Lianhe Li
University of Leeds
568 Papers
2.5K Citations
Lianhe Li is an academic researcher from University of Leeds. The author has contributed to research in topics: Terahertz radiation & Laser. The author has an hindex of 45, co-authored 532 publications. Previous affiliations of Lianhe Li include Centre national de la recherche scientifique & Lanzhou University.
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Papers
Mid-infrared detection in p-GaAs/AlGaAs heterostructures with a current blocking barrier
Dilip Chauhan,A. G. Unil Perera,Lianhe Li,Li Chen,Edmund H. Linfield +4 more
- 03 Feb 2017
Abstract: For the infrared detection in the 3-5 μm range, p-GaAs/AlxGa1-xAs heterojunction is an attractive material system due to light hole/heavy hole and spin-orbit split-off intra-valance band transitions in this wavelength range. Varying the Al mole fraction (x) provides the tuning for the wavelength threshold, while graded AlxGa1-xAs potential barriers create an asymmetry to allow a photovoltaic operation. The photovoltaic mode of operation offers the advantage of thermal noise limited performance. In our preliminary work, a 2 – 6 μm photovoltaic detector was studied. Implementation of an additional current blocking barrier improved the specific detectivity (D*) by two orders of magnitude, to 1.9×1011 Jones at 2.7 μm, at 77K. At zero bias, the resistance-area product (R0A) had a value of ~ 7.2×108 Ω cm2, which is five orders higher in magnitude (with a corresponding reduction of the responsivity by only a factor of ~ 1.5), compared to the R0A value without the blocking barrier. A photoresponse was observed up to 130K.
Auto-Calibrated Charge-Sensitive Infrared Phototransistor at 9.3 µm
Djamal Gacemi,Angela Vasanelli,Lianhe Li,Alexander Giles Davies,Edmund H. Linfield,Carlo Sirtori,Yanko Todorov +6 more
TL;DR: In this article , a charge-sensitive infrared photo-transistors (CSIP) was designed to work for a 9.3 µm wavelength where the Al composition was kept constant and the triangular barrier was replaced by tunnel-coupled quantum wells.
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Aperiodic photonic architectures for high-power distributed feedback THz quantum cascade lasers
Simone Biasco,Katia Garrasi,Lianhe Li,Harvey E. Beere,David A. Ritchie,A. Giles Davies,Edmund H. Linfield,Miriam S. Vitiello +7 more
- 06 Sep 2019
TL;DR: In this article, a laterally corrugated wire laser with a top extraction hole array was proposed for terahertz (THz) QCLs, where the distinct periodicities of the lateral corrugation and the top hole array allowed separate control of light feedback and extraction, optimizing the power output and beam divergence.
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Room-Temperature operation of a quantum well mid-infrared detector embedded in nano-antennae array at critical optical coupling
Daniele Palaferri,Yanko Todorov,Azzurra Bigioli,Allegra Calabrese,Li Chen,Lianhe Li,Edmund H. Linfield,Carlo Sirtori +7 more
- 01 Aug 2017
TL;DR: In this article, the authors presented the first room temperature photodection of hundreds on nanowatts using a quantum well mid-infrared detector at 9μm, with a background limited temperature of 82K and a corresponding background-limited specific detectivity of 1.4×1010 cmHz1/2/W.
Electronic structure and optical anisotropy of InGaAs quantum rods studied by photoreflectance and photoluminescence
R. Nedzinskas,Bronislovas Čechavičius,Audrius Česnauskas,J. Kavaliauskas,V. Karpus,Gintaras Valušis,Lianhe Li,Suraj P. Khanna,Edmund H. Linfield +8 more
TL;DR: In this article, photoreflectance (PR) and photoluminescence (PL) spectroscopy techniques were used to identify spectral features associated with interband op- tical transitions occurring in InGaAs quantum rods (QRs) and the surrounding QW regions.
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