2 research outputs found
Creating Optical Near-Field Orbital Angular Momentum in a Gold Metasurface
Nanocavities
inscribed in a gold thin film are optimized and designed to form a
metasurface. We demonstrate both numerically and experimentally the
creation of surface plasmon (SP) vortex carrying orbital angular momentum
in the metasurface under linearly polarized optical excitation that
carries no optical angular momentum. Moreover, depending on the orientation
of the exciting linearly polarized light, we show that the metasurface
is capable of providing dynamic switching between SP vortex formation
or SP subwavelength focusing. The resulting SP intensities are experimentally
measured using a near-field scanning optical microscope and are found
in excellent quantitative agreements as compared to the numerical
results
Creating Optical Near-Field Orbital Angular Momentum in a Gold Metasurface
Nanocavities
inscribed in a gold thin film are optimized and designed to form a
metasurface. We demonstrate both numerically and experimentally the
creation of surface plasmon (SP) vortex carrying orbital angular momentum
in the metasurface under linearly polarized optical excitation that
carries no optical angular momentum. Moreover, depending on the orientation
of the exciting linearly polarized light, we show that the metasurface
is capable of providing dynamic switching between SP vortex formation
or SP subwavelength focusing. The resulting SP intensities are experimentally
measured using a near-field scanning optical microscope and are found
in excellent quantitative agreements as compared to the numerical
results