An electromagnetic wave generating device is provided which includes an optical waveguide including a plurality of waveguide segments (101,104,107) such that the main lobe (111) of a combined electromagnetic wave has a substantially single large directivity. The electromagnetic wave generating device includes the -optical waveguide -including a plurality of waveguide segments (101,104,107) each of which is sandwiched between dielectrics (10,11) includes a nonlinear optical crystal- The waveguide segments are arranged such that an angle (2θc) formed by the directions of propagation of light in two adjacent, waveguide segments (101,104,107) substantially corresponds to 2θc- When nq denotes the refractive index of the nonlinear optical crystal for light and εeff denotes the effective relative permittivity of an assembly of the dielectrics (10,11) and the waveguide segments (101,104,107) for an electromagnetic wave, θc is defined as θc - cos-1 (ng/√εeff) ·
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机译：提供一种电磁波产生装置，该电磁波产生装置包括光波导，该光波导包括多个波导段（101，104，107），使得组合的电磁波的主瓣（111）具有基本上单一的大方向性。电磁波产生装置包括光波导，该光波导包括多个波导段（101,104,107），每个波导段被夹在包括非线性光学晶体的电介质（10,11）之间。波导段的布置使得角度（2θ<由光在两个相邻的波导段（101,104,107）中的传播方向形成的Sub> c ）基本上对应于2θ c-，当n q 表示非线性光学晶体对光的折射率和ε eff 表示电磁波的电介质（10,11）和波导段（101,104,107）的组件的有效相对介电常数θ c 定义为θ c -cos -1 （n g /√ε eff ）·
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