Terahertz quantum-well photodetector

Liu, H. C.; Song, Chunying; SpringThorpe, A. J.; Cao, Jiafeng

doi:10.1063/1.1751620

Cited by 211 publications

(141 citation statements)

References 12 publications

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“…Notable achievements include the invention and advancement of THz quantum cascade lasers (QCLs) 19,20 , sensitive THz photodetectors 21,22 , and THz modulators 23,24 . THz QCLs are electrically-pumped semiconductor-based lasers based on electronic transitions between the subbands of a quantum well superlattice 19 .…”

Section: Introductionmentioning

confidence: 99%

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Zeng

Liang

et al. 2016

ACS Photonics

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Random lasers are a special class of laser in which light is confined through multiple scattering and interference process in a disordered medium, without a traditional optical cavity. They have been widely studied to investigate fundamental phenomena such as Anderson localization, and for applications such as speckle-free imaging, benefitting from multiple lasing modes. However, achieving controlled localized multi-mode random lasing at long wavelengths, such as in the terahertz (THz) frequency regime, remains a challenge.Here, we study devices consisting of randomly-distributed pillars fabricated from a quantum cascade gain medium, and show that such structures can achieve transversemagnetic polarized (TM) multi-mode random lasing, with strongly localized modes at THz frequencies. The weak short-range order induced by the pillar distribution is sufficient to ensure high quality-factor modes that have a large overlap with the active material.Furthermore, the emission spectrum can be easily tuned by tailoring the scatterer size and filling fraction. These "designer" random lasers, realized using standard photolithography 2 techniques, provide a promising platform for investigating disordered photonics with predesigned randomness in the THz frequency range, and may have potential applications such as speckle-free imaging.

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Section: Introductionmentioning

confidence: 99%

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Zeng

Liang

et al. 2016

ACS Photonics

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“…For example, free carrier losses depend on working wavelengths, hence, waveguide structure optimization [1] will be necessary. Also, photodetector background limited infrared performance is influenced by peak detection wavelength and doping density and injector barrier thickness optimization will be required [7].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Dilute magnetic semiconductor quantum-well structures for magnetic field tunable far-infrared/terahertz absorption

Savić

Milanović

Ikonić

et al. 2004

IEEE J. Quantum Electron.

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Article:Savic, I., Milanovic, V., Ikonic, Z. et Abstract-The design of ZnCdSe-ZnMnSe-based quantum wells is considered, in order to obtain a large shift of the peak absorption wavelength in the far infrared range, due to a giant Zeeman splitting with magnetic field, while maintaining a reasonably large value of peak absorption. A triple quantum-well structure with a suitable choice of parameters has been found to satisfy such requirements. A maximal tuning range between 14.6 and 34.7 meV is obtained, when the magnetic field varies from zero to 5 T, so the wavelength of the absorbed radiation decreases from 85.2 to 35.7 m with absorption up to 1.25% at low temperatures. These structures might form the basis for magnetic field tunable photodetectors and quantum cascade lasers in the terahertz range.Index Terms-Infrared detectors, manganese alloys, magnetic field effects, quantum wells, quantum theory, tunable circuits and devices.

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“…The absorption strength is proportional to the squared dipole matrix element hv i jzjv j i 2 (DME). Absorption frequencies from the near-infrared to the THz were demonstrated, [8][9][10] but only in the mid-infrared and near-infrared, room-temperature operation has been reached. Broadband QCDs with response, ranging from about 1100 cm À1 to 2000 cm À1 , were demonstrated.…”

mentioning

confidence: 99%

Diagonal-transition quantum cascade detector

Reininger

Schwarz

Detz

et al. 2014

Applied Physics Letters

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We demonstrate the concept of diagonal transitions for quantum cascade detectors (QCD). Different to standard, vertical QCDs, here the active transition takes place between two energy levels in adjacent wells. Such a scheme has versatile advantages. Diagonal transitions generally yield a higher extraction efficiency and a higher resistance than vertical transitions. This leads to an improved overall performance, although the absorption strength of the active transition is smaller. Since the extraction is not based on resonant tunneling, the design is more robust, with respect to deviations from the nominal structure. In a first approach, a peak responsivity of 16.9 mA/W could be achieved, which is an improvement to the highest shown responsivity of a QCD for a wavelength of 8 μm at room-temperature by almost an order of magnitude.

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Terahertz quantum-well photodetector

Cited by 211 publications

References 12 publications

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Dilute magnetic semiconductor quantum-well structures for magnetic field tunable far-infrared/terahertz absorption

Diagonal-transition quantum cascade detector

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