Jen-Yu Fang

High-transmission hybrid-effect-assisted nanoaperture

We present a C-aperture encircled by a groove that makes possible the hybrid effect of coupling surface plasmon resonance to propagating waves. Compared to a single C aperture, the groove-encircled aperture can increase transmission by a factor of 2.45 in the near field and by a factor of 1.88 in the far field, showing good agreement with our theoretical calculation.

Double-Corrugated C-Shaped Aperture for Near-Field Recording

We applied surface corrugations surrounding the C-aperture on both incident and exit interfaces of the metal film, which can generate surface plasmon (SP) waves coupling to the propagation mode and function as a focusing grating, respectively. Compared with a 60 nm square aperture, the double-corrugated C-aperture can enhance power throughput by five orders of magnitude and reduce spot area by 30%.

Optical Feedback Height Control System Using Laser Diode Sensor for Near-Field Data Storage Applications

We demonstrated a laser diode position sensor for a near-field height control system. The feedback signal of the laser diode sensor that resulted from self-mixing interferometry was characterized and modeled by a simplified method. Due to the fine spatial resolution of the laser sensor, an active height control system with nanoscale position precision was designed and realized under a spinning disk for near-field applications.

Hybrid-effect transmission enhancement induced by oblique illumination in nano-ridge waveguide

In a nano-ridge waveguide under oblique illumination, we demonstrated transmission enhancement resulting from a hybrid effect between propagation modes and surface plasmon wave. The measured near-field intensity with 44-degree illumination was 1.6 times higher than that illuminated with normal incident light. Consequently, a wedge-shaped fiber probe was proposed to serve as a compact near-field light source.

Dual-probe near-field fiber head with gap servo control for data storage applications

We present a novel fiber-based near-field optical head consisting of a straw-shaped writing probe and a flat gap sensing probe. The straw-shaped probe with a C-aperture on the end face exhibits enhanced transmission by a factor of 3 orders of magnitude over a conventional fiber probe due to a hybrid effect that excites both propagation modes and surface plasmon waves. In the gap sensing probe, the spacing between the probe and the disk surface functions as an external cavity. The high sensitivity of the output power to the change in the gap width is used as a feedback control signal. We characterize and design the straw-shaped writing probe and the flat gap sensing probe. The dual-probe system is installed on a conventional biaxial actuator to demonstrate the capability of flying over a disk surface with nanometer position precision.

P-111: Multi-Performance Film (MPF) for Highly Efficient LCD Backlights

A multi-performance film (MPF) which has concave-parabolic cylinder micro prism structures was proposed to improve light coupling efficiency and to reduce lamp-Mura defect. A MPF combined light diffusion and light collecting performance as a multiple functional film. By applying the MPF, wider FWHM angle, higher light output coupling efficiency, and slighter lamp-Mura were demonstrated on a 32-inch direct-type backlight.

Microprobe with Wedge-Shaped Graded-Index Fiber Lens for Near-Field Recording Applications

We demonstrated a microprobe with wedge-shaped graded-index fiber lens as near-field optical source, which provides maximum power throughput up to 1.7 at 45° incidence, an enhancement factor of 104 compared with a 60-nm square aperture.

Extraordinary Optical Transmission Enhancement of Asymmetric Nano-Aperture with Surface Corrugation

We presented an asymmetric nano-aperture with surface corrugation characterized by propagation mode and surface plasmon polaritons to provide extraordinary optical transmission enhancement of 105 compared with a 60-nm square aperture at spot size of 0.2λ.