Abstract:We present a new type of aperture antenna with V-groove structures that are made of Au to enhance strong circularly polarized light (CPL). Simulations using the finite element method revealed that strong CPL was enhanced within the aperture with a diameter of 10 nm. The intensity of the electric field was enhanced and was 22,700 times greater than that of the incident light. The channel plasmon polaritons generated in the V-groove structures were responsible for the strong enhancement. The influence of the ang… Show more
“…On the other hand, one peak appeared at the bottom of the vertical groove, which was due to the channel surface plasmon. (6) We considered that the simulation results agreed with the experimental results very well.…”
Section: Simulation Based On Finite Element Methods (Fem)mentioning
confidence: 72%
“…(3) Moreover, controlling polarization with SPPs has attracted much attention. Significant techniques that combine SPPs with nano-antennas to generate nanosized circularly polarized light have been reported, (4)(5)(6) because nanosized circularly polarized light could be useful in significant phenomena, such as magnetization reversal using a 40 femtosecond circularly polarized laser pulse (7) and spin excitation. (8) Many techniques utilize localized surface plasmons (LSPs).…”
We measured the distribution of surface plasmon polaritons (SPPs) on cross grooves fabricated in Au film by apertureless scanning near-field optical microscopy (aSNOM). SNOM signals around horizontal and vertical grooves had double peaks and a single peak, respectively. To understand these different behaviors, we carried out simulations by the finite element method. From the simulation results, we found that the double peaks that appeared near the left and right edges of the horizontal groove were due to localized surface plasmons (LSPs). On the other hand, the strong signal that appeared near the center of the vertical groove was due to channel plasmon polariton. The SPP excitation depended on the direction of the electric field of the incident light and the cross sections of the grooves. This experiment reveals that aSNOM is a powerful tool for observing the distribution of SPPs on the nanoscale.
“…On the other hand, one peak appeared at the bottom of the vertical groove, which was due to the channel surface plasmon. (6) We considered that the simulation results agreed with the experimental results very well.…”
Section: Simulation Based On Finite Element Methods (Fem)mentioning
confidence: 72%
“…(3) Moreover, controlling polarization with SPPs has attracted much attention. Significant techniques that combine SPPs with nano-antennas to generate nanosized circularly polarized light have been reported, (4)(5)(6) because nanosized circularly polarized light could be useful in significant phenomena, such as magnetization reversal using a 40 femtosecond circularly polarized laser pulse (7) and spin excitation. (8) Many techniques utilize localized surface plasmons (LSPs).…”
We measured the distribution of surface plasmon polaritons (SPPs) on cross grooves fabricated in Au film by apertureless scanning near-field optical microscopy (aSNOM). SNOM signals around horizontal and vertical grooves had double peaks and a single peak, respectively. To understand these different behaviors, we carried out simulations by the finite element method. From the simulation results, we found that the double peaks that appeared near the left and right edges of the horizontal groove were due to localized surface plasmons (LSPs). On the other hand, the strong signal that appeared near the center of the vertical groove was due to channel plasmon polariton. The SPP excitation depended on the direction of the electric field of the incident light and the cross sections of the grooves. This experiment reveals that aSNOM is a powerful tool for observing the distribution of SPPs on the nanoscale.
“…This result indicates the difficulty of measuring the optical responses due to circular polarization, such as CD and MO effect, by using a-SNOM, which is consistent with the theoretical prediction [31]. To overcome this problem, we need to consider another type of tip that can produce nano-sized circular polarized light [32].…”
Polarization properties of apertureless-type scanning near-field optical microscopy (a-SNOM) were measured experimentally and were also analyzed using a finite-difference time-domain (FDTD) simulation. Our study reveals that the polarization properties in the a-SNOM are maintained and the a-SNOM works as a wave plate expressed by a Jones matrix. The measured signals obtained by the lock-in detection technique could be decomposed into signals scattered from near-field region and background signals reflected by tip and sample. Polarization images measured by a-SNOM with an angle resolution of 1°are shown. FDTD analysis also reveals the polarization properties of light in the area between a tip and a sample are p-polarization in most of cases.
“…This result indicates the difficulty of measuring the optical responses due to circular polarization, such as CD and MO effect, by using a-SNOM, which is consistent with the theoretical prediction [ 31 ]. To overcome this problem, we need to consider another type of tip that can produce nano-sized circular polarized light [ 32 ]. Fig.…”
Polarization properties of apertureless-type scanning near-field optical microscopy (a-SNOM) were measured experimentally and were also analyzed using a finite-difference time-domain (FDTD) simulation. Our study reveals that the polarization properties in the a-SNOM are maintained and the a-SNOM works as a wave plate expressed by a Jones matrix. The measured signals obtained by the lock-in detection technique could be decomposed into signals scattered from near-field region and background signals reflected by tip and sample. Polarization images measured by a-SNOM with an angle resolution of 1° are shown. FDTD analysis also reveals the polarization properties of light in the area between a tip and a sample are p-polarization in most of cases.
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