Meineke, Christian and Prager, Michael and Hayes, Johannes and Wen, Qiannan and Kastner, Lukas Zheyi and Schuh, Dieter and Fritsch, Kilian and Pronin, Oleg and Stein, Markus and Schafer, Felix and Chatterjee, Sangam and Kira, Mackillo and Huber, Rupert and Bougeard, Dominique (2022) Scalable high-repetition-rate sub-half-cycle terahertz pulses from spatially indirect interband transitions. LIGHT-SCIENCE & APPLICATIONS, 11 (1): 151. ISSN 2047-7538
Full text not available from this repository. (Request a copy)Abstract
Intense phase-locked terahertz (THz) pulses are the bedrock of THz lightwave electronics, where the carrier field creates a transient bias to control electrons on sub-cycle time scales. Key applications such as THz scanning tunnelling microscopy or electronic devices operating at optical clock rates call for ultimately short, almost unipolar waveforms, at megahertz (MHz) repetition rates. Here, we present a flexible and scalable scheme for the generation of strong phase-locked THz pulses based on shift currents in type-II-aligned epitaxial semiconductor heterostructures. The measured THz waveforms exhibit only 0.45 optical cycles at their centre frequency within the full width at half maximum of the intensity envelope, peak fields above 1.1 kV cm(-1) and spectral components up to the mid-infrared, at a repetition rate of 4 MHz. The only positive half-cycle of this waveform exceeds all negative half-cycles by almost four times, which is unexpected from shift currents alone. Our detailed analysis reveals that local charging dynamics induces the pronounced positive THz-emission peak as electrons and holes approach charge neutrality after separation by the optical pump pulse, also enabling ultrabroadband operation. Our unipolar emitters mark a milestone for flexibly scalable, next-generation high-repetition-rate sources of intense and strongly asymmetric electric field transients.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SINGLE-MOLECULE; EMITTERS; LIGHT; FIELD |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Dominique Bougeard |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Feb 2024 06:37 |
| Last Modified: | 15 Feb 2024 06:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57547 |
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