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arXiv 2023年

作者： Morris, Ian M. Klink, Kai Singh, Jaideep T. Mendoza-Cortes, Jose L. Nicley, Shannon S. Becker, Jones N. Department of Physics and Astronomy Michigan State University United States Department of Chemical Engineering & Materials Science Michigan State University United States Department of Electrical and Computer Engineering Michigan State University Department of Chemical Engineering & Materials Science Michigan State University United States Fraunhofer USA Inc United States Fraunhofer USA Inc. United States Department of Electrical and Computer Engineering Michigan State University United States

Detecting a non-zero electric dipole moment (EDM) in a particle would unambiguously signify physics beyond the Standard Model. A potential pathway towards this is the detection of a nuclear Schiff moment, the magnitude of which is enhanced by the presence of nuclear octupole deformation. However, due to the low production rate of isotopes featuring such"pear-shaped" nuclei, capturing, detecting, and manipulating them efficiently is a crucial prerequisite. Incorporating them into synthetic diamond optical crystals can produce defects with defined, molecule-like structures and isolated electronic states within the diamond band gap, increasing capture efficiency, enabling repeated probing of even a single atom, and producing narrow optical linewidths. In this study, we used density functional theory (DFT) to investigate the formation, structure, and electronic properties of crystal defects in diamond containing 229Pa, a rare isotope that is predicted to have an exceptionally strong nuclear octupole deformation. In addition, we identified and studied stable lanthanide-containing defects with similar electronic structures as non-radioactive proxies to aid in experimental methods. Our findings hold promise for the existence of such defects and can contribute to the development of a quantum information processing-inspired toolbox of techniques for studying rare isotopes. © 2023, CC BY.

关键词： Electronic properties

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Enhancing Quantum Emission from Spin Defects in Hexagonal Boron Nitride with a Plasmonic Nanocavity

Enhancing Quantum Emission from Spin Defects in Hexagonal Bo...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Xu, Xiaohui Solanki, Abhishek B. Sychev, Demid Gao, Xingyu Peana, Samuel Baburin, Alexander S. Pagadala, Karthik Martin, Zachariah O. Chowdhury, Sarah N. Chen, Yong P. Taniguchi, Takashi Watanabe, Kenji Rodionov, Ilya A. Kildishev, Alexander Li, Tongcang Upadhyaya, Pramey Boltasseva, Alexandra Shalaev, Vladimir M. School of Materials Engineering Purdue University West LafayetteIN47907 United States School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States Department of Physics and Astronomy Purdue University West LafayetteIN47907 United States FMN Laboratory BaumanMoscow State Technical University Moscow105005 Russia National Institute for Materials Science Namiki Tsukuba305-0044 Japan Moscow127055 Russia

We report a 250-fold photoluminescence enhancement of VB- spin-defects in hBN by coupling them to nanopatch antennas (NPA). Considering the relative size of the NPAs and laser-spot, an actual enhancement of 1695 times... 详细信息

ISBN: (纸本)9781957171258

关键词： Defects

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Optimizing the Ferroelectric Properties of Hf1-xZrxO2 Films via Crystal Orientation

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ACS Applied Electronic materials 2023年第2期5卷 1114-1122页

作者： Teng, Chih-Yu Cheng, Chia-Chieh Li, Kai-Shin Hu, Chenming Lin, Jhih-Min Lin, Bi-Hsuan Tang, Mau-Tsu Tseng, Yuan-Chieh Department of Materials Science & Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Taiwan Semiconductor Research Institute Hsinchu30010 Taiwan Intelligent Semiconductor Nano-system Technology Research Center National Yang Ming Chiao Tung University 1001 Ta Hsueh Road Hsinchu30010 Taiwan Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States National Synchrotron Radiation Research Center Hsinchu30076 Taiwan

This study exploits the coupling of crystallographic and ferroelectric (FE) properties in an effort to enhance the FE performance of Hf1-xZrxO2 (HZO). The proposed scheme involved optimizing the orientation of orthorhombic (O)-phase crystals along the preferred polarization axis by applying an electric pulse during annealing. The proposed electric pulse annealing (EPA) process reduced the need for wake-up treatment;however, it imposed limited changes on the amount of the O-phase and leakage performance, compared with rapid thermal annealing (RTA). Excessively high EPA doses induced an O → M (monoclinic) phase transformation, which sacrificed FE polarization but preserved the wake-up-free-like properties. Our results demonstrate that optimizing the orientation of polycrystalline O-phase may be as important as maximizing the quantity of O-phase for HZO applications. © 2023 American Chemical Society.

