2016
DOI: 10.1002/lpor.201600199
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Enhancement of terahertz photoconductive antenna operation by optical nanoantennas

Abstract: Photoconductive antennas are promising sources of terahertz radiation that is widely used for spectroscopy, characterization, and imaging of biological objects, deep space studies, scanning of surfaces, and detection of potentially hazardous substances. These antennas are compact and allow for generation of both ultrabroadband pulses and tunable continuous wave terahertz signals at room temperatures, with no need for high‐power optical sources. However, such antennas have relatively low energy conversion effic… Show more

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Cited by 142 publications
(138 citation statements)
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References 204 publications
(379 reference statements)
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“…Further optimization of mutual designs of the both, QD laser and QD antenna wafer, for even more efficient conversion efficiency, and a comprehensive antenna electrodes design for better radiative properties at the frequencies of interest, as well as an inclusion of optical nanoantennas into the antenna gap [35], will result in significantly more power efficient operation and potentially will lead to the development of a practical, compact, sufficiently-powerful and reasonably-cheap, roomtemperature tunable THz source.…”
Section: Discussionmentioning
confidence: 99%
“…Further optimization of mutual designs of the both, QD laser and QD antenna wafer, for even more efficient conversion efficiency, and a comprehensive antenna electrodes design for better radiative properties at the frequencies of interest, as well as an inclusion of optical nanoantennas into the antenna gap [35], will result in significantly more power efficient operation and potentially will lead to the development of a practical, compact, sufficiently-powerful and reasonably-cheap, roomtemperature tunable THz source.…”
Section: Discussionmentioning
confidence: 99%
“…Furthermore, the space-charge screening effect, i.e., the separation of electrons and holes induces polarization that cancels the electric field, which depends on time-varying carrier distributions, is not captured in the FEM-based approach. This effect is important for understanding the high-power saturation effect in PCDs and has been extensively studied [4], [17], [18].…”
Section: Introductionmentioning
confidence: 99%
“…Using this approach and an LT-GaAs substrate with a 5 μm gap size, THz pulses with a peak field of 36 kV cm −1 were generated with an efficiency of 2×10 −3 [37]. Plasmonic gratings and nanoantennas are another approach that have been tested [38][39][40]. These specific structures increase light absorption and reduces the average photo-carrier transport path, allowing the collection of a larger number of carriers on a sub-picosecond time scale, thus increasing quantum efficiency.…”
Section: Introductionmentioning
confidence: 99%