Article
Chemistry, Multidisciplinary
Petr A. Obraztsov, Vladislava V. Bulgakova, Pavel A. Chizhov, Alexander A. Ushakov, Dmitry S. Gets, Sergey Makarov, Vladimir V. Bukin
Summary: Hybrid organic-inorganic perovskites have shown potential in the development of scalable photoconductive terahertz emitters, with their optoelectronic properties chemically engineerable for desired applications. This study explores the characteristics of polycrystalline perovskite films for THz emission and provides insights into carrier lifetime and mobility using alternative noninvasive methods, showing their competitiveness with traditional semiconductors in THz emission.
Article
Optics
Ping-keng Lu, Mona Jarrahi
Summary: We present a telecommunication-compatible frequency-domain terahertz spectroscopy system realized by novel photoconductive antennas without using short-carrier-lifetime photoconductors. Built on a high-mobility InGaAs photoactive layer, these photoconductive antennas are designed with plasmonics-enhanced contact electrodes to achieve highly confined optical generation near the metal/semiconductor surface, which offers ultrafast photocarrier transport and efficient continuous-wave terahertz operation. Using two plasmonic photoconductive antennas as the source and detector, we demonstrate frequency-domain spectroscopy with a dynamic range more than 95 dB and an operation bandwidth of 2.5 THz. This novel approach to terahertz antenna design opens up possibilities for using different semiconductors and optical excitation wavelengths.
Article
Engineering, Electrical & Electronic
Gyejung Lee, Byungwoo Son, Do-Kyeong Ko, Sung-Min Hong, Sungbae Lee, Jae-Hyung Jang
Summary: A large aperture photoconductive antenna with a plasmonic grating structure can enhance the intensity of terahertz radiation. This enhancement is due to the plasmonic effect rather than the bias field effect. By improving the mechanism of optical absorption enhancement, the performance of terahertz radiation can be further enhanced.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Optics
David R. Bacon, Julien Madeo, Keshav M. Dani
Summary: Conceived over 30 years ago, photoconductive (PC) emitters have played a crucial role in the advancement and popularization of terahertz technology. They have been extensively utilized in various spectroscopy and imaging applications, and have undergone significant improvements in performance, making them suitable for broadband or non-linear spectroscopy applications. This review article provides an overview of the literature, highlighting key milestones in the development of PC emitters, as well as discussing the future prospects and existing challenges of PC technology.
Article
Chemistry, Multidisciplinary
Kirill A. Kuznetsov, Daniil A. Safronenkov, Petr Kuznetsov, Galiya Kh Kitaeva
Summary: This study experimentally demonstrated the efficient generation of terahertz radiation by a dipole photoconductive antenna based on a thin island film of a topological insulator, with comparable performance to a semiconductor photoconductive antenna of greater thickness. Current-voltage characteristics of Bi1.9Sb0.1Te2Se were studied, and possible mechanisms for generating terahertz waves were analyzed by comparing the characteristics of terahertz radiation from electrically biased and unbiased topological insulators.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
E. Nisha Flora Boby, Jitendra Prajapati, Vaisshale Rathinasamy, Shouvik Mukherjee, Shyamal Mondal
Summary: This article presents a detailed study on interdigitated photoconductive antenna (IPCA) structures for efficient terahertz (THz) generation and detection. By optimizing the structure of IPCA, it can overcome limitations of traditional antennas and achieve higher efficiency and power in THz signals.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Patrick Pertsch, Rene Kullock, Vinzenz Gabriel, Luka Zurak, Monika Emmerling, Bert Hecht
Summary: Visible and infrared photons can be detected with a broadband response by utilizing plasmonic nanostructures called nanoantennas. These nanoantennas introduce wavelength selectivity and additional functionalities, such as electronic responsivity switching and polarization detection. Previous devices required large arrays of nanostructures, but this study demonstrates the possibility of scaling down the concept to a single antenna, resulting in ultrasmall photodetectors with advanced functionality.
