27 مهر 1398
محمدرضا محبي فر

محمدرضا محبی فر

مرتبه علمی: استادیار
نشانی: ملایر، کیلومتر 4 جاده اراک، دانشگاه ملایر، دانشکده علوم پایه، گروه فیزیک
تحصیلات: دکترای تخصصی / فیزیک-اپتیک و فوتونیک
تلفن: +988132355404
دانشکده: علوم پایه

مشخصات پژوهش

عنوان
OPTICAL FORCE NEAR THE LASER ILLUMINATED TAPERED TIP
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Optical antenna, Surface Plasmon, Optical force, Tapered tip, Finite difference Time Domain (FDTD).
سال
2019
مجله Belgorod State University Scientific Bulletin - Mathematics. Physics
پژوهشگران محمدرضا محبی فر

چکیده

Optical near-fields are localized to the source region of optical radiation or to the surfaces of materials interacting with free radiation. Due to the high field gradients of evanescent waves, strong forces are predicted in optical near-fields. In this paper, by solving Maxwell's equations with Finite difference Time Domain (FDTD) simulation based on the numerical software, the effect of changing the period of grating on the optical force around tapered tip with 90 degree laser beam incident angle was studied. The optimization results show that optimum value for period of circular gratings in order to achieve maximum optical force enhancement 208 nm was obtained. This maximum optical force is 1.4 × 10−14 N/W and occurs when laser wavelength is 655 nm.