Nonlinear hybrid plasmonic slot waveguide for second-harmonic generation

• 作 者: 尹昊智 刘玉敏 俞重远 石强 宫慧 吴秀 宋鑫
• 机 构: State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts
• 出 处: Chinese Optics Letters
• 发表日期: 2013年10期
• 关键词: waveguide harmonic confinement silver symmetric periodically refractive length m

A nonlinear hybrid plasmonic slot waveguide composed of periodically poled lithium niobate(PPLN)and two separated silver films is investigated.The e?ective refractive index,propagation length,and energy confinement of the hybrid anti-symmetric mode in this waveguide are calculated using the structure parameters at the fundamental wavelength ofλ=1550 nm and its second harmonic(SH)λ=775 nm.Through the above indices,coupling e?ciency(maximum SH conversion e?ciency during propagation)and peak position(propagation location of the conversion e?ciency)of SH generation are analyzed.Finally,higher conversion e?ciency can be achieved at a shorter propagation distance by changing the waveguide into a tapered structure.

A nonlinear hybrid plasmonic slot waveguide composed of periodically poled lithium niobate (PPLN) and two separated silver films is investigated. The e? Ective refractive index, propagation length, and energy confinement of the hybrid anti-symmetric mode in this waveguide are calculated using the structure parameters at the fundamental wavelength of λ = 1550 nm and its second harmonic (SH) λ = 775 nm. Through the above indices, coupling e? ciency (maximum SH conversion e? ciency during propagation) and peak position e? ciency) of SH generation is analyzed. Finally, higher conversion e? ciency can be achieved at a shorter propagation distance by changing the waveguide into a tapered structure.