关键词： Ferroelectricity

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Soliton Vortex Comb Generation in an AlGaAs Microresonator for Self-Torque Pulse Synthesis

Soliton Vortex Comb Generation in an AlGaAs Microresonator f...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Liu, Y. Chen, B. Zhou, Y. Ye, C. Cao, Q. Huang, P. Kim, C. Zheng, Y. Oxenløwe, L.K. Yvind, K. Li, J. Li, J. Zhang, Y. Dong, C. Fu, S. Zhan, Q. Wang, X. Liu, J. Pu, M. DTU Electro Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark State Key Laboratory of Optoelectronic Materials and Technologies School of Physics School of Electronics and Information Technology Sun Yat-sen University Guangzhou China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai China Zhangjiang Laboratory Shanghai China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei China Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen China

We demonstrate bright soliton generation at room temperature within a grating-dressed AlGaAs-on-insulator microresonator and the simultaneous emission of phase-locked vortices, enabling the synthesis of self-torque pu... 详细信息

关键词： Microresonators

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Soliton Vortex Comb Generation in an AlGaAs Microresonator for Self-Torque Pulse Synthesis

Soliton Vortex Comb Generation in an AlGaAs Microresonator f...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Microcavities

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Tunable Threshold in VO2-based Photonic Devices Enabled by Defect engineering

Tunable Threshold in VO2-based Photonic Devices Enabled by D...

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CLEO: QELS_Fundamental science, QELS 2022

作者： Wan, Chenghao Hafermann, Martin Park, Tae Joon Zhang, Zhen Xiao, Yuzhe Mei, Hongyan Ramanathan, Shriram Ronning, Carsten Kats, Mikhail A. Department of Electrical and Computer Engineering University of Wisconsin-Madison MadisonWI53706 United States Department of Materials Science and Engineering University of Wisconsin-Madison MadisonWI53706 United States Institute of Solid State Physics Friedrich-Schiller-Universität Jena Thuringia Jena07743 Germany School of Materials Engineering Purdue University West LafayetteIN47907 United States

Using ion implantation, we engineered tunable thresholds of optical switches that incorporated frequency-selective surfaces (FSSs) with thin-film VO2. We also used a focused ion beam to selectively control any passban... 详细信息

ISBN: (纸本)9781557528209

关键词： Vanadium dioxide

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CHARACTERIZATION OF APTAMER FUNCTIONALIZED GOLD ELECTRODES FOR HISTONE DETECTION

CHARACTERIZATION OF APTAMER FUNCTIONALIZED GOLD ELECTRODES F...

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2022 Solid-State Sensors, Actuators and Microsystems Workshop, Hilton Head 2022

作者： Richardson, Hayley Barahona, Jeffrey Carter, Gavin Miller, Francis J. Lobaton, Edgar Pavlidis, Spyridon Department of Materials & Science Engineering NC State University United States Department of Electrical & Computer Engineering NC State University United States Department of Medicine Duke University United States School of Medicine Wake Forest University United States Salisbury Veterans Affairs Medical Center United States

ISBN: (纸本)9781940470047

This paper presents findings on the development of an electrochemical histone sensor using gold electrodes functionalized with a histone-specific RNA aptamer sequence. This has applications for early detection of circulating histones which are associated with increased mortality of critically ill patients. Surface plasmon resonance was used to characterize the electrode functionalization process and examine the specific responses to calf thymus and human histones. Through SPR, we show statistically significant differentiation of the responses between different functionalization processes with p © 2022 TRF.

