Hong Liang, Tan Li, Wing Yim Tam, Jensen Li

{"title":"Coincidence imaging for Jones matrix with a deep-learning approach","authors":"Jiawei Xi, Tsz Kit Yung, Hong Liang, Tan Li, Wing Yim Tam, Jensen Li","doi":"10.1038/s44310-024-00002-z","DOIUrl":"10.1038/s44310-024-00002-z","url":null,"abstract":"Coincidence measurement has become an emerging technique for optical imaging. Based on measuring the second-order coherence g2, sample features such as reflection/transmission amplitude and phase delay can be extracted with developed algorithms pixel-by-pixel. However, an accurate measurement of g2 requires a substantial number of collected photons which becomes difficult under low-light conditions. Here, we propose a deep-learning approach for Jones matrix imaging using photon arrival data directly. A variational autoencoder (β-VAE) is trained using numerical data in an unsupervised manner to obtain a minimal data representation, which can be transformed into an image with little effort. We demonstrate as few as 88 photons collected per pixel on average to extract a Jones matrix image, with accuracy surpassing previous semi-analytic algorithms derived from g2. Our approach not only automates formulating imaging algorithms but can also assess the sufficiency of information from a designed experimental procedure, which can be useful in equipment or algorithm designs for a wide range of imaging applications.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00002-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140043214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0