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Recently, there has been growing interest in terahertz (THz) wave generationfrom liquids under optical excitation. Here, we propose and demonstrate the useof liquid lines in place of liquid films as THz emitters to boost THz signals.The geometry of the emitter eliminates the total internal reflection at theflat liquid-air interface. In addition, we observe that the polarity of theliquid has a significant influence on the THz wave generation. Alpha-pinene, anonpolar liquid, offers much stronger THz radiation than water does. Besidespaving the way to develop intense liquid THz sources, our work indicates thatTHz waves could be a tool for the further study of laser-liquid interaction.

Investigation of liquid lines as terahertz emitters under ultrashort optical excitation