We demonstrated a magneto-optic spatial light modulator with one-step pattern formation of iron-garnet films on ion-milled substrates by LPE. The one-step pixel growth is based on the combination of a single-crystal epitaxial film growth (pixel area) by LPE and a impeded film growth (pixel gap area) on a substrate whose surface has been locally damaged and milled by ion bombardment before film deposition. This method overcomes the disadvantages associated with groove etching of the conventional MOSLM. The fabricated prototype MOSLM is switched by applying driving currents of 40 mA for the bottom conductor line and 80 mA for the top conductor line under external bias field of 20 Oe, which is over 2 times smaller than that of the conventional MOSLM. These results strongly suggest that the novel MOSLM can provide higher resolution, simpler fabrication process, more compact systems and lower driving current. Also, the selective-area LPE method offers new possibilities for the fabrication of integrated magneto-optic light switch arrays, magnetic waveguides and similar devices.
This work was aimed at fabrication of a three-dimensional magento-photonic crystal. In our experiments LATEX spheres with diameter of about 200 nm were coated with Fe3O4 fine particle. The diameter of Fe3O4 fine particles is about 30 nm when ration of Fe3+ / Fe2+ (r) = 3% and pH = 8.6. The diameter of these particles decreases about 10 nm by increasing up to r=20% in the same pH region. It was found that a decrease of the coated particles size can be made as low as the size of 5% of LATEX spheres diameter. Therefore, it may use these particles for preparation a three-dimensional magento-dielectric structure.
We demonstrated a flat-surface magneto-optic spatial light modulator (MOSLM) without physically isolated pixels and an external bias coil. The flat-surface MOSLM, which was fabricated by a simple process, was designed as a compact system with a high resolution and very low driving current. Flat-surface pixels for the novel MOSLM were magnetically isolated and produced by the combinatory use of the local annealing effect that reduced magnetization 4πMs of pixel areas and the stress effect that produced sharp variations of magnetic anisotropy in a magnetic garnet film under the edge of a metal layer. The novel MOSLM can provide a higher resolution, a simpler fabrication process, more compact systems and a lower driving current than the conventional MOSLM.
In this paper, results of the first observation of magnetization-induced second-harmonic generation (SHG) in one-dimensional magneto-photonic microcavities are described. Both significant magnetization-induced rotation of second-harmonic wave polarization and magnetization-induced variations of the SHG intensity are detected at the fundamental wavelengths in the vicinity of microcavity mode.
We have measured linear velocity dependency of overwriting erasability and jitter. It was found that overwriting jitter correlates with overwriting erasability which reflects the degree of mark distortion. A 5-layered disk was developed whose absorptivity of crystalline state was larger than that of amorphous state. This disk showed small jitter, which was less than 16% and 15m/s when the bit length was 0.45 micrometers /bit without applying a writing compensation. And we have studied land/groove recording at relativley low linear velocity of 4.5 m/s. Crosstalk both from land and groove were lower than -26db in the recording pitch of 0.7 micrometers , which is sufficiently small for practical use. The bit length of 0.45 micrometers /bit and the recording pitch of 0.7 micrometers realize 2.6 Gbytes in 120 mm, supposing that user data capacity is three quarters of the total capacity.
Mass production technology of phase-change rewritable disks can be achieved by using a pass-through type in-line sputtering system. The qualities of the mass-produced PCR disk were high enough to satisfy all the specifications for this product. We optimized the composition of the recording layer (SbTeGe alloy) of the PCR disk. It was found that a Ge content of more than 20 at% in the recording layer is necessary to achieve a long archival life. The mass-produced PCR disks were very stable in the accelerated aging test. The BER stayed at nearly the same value for 2000 hrs at 90 degree(s)C, 80% RH and 4000 hrs at 80 degree(s)C, 80% RH. The life of the PCR disks was estimated to be greater than 50 years at 30 degree(s)C, 80% RH. The activation energy for the PCR disks obtained from Arrhenius plots was 1.11 eV.
The possibility of ultrahigh density recording has been shown using an overwritable phase change optical disk with a Ge-Te-Sb recording film. It was found that recording marks of 0.2 micrometers length can be formed stably and that high contrast ratio can be obtained in the wide range of wavelength. From these results, about six times as high linear density as the existing format is possible by using mark-edge recording or MCAV method. It was also found that the crosstalk of PCE optical disk is so small that double track density recording is possible by track pitch reduction or groove/land recording. These results show a possibility of large capacity of 10 GB for 5.25 inch diameter disk.
Correlation of overwriting performance and disk structure of phase change erasable optical disk was investigated using Ge-Te-Sb recording material. It was found that quadrilayered structure is superior in cyclability to trilayered structure because molten material is liable to flow along the track in the case of the trilayered structure. A million cycle BER (bit error rate) stability was achieved by applying new writing method to the quadrilayered structure.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.