[6p-PA3-1~22] 3.12 Nanoscale optical science and near-field optics

△ [6p-PA3-10] Retardation modulation using electrostatically Au nanograting

〇Yuji Koto¹, Yuki Jokoji¹, Takuya Kinoshita², Takashi Shimura², Kentaro Iwami², Norihiro Umeda² (1.Sch. Eng. ,Tokyo Univ. of Agriculture and Technology, 2.Grad. Sch. Eng. ,Tokyo Univ. of Agriculture and Technology)

Keywords:retardation modulation, Au nanograting, electrostatic actuator

We report retardation modulation using electrostatically driven Au nanograting. Gold nanograting induces giant birefringence at visible wavelength range. In this study, gold nanograting consists of alternately placed fixed beams and movable beams on a glass substrate is fabricated, and retardation modulation is demonstrated by actuating the movable beams in the direction normal to the device plane by electrostatic force. The device produces maximum retardation modulation quantity of 32.4 degrees at the wavelength of 624 nm.