An efficient and compact method of introducing light into a magnetic recording head
for use in Heat Assisted Magnetic Recording (HAMR) is proposed. The technique uses a polymer
waveguide to source light into a novel metallic structure consisting of a sub-wavelength C-aperture
waveguide with a 90° bend and a tapered section. The structure is modeled using Finite
Difference Time Domain (FDTD) simulations and it is shown that the 90° bend allows for low loss
near-field optical access into a conventional magnetic recording head while the tapered C-waveguide
allows for maximum input coupling and a minimum spot size at the recording media.
In this study, small sized optical pickup corresponding to blu-ray disc specifications has been developed in the array using wafer level packaging technology and verified that signal balance was satisfied with specifications.
This paper addresses the design, fabrication and packaging issues of SSOP(super slim optical pickup) module using blury technology. By using blu-ray technology, which uses a 407nm LD (Laser Diode) and an objective lens having NA (Numerical Aperture) 0.85, storage devices become miniaturized but have a high capacity. The developed prototype
uses the integrated structure of a SiOB (Silicon Optical Bench) and a mirror substrate. The SiOB should be processed in order that a thin film PD(Photodiode) and interconnections, LD, Lens, QWP(Quarter Wave Plate) and HOE can be placed, and on the Silicon Substrate should Micromachined Silicon Mirror be formed. The SiOB is aligned and bonded
with the wafer on which Silicon Mirror was formed. Then, it is diced. Because it is fabricated through this order, the super slim optical pickup can be fabricated by using wafer-level process. As a final step LD on the SiOB and HOE are mounted, assembled and bonded using an active alignment. The proposed SSOP was prototyped and characterized by measuring wavefront error and detecting static focusing and tracking error signals.
As a popularity of a portable digital device such as a cellular phone, a digital camera and a MP3 player is spreading, the demand of the mobile storage device increases rapidly. A Blu-ray technology using 406nm laser diode and 0.85 NA(Numerical Aperture) satisfies a miniaturization and a high capacity which are the requirements of the portable device. Because a Blu-ray optical storage device can store 1.5Gbyte on a 3cm disk, it is possible to distribute the media in great quantities and with cheaper price. In this paper, we analyze the optical performance of the hybrid micro lens which is manufactured using a micro fabrication technology. The measurements of the optical power, the spot size and the wavefront error are performed to evaluate the hybrid micro lens with 0.85 NA and the designed wavelength of 406nm. Using the measured data, we estimate if the performance of hybrid micro lens corresponds to the designed performance. Also, the processes of measuring an optical performance of hybrid micro lens, which is composed of the refractive lens and the diffractive lens, are proposed using laser diode of 406nm and finite optics.
We have developed diffractive optical element (DOE) to compensate chromatic aberration happened in aspheric lens surfaces in micro optical system. The DOE was generated with grayscale lithography using high-energy-beam-sensitive (HEBS)-glass, and we finally obtained DOEs having 4levels and 8levels through this fabrication.