1:30 PM - 3:30 PM
[21p-P1-1] Apertureless Probe with V-groove structures for Nanosized Circularly Polarized Light
Keywords:circularly polarized light,apertureless probe,plasmon polariton
Circularly polarized light (CPL) has been used in solid-state physics, e.g. ultrafast all optical magnetic recording, optical communication of spin information, direction control of spin-wave emission, etc. Recently, the spin-relative phenomena are of great interest, and using a nanosized CPL is expected to be one of the most possible ways to clarify these phenomena in nanoscale region. We have proposed an aperture antenna with V-groove structures than can obtain a nanosized CPL with a high intensity. The high intensity enhancement of the CPL is because of the intensity enhancement effect of the channel plasmon-polaritons generated in the V-groove structures. In this report, we proposed a new kind of apertureless probe with V-groove structures to obtain nanosized CPL with a high intensity.
The simulations were carried out using the commercial software package Comsol Multiphysics 4.3b, which is based on finite element method. Four V-groove structures (V-groove angle: 50 degrees) were designed around a truncated conical probe (solid angle: 30 degrees, and the length: 700 nm) symmetrically. A circularly polarized plane wave with a wavelength of 633 nm illuminated the probe along the long axis of the probe. The simulations indicated that a CPL with a FWHM of 10 nm and an intensity enhancement approximately 50 times was obtained using the apertureless probe with V-groove structures.
We consider that this kind of apertureless probe with V-groove structures can be used as a strong CPL source in the apertureless scanning near-field optical microscopy, and prompt the investigation of the spin-related phenomena in nanoscale region.
The simulations were carried out using the commercial software package Comsol Multiphysics 4.3b, which is based on finite element method. Four V-groove structures (V-groove angle: 50 degrees) were designed around a truncated conical probe (solid angle: 30 degrees, and the length: 700 nm) symmetrically. A circularly polarized plane wave with a wavelength of 633 nm illuminated the probe along the long axis of the probe. The simulations indicated that a CPL with a FWHM of 10 nm and an intensity enhancement approximately 50 times was obtained using the apertureless probe with V-groove structures.
We consider that this kind of apertureless probe with V-groove structures can be used as a strong CPL source in the apertureless scanning near-field optical microscopy, and prompt the investigation of the spin-related phenomena in nanoscale region.