Surface plasmon-assisted optical switching/bistability at telecommunication wavelengths in nonlinear dielectric gratings

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• 作者：Thu Trang Hoang^a ; Khai Q. Le^b ; Quang Minh Ngo^a ; ^{minhnq@ims.vast.ac.vn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Gratings ; Surface plasmon ; Kerr effect ; Integrated optics
• 刊名：Current Applied Physics
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：15
• 期：9
• 页码：987-992
• 全文大小：1273 K

文摘

In this paper, we numerically investigate nonlinear optical responses in dielectric gratings coated by flat metallic surface, where the structural parameters are chosen for wavelengths of operation at the telecom regime. The presented designs show the output light reflection with respect to the incident intensity of increasing, decreasing, and non-monotonic belt-shape functions. Nonlinear optical responses including switching and bistability appeared in the telecom region owing to assistance of surface plasmon resonance excited at the metal/dielectric interface, which enhances the diffraction efficiency and induces the momentum matching for the leaky modes of the dielectric grating. This results in electric intensity-effective refractive index dependence enhancement in the Kerr nonlinear media. Our design and investigation of the linear and nonlinear optical responses will provide a general guideline for a hybrid metallic-dielectric structure-based optical switching/bistability device design.