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An optoelectronic mixer based on the nonlinear photoconductivity of black phosphorus is presented. We demonstrate mixing with a maximum conversion loss of 31 dB at local oscillator frequencies up to 640 MHz.
We study the THz optoelectronic photoresponse of a thin flake of black phosphorus that is fabricated by mechanical exfoliation. THz Illumination at an average power of 10 mW produces a photocurrent in the nA range.
We report terahertz pump-probe experiments on multilayer graphene that measure both reflected and transmitted radiation. The data reveal complex reflection and transmission dynamics which calculations attribute to a transition from interband to intraband processes.
The intrinsic speed of a black phosphorus photoconductive detector is determined using pulsed autocorrelation photocurrent measurements. The data reveals two timescales of 125 ps and 775 ps, indicating fast photodetection is possible with black phosphorus photoconductive detectors.
We study the response of a graphene photothermoelectric-based detector illuminated by two continuous-wave optical beams. The power and frequency dependence of the photoresponse are used to probe the graphene hot-electron cooling rates and mechanisms.
The temporal response of a broadband, monolayer graphene photodetector based on the photothermoelectric effect is characterized. Pulse-coincidence and impulse response measurements indicate fast photodetection on the timescale of 10 ps.
The responsivity of a monolayer graphene photodetector based on the photo-thermoelectric effect was measured at room temperature for dc, terahertz, and optical frequencies and found to be approximately 81, 188, and 18 V/W respectively.
Nonlinear absorption and refraction coefficients of nanoporous silicon are reported and found to be enhanced compared to those of crystalline silicon. A pump-probe measurement showing the temporal character of the nonlinearity is also presented.
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