Article
Physics, Multidisciplinary
Yan Zhi-Jin, Shi Wei
Summary: In this study, a simulation calculation of the characteristics of a photoconductive antenna array radiating terahertz electromagnetic waves was conducted using CST Microwave Studio. The effects of pulsed photocurrents, antenna structure, and substrate material on the radiation of terahertz waves were analyzed, leading to the development of a 1 x 2 GaAs photoconductive antenna array with stronger directivity in radiating terahertz waves. The experimental results were consistent with the simulation conclusions, laying a theoretical and experimental basis for fabricating multielement terahertz photoconductive antenna arrays.
ACTA PHYSICA SINICA
(2021)
Article
Engineering, Electrical & Electronic
Saeid Gholami, Ali Bahari
Summary: By adding spiral lines to the electrodes of photoconductive dipole antennas, this paper increases the intensity and frequency peak of terahertz radiation. This change improves the effectiveness of the radiation output and is crucial for enhancing radiation efficiency.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Malte Welsch, Abhishek Singh, Stephan Winnerl, Alexej Pashkin, Ming Xu, Mengxia Li, Manfred Helm, Harald Schneider
Summary: Preventing device breakdown through series resistors can increase the optical-to-terahertz conversion efficiency for GaAs-based photoconductive terahertz emitters. Increasing the maximum bias field before device breakdown by a factor of 3 under illuminated conditions leads to a signal 3 times higher than the standard device.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2021)
Article
Optics
Jinhai Sun, He Cai, Mingde Li, Yun Xu, Guizhen Lu, Xutao Zhang, Yongqiang Liu
Summary: The laser electric field distribution, carrier distribution, and photoconductive current densities in the low temperature grown GaAs layer of a photoconductive antenna were simulated by the finite element method. The study also included designing and packaging a plasmon-induced terahertz PCA and evaluating the terahertz radiation properties of two kinds of PCAs using terahertz time-domain spectroscopy.
Article
Physics, Multidisciplinary
Wei Shi, Zhiquan Wang, Lei Hou, Haiqing Wang, Meilin Wu, Chaofan Li
Summary: The 2 x 2 terahertz photoconductive antenna (PCA) array detector in this study demonstrates high efficiency synthesis characteristics, leading to improved signal-to-noise ratio (SNR) of detected signals. Through a special micromachining process, current signal interference from adjacent antenna elements is eliminated, resulting in a 93.7% synthesis efficiency. The detector also exhibits low current noise and achieves a maximum SNR of 62 dB under different light energy excitation, depending on the number of antenna array elements.
FRONTIERS IN PHYSICS
(2021)
Article
Optics
Taras Viktorovich Kononenko, Kuralai Khamitzhanovna Ashikkalieva, Vitali Viktorovich Kononenko, Evgeny Viktorovich Zavedeev, Margarita Alexandrovna Dezhkina, Maxim Sergeevich Komlenok, Evgeny Evseevich Ashkinazi, Vladimir Valentinovich Bukin, Vitaly Ivanovich Konov
Summary: Recently, it was discovered that a nitrogen-doped diamond-based photoconductive antenna (PCA) can be effectively excited by the second harmonic of a Ti:sapphire laser. The THz emission performance of the PCA can be significantly improved by creating a stronger electric field between closely located electrodes. To achieve a uniform electric field, deep-buried graphite electrodes were fabricated inside the diamond crystal. Different PCAs with various electrode interspaces were tested and compared.
Article
Chemistry, Multidisciplinary
Fangjia Zhu, Maria Sanz-Paz, Antonio Fernandez-Dominguez, Mauricio Pilo-Pais, Guillermo P. Acuna
Summary: In this study, the performance of an ultracompact optical antenna based on gold nanorods was investigated through numerical simulations. The results showed that directional emission can be achieved by exciting the antiphase mode of the antenna, and the design is robust to structural variations.
