论文信息 - Unidirectional radiation of widely tunable THz wave using a prism coupler under noncollinear phase matching condition

Unidirectional radiation of widely tunable THz wave using a prism coupler under noncollinear phase matching condition

A widely tunable THz wave has been parametrically generated and reported recently by us utilizing a LiNbO3 crystal with a monolithic grating coupler under a noncollinear phase matching condition. However, the output direction of the THz wave is strongly dependent on the generated frequency due to the nature of noncollinear phase matching, as well as the grating coupler. In this letter, a novel method for THz coupling is proposed using a low dispersion prism to eliminate almost completely the THz beam deflection for the entire tuning range. The unidirectional THz wave radiation was confirmed theoretically and experimentally for the range of 1–2 THz.

[1] Xiang Zhang,et al. Terahertz beam generation by femtosecond optical pulses in electro‐optic materials , 1992 .

[2] Hu,et al. Terahertz radiation induced by subband-gap femtosecond optical excitation of GaAs. , 1991, Physical review letters.

[3] J. Yardley,et al. Generation of Terahertz Radiation From a Poled Polymer , 1995 .

[4] K. Cheung,et al. Picosecond photoconducting Hertzian dipoles , 1984 .

[5] Kodo Kawase,et al. Characteristics of THz-wave radiation using a monolithic grating coupler on a LiNbO3 crystal , 1996 .

[6] Kodo Kawase,et al. COHERENT TUNABLE THZ-WAVE GENERATION FROM LINBO3 WITH MONOLITHIC GRATING COUPLER , 1996 .

[7] Richard H. Pantell,et al. Continuously tunable submillimeter wave source , 1975 .