Acoustoelectric Methods for the Generation Manipulation and Detection of THz Radiation

用于产生操纵和检测太赫兹辐射的声电方法

• 批准号: EP/M016161/1
• 负责人: Anthony Kent
• 金额: $ 66.55万
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FM016161%2F1
• 关键词: Acoustoelectric; Methods; Generation; Manipulation; Detection

The conversion of acoustic signals (sound) to electrical signals, and vice-versa, is a technology that has found widespread practical applications. These include, for example: microphones and loudspeakers for sound recording and reproduction at audio frequencies (approx 20 Hz to 20 kHz); transducers for ultrasonic pulse-echo measurement and ultrasonic imaging systems (approx 20 KHz to 100s of MHz); and surface acoustic wave devices for signal processing in mobile communication devices (100s of MHz to a few GHz). The aim of this project is to develop a new technology for conversion between acoustic and electromagnetic (EM) signals, which works at much higher frequencies (10s of GHz to a few THz) and exploits acoustoelectric and piezojunction effects in semiconductor nanostructures and devices.Acoustoelectric effects in semiconductors are due to the electrons "riding" the acoustic wave as it travels through the crystal. The electrons are effectively dragged along by the sound wave from one electrical contact to the other, giving rise to an electrical current. We have recently obtained experimental evidence for acoustoelectric effect at acoustic wave frequencies up to 100s of GHz in semiconductor nanostructures which points to the feasibility of the proposed project to reach the THz range. The piezojunction effect is a related phenomenon, where the sound wave modulates the electrical conduction across an interface, or junction, between semiconductors such as found in, for example, diodes and transistors. Again, recent experimental evidence obtained by us shows that the piezojunction effect works to very high (THz) frequencies. In the project we will investigate a number of the most promising devices for acoustoelectric applications, and optimise their sensitivity and speed in response to the THz acoustic waves generated by ultrafast laser techniques or saser (sound laser).Potential applications, which we will explore in this project, include: new and improved methods of generation, manipulation and detection of THZ EM waves, e.g. heterodyne mixing of THz sound with THz EM waves, which have applications is scientific research, medical imaging and security screening; and the generation and detection of nanometre wavelength hypersound, which may be used to extend the established ultrasonics measurement and imaging techniques to the study of materials and structures at the nanoscale.

声信号（声音）到电信号的转换以及电信号到声信号的转换是一种已经得到广泛实际应用的技术。这些措施包括，例如：用于音频（约20 Hz至20 kHz）录音和再现的麦克风和扬声器;用于超声脉冲回波测量和超声成像系统的换能器（约20 KHz至100 MHz）;以及用于移动的通信设备中的信号处理的表面声波设备（100 MHz至几GHz）。该项目的目的是开发一种新的技术，用于在声波和电磁（EM）信号之间进行转换，该技术工作在更高的频率（10 GHz到几THz），并利用半导体纳米结构和器件中的声电和压电结效应。半导体中的声电效应是由于电子在声波穿过晶体时“骑着”声波。电子被声波有效地从一个电触点拖沿着到另一个，从而产生电流。我们最近获得的实验证据声电效应在声波频率高达100 GHz的半导体纳米结构，这表明拟议的项目，以达到太赫兹范围的可行性。压电结效应是一种相关的现象，其中声波调制半导体之间的界面或结的电导，例如在二极管和晶体管中发现的。再次，我们最近获得的实验证据表明，压电结效应的工作频率非常高（太赫兹）。在这个项目中，我们将研究一些最有前途的声电应用器件，并优化它们响应超快激光技术或saser产生的太赫兹声波的灵敏度和速度。（声激光）。我们将在本项目中探索的潜在应用包括：- 产生、操纵和检测THz EM波的新的和改进的方法，例如THz声音与THz EM波的外差混合，其应用于科学研究，医学成像和安全检查;以及纳米波长超声波的产生和检测，这可用于将现有的超声测量和成像技术扩展到纳米级材料和结构的研究。

项目成果

A high electron mobility phonotransistor

高电子迁移率声波晶体管

• DOI: 10.1038/s42005-018-0059-7
• 发表时间: 2018
• 期刊: Communications Physics
• 影响因子: 5.5
• 作者: Poyser C

Study of confined coherent acoustic phonon modes in a free-standing cubic GaN membrane by femtosecond spectroscopy

• DOI: 10.1063/1.4931495
• 发表时间: 2015-09
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Chuan He;M. Grossmann;D. Brick;M. Schubert;S. Novikov;C. T. Foxon;V. Gusev;A. Kent;T. Dekorsy

Phonon Spectroscopy with Chirped Shear and Compressive Acoustic Pulses.

• DOI: 10.1103/physrevlett.119.255502
• 发表时间: 2017-12
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: C. Poyser;W. York;D. Srikanthreddy;B. Glavin;T. Linnik;R. P. Campion-R. P.-Campion-2254186241;A. V. Akimov;A. J. Kent-A. J.-Kent-2253928911

A weakly coupled semiconductor superlattice as a harmonic hypersonic-electrical transducer

• DOI: 10.1088/1367-2630/17/8/083064
• 发表时间: 2015-09
• 期刊: New Journal of Physics
• 影响因子: 3.3
• 作者: C. Poyser;A. Akimov;A. Balanov;R. Campion;A. Kent

Coherent acoustic phonons in van der Waals nanolayers and heterostructures

• DOI: 10.1103/physrevb.98.075408
• 发表时间: 2018-08-09
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Greener, J. D. G.;Akimov, A., V;Patane, A.
• 通讯作者: Patane, A.