Terahertz photonics

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The Role of the Organic Cation in Developing Efficient Green Perovskite LEDs Based on Quasi鈥2D Perovskite Heterostructures

Advanced Functional Materials Wiley 34:14 (2024)

Authors:

Alexandra J Ramadan, Woo Hyeon Jeong, Robert DJ Oliver, Junke Jiang, Akash Dasgupta, Zhongcheng Yuan, Joel Smith, Jae Eun Lee, Silvia G Motti, Olivia Gough, Zhenlong Li, Laura M Herz, Michael B Johnston, Hyosung Choi, Jacky Even, Claudine Katan, Bo Ram Lee, Henry J Snaith

Continuous wave terahertz detection using 1550聽nm pumped nonlinear photoconductive GaAs metasurfaces.

Optics express 32:6 (2024) 9809-9819

Authors:

James Seddon, Lucy Hale, Hyunseung Jung, Sarah Norman, Igal Brener, Alwyn Seeds, Cyril Renaud, Oleg Mitrofanov

Abstract:

Terahertz (THz) continuous wave (CW) spectroscopy systems can offer extremely high spectral resolution over the THz band by photo-mixing high-performance telecommunications-band (1530-1565 nm) lasers. However, typical THz CW detectors in these systems use narrow band-gap photoconductors, which require elaborate material growth and generate relatively large detector noise. Here we demonstrate that two-step photon absorption in a nano-structured low-temperature grown GaAs (LT-GaAs) metasurface which enables switching of photoconductivity within approximately one picosecond. We show that LT-GaAs can be used as an ultrafast photoconductor in CW THz detectors despite having a bandgap twice as large as the telecommunications laser photon energy. The metasurface design harnesses Mie modes in LT GaAs resonators, whereas metallic electrodes of THz detectors can be designed to 91探花 an additional photonic mode, which further increases photoconductivity at a desired wavelength.

Intermediate-Phase Engineering via Dimethylammonium Cation Additive for Stable Perovskite Solar Cells

Fundacio Scito (2024)

Authors:

Philippe Holzhey, Henry Snaith, Sebastian F眉rer, Steven Harvey, Laura Schelhas, James Ball, Suhas Mahesh, David McMeekin, Nicholas Hawkins, Jianfeng Lu, Michael Johnston, Joseph Berry, Udo Bach, Seongrok Seo

Engineering Terahertz Detector Arrays Based on InAs Nanowire Photoconductive Switches

Institute of Electrical and Electronics Engineers (IEEE) 00 (2024) 1-2

Authors:

Hannah J Joyce, Jack A Alexander-Webber, Greg Chu, Jamie D Lake, Thomas Albrow-Owen, Michael B Johnston, H Hoe Tan, C Jagadish

In-situ nanoscopy of carrier dynamics and nanomorphology in metal halide perovskites

Institute of Electrical and Electronics Engineers (IEEE) 00 (2024) 1-2

Authors:

M Zizlsperger, S Nerreter, Q Yuan, KB Lohmann, F Sandner, F Schiegl, C Meineke, Y Gerasimenko, LM Herz, T Siday, MA Huber, MB Johnston, R Huber