Guo Quanxin, Fan Shuzhen, Yin Xiaoqin, Jiao Binzhe, Mu Jiefeng, Ming Na, Guo Liyuan, Yuan Jiasheng, Wang Kaiyu, Zhang Xingyu
Opt Express. 2023 Nov 6;31(23):38970-38976. doi: 10.1364/OE.505363.
The wide applications of terahertz (THz) wave technology in the ∼1-3 THz range has resulted in a surge in the demand for the performance improvement of THz wave detection technique. In this study, a frequency tunable, highly sensitive frequency upconversion detection based on a 2-(3-(4-hydroxystyryl)-5,5-dime-thylcyclohex-2-enylidene) malononitrile (OH1) crystal at room temperature is demonstrated. Moreover, to effectively increase the signal-to-noise ratio in the low frequency range, a beam isolation enhancer is proposed and its effect is verified. The minimum detectable THz pulse energy reaches about 100 aJ at 1.9 THz. The frequency tuning ranging from 1 to 3 THz. Sensitivity comparison with a 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystal system shows that OH1 is a more suitable nonlinear crystal in the 1-2.4 THz range.
太赫兹（THz）波技术在~1 - 3太赫兹范围内的广泛应用导致对太赫兹波检测技术性能提升的需求激增。在本研究中，展示了一种基于2 -（3 -（4 - 羟基苯乙烯基）- 5,5 - 二甲基环己 - 2 - 亚烯基）丙二腈（OH1）晶体在室温下的频率可调谐、高灵敏度频率上转换检测。此外，为有效提高低频范围内的信噪比，提出了一种光束隔离增强器并验证了其效果。在1.9太赫兹时，最小可检测太赫兹脉冲能量达到约100阿焦耳。频率调谐范围为1至3太赫兹。与对甲苯磺酸4 - 二甲基氨基 - N - 甲基 - 4 - 苯乙烯基吡啶鎓（DAST）晶体系统的灵敏度比较表明，OH1在1 - 2.4太赫兹范围内是更合适的非线性晶体。
