Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of the Society of Information Storage Systems
Journal Basic Information
Journal DOI :
The Society of Information Storage Systems
Editor in Chief :
Volume & Issues
Volume 4, Issue 1 - Mar 2008
Selecting the target year
Super Resolution Readout in Near Field Optical Data Storage System
Lee, Jin-Kyung ; Jeong, An-Sik ; Shin, Jong-Hyun ; Kim, Joo-Ho ; Lee, Kyung-Geun ; Kim, Joong-Gon ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Society of Information Storage Systems, volume 4, issue 1, 2008, Pages 1~5
Super-resolution near-field structure (super-RENS) technology and solid immersion lens (SIL) based near-field (NF) technology have been expected as promising approaches to increase data capacity or areal density of optical disc. Super-RENS technology has been studied until now using mainly numerical aperture (NA) of 0.85 far-field optical system and possibility of tangential data density increment have been presented. NF technology has been studied with NA over 1 and presented demonstration of removable performance. To achieve much higher density, approach to increase NA of super-RENS by NF technology (Near-Field Super-Resolution, NFSR) can be a candidate and we think this technology would be advantageous compared to wavelength reduction or much higher NA increment of NF technology or much smaller effective optical spot size reduction of far-field super-resolution technology. In this paper we present readout result of ROM media having monotone pits using NF optical system with wavelength of 405nm and NA of 1.84 surface type SIL. GeSbTe material was used for super resolution active layer and pit length is 37.5nm which is shorter than resolution limit 55nm. We present the feasibility of NFSR technology by confirming the CNR threshold according to readout power (Pr) and CNR 33dB over threshold Pr.
Design Optimization of Micro Thermal Actuator Considering Structural Performance
Hwang, Kyung-Ho ; Lee, Jong-Soo ;
Transactions of the Society of Information Storage Systems, volume 4, issue 1, 2008, Pages 6~12
The paper deals with the numerical analysis and design optimization of polysilicon micro thermal flexure actuator. The deflection of a thermal actuator is implicitly related to the actuation time so that such deflection is to be maximized under the consideration of structural performances such as maximum stress and natural frequencies. At first, the structural formulation of a thermal actuator is reviewed, and its CAE based simulation is performed to verify the numerical model. A parametric study is then conducted to identify the mainly effective design variables. Finally, the design of a micro thermal actuator is explored in the context of deterministic optimization and reliability based design optimization in the present study.
Enhancement of cover-layer surface properties using dielectric protective layer
Kim, Jin-Hong ; Lim, Jung-Shik ; Lee, Jun-Seok ; Seo, Jeong-Kyo ;
Transactions of the Society of Information Storage Systems, volume 4, issue 1, 2008, Pages 13~18
Scratches are observed on a polymer cover-layer of near-field recording (NFR) media after a servo test with rotating disc. The scratches are formed by the collision of a solid immersion lens (SIL)-media. One of the possible ways to avoid the scratch problem is to coat a dielectric protective film on the polymer cover-layer which enhances the hardness of the surface. The surface with hard characteristics in the surface reduces the scratch problem in the cover-layer. Not only the mechanical properties but also the optical properties should be controlled. Specifically, the refractive index of the dielectric protective film should be matched with the polymer cover-layer not to lose light at the interface due to the difference of the refractive index. The refractive index of the dielectric film can be tailored by controlling process parameters during sputtering and matched with that of the polymer cover-layer.
A Study on Assembly and Evaluation of SIL optical Head for surface Recording of SIL based NFR
Min, Cheol-Ki ; Kim, Tae-Seob ; Yoon, Yong-Joong ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Society of Information Storage Systems, volume 4, issue 1, 2008, Pages 19~22
For the assembly and evaluation of solid immersion lens (SIL) optical head which is the key component of SIL based near field recording (NFR) technology, we modify the Twyman-Green interferometer. Super-hemisphere SIL optical head for the surface recording is assembled and evaluated by the modified Twyman-Green interferometer. In order to verify the optical performance of the assembled SIL optical head, we compare the measured results of the SIL optical head with the simulation ones. Finally, we show the feasibility of applying the assembled SIL optical head to near field recording system by the experiment of the dynamic gap control based on test bed.
Development of Moving Magnet Type Optical Pickup Actuator
Hur, Young-Jun ; Kim, Yoon-Ki ; Song, Myeong-Gyu ; Kim, Sang-Ryong ; Park, No-Cheol ; Yoo, Jeong-Hoon ; Park, Young-Pil ;
Transactions of the Society of Information Storage Systems, volume 4, issue 1, 2008, Pages 23~28
In this paper we suggested the moving magnet type actuator for optical disc drive which has high frequency of flexible mode. Generally, moving magnet type actuator has the advantage for increase the frequency of flexible mode. But it has low driving sensitivity due to the weight of its moving part. To overcome this shortcoming, we designed the model with the closed electromagnetic circuit for tracking direction. In addition, we improved the driving sensitivity and frequency of flexible mode by using of DOE (design of experiment) procedure for EM circuit. Consequently, it is verified that final designed model satisfied with the desired specifications.