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Branchlike nano-electrodes for enhanced terahertz emission in photomixers

机译：分支状纳米电极可增强光混合器中的太赫兹发射

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摘要

Branchlike nano-electrode structures were found to improve the THz emission intensity of a photomixer by approximately one order of magnitude higher than that of a photomixer with one row of nano-electrodes separated by the same 100 nm gap. The enhancement is attributed to a more efficient collection of generated carriers, which is in turn due to a more intense electric field under the branchlike nano-electrodes' structures. This is coupled with an increased number of effective areas where strong tip-to-tip THz field enhancements were observed. The optical-to-THz conversion efficiency of the photomixers with the new branchlike nano-electrodes was found to be 10 times higher. The more efficient THz photomixer will greatly benefit the development of continuous-wave THz imaging and spectroscopy systems.
机译：发现分支状纳米电极结构将光混合器的THz发射强度提高了约一倍，其中一排纳米电极被相同的100 nm间隙隔开。增强归因于所产生的载流子的更有效收集，这又归因于在分支状纳米电极的结构下更强的电场。伴随着有效区域数量的增加，可以观察到从尖端到尖端的太赫兹场增强。发现具有新的分支状纳米电极的光混合器的光-THz转换效率要高10倍。效率更高的太赫兹光混频器将极大地有益于连续波太赫兹成像和光谱系统的开发。

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