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Photon-counting microscopy of terahertz radiation
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Optical micrograph of the QD photon detector fabricated in a . Metal gates define the QD ) when negatively biased as shown in the inset (a scanning electron micrograph) and serve also as a bow-tie antenna that couples incident terahertz waves to the QD. (b) Real time traces of the photon-counting signals (conductance switches) at . Three curves display results obtained in different schemes. A lock-in modulation technique yields a response time constant of (bottom). A faster response with and (middle and top) are obtained in a constant voltage mode, where denotes the cutoff frequency of the low-pass filters used. (c) Schematic diagram of the photon-counting microscope.

Image of FIG. 2.
FIG. 2.

(Color) (a) Rates of terahertz photon counting, detected in the QH state at , are color mapped (red, ; blue, ). The terahertz photons are of or the wavelength of . (b) The emission on the drain corner is made visible by enhancing the sensitivity on the expanded scale by a factor of 1.5. [(c)–(e)] SET conductance switches showing the events of photon arrival to the detector from different positions: the drain corner (c), the bulk region (d), and the source corner (e). (f) Terahertz photon-counting images with the opposite polarities of the current and the magnetic field.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Photon-count rate vs the source-drain bias voltage (bottom axis). The values of current are marked on the top axis. The circles and the triangles represent the data on the source and the drain corners, respectively. [(b) and (c)] Schematic representations of the energy profile on the electron entry corner at and on the exit corner at .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Photon-counting microscopy of terahertz radiation