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Electro-Absorptive Quantum Dot Antenna Resolves Terahertz Lightwaves via Biased Stark Effect

Title data

Heindl, Moritz ; Zhu, Hua ; Bawendi, Moungi G. ; Herink, Georg:
Electro-Absorptive Quantum Dot Antenna Resolves Terahertz Lightwaves via Biased Stark Effect.
In: ACS Photonics. (13 December 2023) .
ISSN 2330-4022
DOI: https://doi.org/10.1021/acsphotonics.3c01464

Official URL: Volltext

Project information

Project financing: DFG, project 403711541
GRK 2818, project 464648186
H.Z. acknowledges support from the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering (Award No. DE-SC0021650)

Abstract in another language

Semiconductor quantum dots offer highly flexible optoelectronic properties, rendering them attractive for a growing number of applications, including single-photon emitters, fluorescence microscopy, and display technology. Here, we report the realization of an electro-absorptive terahertz (THz) antenna based on colloidal semiconductor nanocrystals for the phase-resolved detection of infrared lightwaves. Introducing AC-biasing to symmetric nanocrystals, we break the symmetric response of the quantum-confined Stark effect (QCSE) to the direction of the THz field and obtain a polarity-sensitive observable. In particular, we analyze the nonlinear scaling of the QCSE and demonstrate that differential detection via bias-modulation yields a signal that linearly depends on the THz field strength. This THz antenna employs solution-processed quantum dots and enables an all-optical readout via absorption or emission, offering highly flexible implementations of THz sensing in the time domain.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum dots; Terahertz sampling; time-domain spectroscopy; quantum-confined Stark effect; electro-absorption
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics VIII - Ultrafast Dynamics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Professor Experimental Physics VIII - Ultrafast Dynamics > Professor Experimental Physics VIII - Ultrafast Dynamics - Univ.-Prof. Dr. Georg Herink
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 18 Dec 2023 07:32
Last Modified: 18 Dec 2023 07:32
URI: https://eref.uni-bayreuth.de/id/eprint/88058