Article
Engineering, Electrical & Electronic
E. Nisha Flora Boby, Sachin Kumar, Shyamal Mondal
Summary: This paper presents the design and development of a fractal photoconductive antenna for efficient terahertz generation and detection, improving the performance by leveraging fractal geometry. The parameters of the antenna are investigated, including carrier density, gap conductance, photocurrent, bandwidth, and conversion efficiency. The proposed fractal-shaped design achieves a significant increase in radiated power and bandwidth compared to conventional photoconductive antennas.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Multidisciplinary Sciences
Xing Lin, Yair Rivenson, Nezih T. Yardimei, Muhammed Veli, Yi Luo, Mona Jarrahi, Aydogan Ozcan
Article
Physics, Applied
N. T. Yardimci, D. Turan, S. Cakmakyapan, M. Jarrahi
APPLIED PHYSICS LETTERS
(2018)
Article
Physics, Applied
E. C. Snively, N. T. Yardimci, B. T. Jacobson, M. Jarrahi, P. Musumeci, A. Murokh
APPLIED PHYSICS LETTERS
(2018)
Article
Multidisciplinary Sciences
Muhammed Veli, Deniz Mengu, Nezih T. Yardimci, Yi Luo, Jingxi Li, Yair Rivenson, Mona Jarrahi, Aydogan Ozcan
Summary: Recent advances in deep learning have provided non-intuitive solutions to inverse problems in optics. Diffractive networks merge wave-optics with deep learning to design task-specific elements for all-optically performing tasks like object classification. The authors present a diffractive network used to shape broadband pulses into desired optical waveforms, demonstrating direct pulse shaping in the terahertz spectrum.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Jingxi Li, Deniz Mengu, Nezih T. Yardimci, Yi Luo, Xurong Li, Muhammed Veli, Yair Rivenson, Mona Jarrahi, Aydogan Ozcan
Summary: The research demonstrates optical networks using diffractive layers trained by deep learning to encode spatial information into the power spectrum of diffracted light, achieving optical classification of handwritten digits in the terahertz spectrum. The spectral encoding coupled with an electronic neural network enables task-specific image decompression.
Article
Multidisciplinary Sciences
Deniz Turan, Ping Keng Lu, Nezih T. Yardimci, Zhaoyu Liu, Liang Luo, Joong-Mok Park, Uttam Nandi, Jigang Wang, Sascha Preu, Mona Jarrahi
Summary: Semiconductor surface states typically hinder device performance, but in this case, the authors utilize them to enable wavelength conversion. They demonstrate a compact, passive conversion device using plasmon-coupled surface states, achieving efficient conversion of optical frequencies without relying on nonlinear phenomena.
NATURE COMMUNICATIONS
(2021)
Article
Optics
N. T. Yardimci, D. Turan, M. Jarrahi
Summary: The study introduces a photoconductive terahertz detector utilizing a plasmonic nanocavity, providing high sensitivity and broadband operation at very low optical pump power levels. This technology enables high-efficiency terahertz detection at extremely low optical power levels.
Correction
Multidisciplinary Sciences
Deniz Turan, Ping Keng Lu, Nezih T. Yardimci, Zhaoyu Liu, Liang Luo, Joong-Mok Park, Uttam Nandi, Jigang Wang, Sascha Preu, Mona Jarrahi
NATURE COMMUNICATIONS
(2021)
Article
Plant Sciences
Marvin Browne, Megan K. Bartlett, Christian Henry, Mona Jarrahi, Grace John, Christine Scoffoni, Nezih Tolga Yardimci, Lawren Sack
Summary: Intra-specific trait variation (ITV) is important in various processes, but it is rarely quantified for ecophysiological traits such as PV curve parameters. This study found low ITV for PV parameters compared to other morphological traits and strong intraspecific relationships among PV traits, using a conservative sampling design.
PHYSIOLOGIA PLANTARUM
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Nezih T. Yardimci, Semih Cakmakyapan, Soroosh Hemmati, Mona Jarrahi
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Nezih T. Yardimci, Mona Jarrahi
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Nezih Tolga Yardimci, Semih Cakmakyapan, Soroosh Hemmati, Mona Jarrahi
2017 75TH ANNUAL DEVICE RESEARCH CONFERENCE (DRC)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Nezih Tolga Yardimci, Semih Cakmakyapan, Soroosh Hemmati, Mona Jarrahi
2017 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Nezih Tolga Yardimci, Mona Jarrahi
2017 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM (IMS)
(2017)