关键词： Surface plasmon resonance

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electrically Tuning Quasi-Bound States in the Continuum with Hybrid Graphene-Silicon Metasurfaces

arXiv

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arXiv 2024年

作者： Cai, Ziqiang Zhang, Xianzhe Karnik, Tushar Sanjay Xu, Yihao Kim, Tae Yoon Hu, Juejun Liu, Yongmin Department of Electrical and Computer Engineering Northeastern University BostonMA02115 United States Department of Materials Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Department of Mechanical and Industrial Engineering Northeastern University BostonMA02115 United States

Metasurfaces have become one of the most prominent research topics in the field of optics owing to their unprecedented properties and novel applications on an ultrathin platform. By combining graphene with metasurfaces, electrical tunable functions can be achieved with fast tuning speed, large modulation depth and broad tuning range. However, the tuning efficiency of hybrid graphene metasurfaces within the short-wavelength infrared (SWIR) spectrum is typically low because of the small resonance wavelength shift in this wavelength range. In this work, through the integration of graphene and silicon metasurfaces that support quasi-bound states in the continuum (quasi-BIC), we experimentally demonstrate significant transmittance tuning even with less than 30 nm resonance wavelength shift thanks to the high quality-factor of quasi-BIC metasurfaces. The tunable transmittance spectrum was measured using Fourier Transform Infrared Spectroscopy (FTIR) with a modified reflective lens to improve the accuracy, and the electrical tuning was realized utilizing the "cut-and-stick" method of ion gel. At the wavelength of 3.0 µm, the measured change of transmittance ΔT = Tmax − Tmin and modulation depth ΔT/Tmax can reach 22.2% and 28.9%, respectively, under a small bias voltage ranging from -2 V to +2 V. To the best of our knowledge, this work is the first experimental demonstration of tunable graphene/quasi-BIC metasurfaces, which have potential applications in optical modulation, reconfigurable photonic devices, and optical communications. Copyright © 2024, The Authors. All rights reserved.

关键词： Graphene

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The Effect of Major Depressive Disorder on Producing Intelligible Speech

SSRN

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SSRN 2024年

作者： Seneviratne, Nadee Li, Leslie Espy-Wilson, Carol Department of Electrical and Computer Engineering University of Maryland College ParkMD20740 United States Program in Neuroscience and Cognitive Science Department of Linguistics University of Maryland College ParkMD20740 United States

Understanding the characteristics of depressed speech can provide insights on aspects to consider when developing biomarkers for automatic depression detection systems. We present the results of a speech intelligibility study that was conducted to assess the intelligibility of the speech of a female and a male subject when they were severely depressed and when they were in remission. Our analysis shows that, in general, the depressed speech is at least as intelligible as in-remission speech. This is further supported by the underlying "simpler" articulatory coordination of depressed speech as derived from the Articulatory Coordination Features. Acoustically, the simpler articulatory coordination means that there is less variability due to coarticulation in the speech signal. © 2024, The Authors. All rights reserved.

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Short Wave Infrared Upconversion Imager with Electron Blocking Layer to Screen Electron Injection into Photosensitive Layer

Short Wave Infrared Upconversion Imager with Electron Blocki...

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IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)

作者： Chanho Shin Ning Li Tse Nga Ng Material Science and Engineering Program University of California San Diego La Jolla USA Department of Electrical and Computer Engineering University of California San Diego La Jolla USA

In this work, we demonstrated upconversion imagers integrated with shortwave infrared photodetectors paired with an electron blocking layer. The use of electron blocking layer screened charge injection to prevent recombination in photosensitive layer. The characteristics of each electron blocking layer were analyzed in aspects of noise and detectivity. For the optimized device, the parasitic luminance in the dark was efficiently suppressed, and the photon-to-photon efficiency was increased. The electron blocking layer used in this work is generally applicable for upconversion imagers using different absorption and emitting materials.

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