Browsing by Author "Chiu, Y"

Now showing 1 - 9 of 9

Fabrication and nonlinear optical properties of nanoparticle silver oxide films
(2003-08-01)
Chiu, Y
;
Rambabu, U
;
Hsu, MH
;
Shieh, HPD
;
Chen, CY
We report the fabrication of nanoparticle silver oxide thin films by rf magnetron sputtering and characterization of their nonlinear optical properties. The chemical decomposition and reversibility of AgOx compounds were studied by thermogravimetric analysis, differential scanning calorimetry, and x-ray diffraction. Electron spectroscopy for chemical analysis measurements revealed a 0.5 eV negative binding energy shift from AgO to Ag2O phase. The effect of particle plasmon resonance was confirmed by the absorption band shift with increased Ag2O Particle size. The measured third-order nonlinear susceptibility (chi(3) = 3.4 x 10(-7) esu) and response time (27 ps) of the Ag2O nanoparticles makes it promising for applications in all-optical switching devices and optical data storage systems. (C) 2003 American Institute of Physics.
Fiber-lens-based module for optical recording applications
(2003-07-01)
Tien, CH
;
Chou, HL
;
Chiu, Y
;
Hsu, W
;
Milster, TD
An optical fiber-lens-type pickup with numerical aperture (NA) congruent to 0.27 was demonstrated for thermal recording of continuous 1.6-mum-wide lines on MO disks with 50% throughput efficiency. Moreover, a Si-micromachined near-field module integrated with a fiber lens, solid immersion lens (SIL), and submicron aperture was fabricated to improve the mechanical fragility and increase the NA of the optical-fiber-based pickup. The preliminary configuration design and measurement suggest the feasibility of the module as a submicron heat source for high-density optical data storage.
High-extinction-ratio micro polarizing beam splitter for short wavelength optical storage applications
(2005-12-12)
Lee, CH
;
Chiu, Y
;
Shieh, HPD
;
電控工程研究所
;
光電工程學系
A surface-micromachined high-extinction-ratio polarizing beam splitter (PBS) using low absorptive silicon nitride layers for blue wavelength applications are demonstrated. The micro polarizing beam splitter consists of novel stack of two silicon nitride layers separated by an air gap. A PBS optimization model is established to achieve both high extinction-ratio and adequate process margin. The polarization extinction ratios of 25 dB for the reflected light and 15 dB for the transmitted light were experimentally achieved lambda=405 nm. The fabrication of the PBS is compatible with other micro diffractive elements to build a micro optical bench, thus, feasible for short wavelength optical storage applications. (c) 2005 Optical Society of America.
Integrated near-field optical head for hybrid recording
(2003)
Chiu, Y
;
Wu, M
;
Shieh, HPD
;
Sun, YT
;
Chou, HL
As the recording density of longitudinal magnetic storage increases at a 100% annual growth rate, it will soon approach the superparamagnetic limit where the thermal energy at room temperature starts to induce thermal instability to the grains in the small recorded marks. Thermal magnetic recording schemes, such as those used in magneto-optical recording, help alleviate the problems with the superparamagnetic limit. Recently, a hybrid recording system was proposed where data were recorded thermal magnetically on a magneto-optical disk and read back with a GMR head. In this paper, we propose an integrated planar head that combines an optical fiber lens, a solid immersion lens, a sub wavelength aperture, a micro coil, an air bearing surface, and a GMR head for such a hybrid recording system. Preliminary fabrication and calculation are discussed.
MEMS-based miniature optical pickup
(2005-02-01)
Chiu, Y
;
Chen, CH
;
Chiou, JC
;
Fang, WL
;
Shieh, HPD
The technology challenges for miniature optical pickups include high-numerical-aperture objective lens design, servo actuator functions and performance, and component assembly tolerance. In this paper, a microelectromechanical systems (MEMS)-based miniature optical pickup is proposed for DVD and blue disk systems. A high-order diffractive objective lens with a continuous surface relief is designed. Focus, tilt, and tracking servos are implanted with MEMS micro actuators. Preliminary design and test results are presented.
Micro polarizing beam splitter for blue wavelength optical pickups application
(2005)
Lee, CH
;
Tsai, WL
;
Chiu, Y
;
Shieh, HPD
;
電控工程研究所
Microlens array fabricated by excimer laser micromachining with gray-tone photolithography
(2003-03-01)
Tien, CH
;
Chien, YE
;
Chiu, Y
;
Shieh, HPD
;
光電工程學系
We demonstrate the fabrication of a refractive microlens array by using 249nm excimer laser micromachining with coded gray-tone mask photolithography. With pre-corrections to the nonlinear exposure process, the maximum deviation from the designed shape was below 5%. The fabricated hemispherical lens of 30 mum radius was used as a solid immersion lens (SIL) and combined with a 0.54 numerical aperture (NA) objective to achieve a 0.87 effective NA through the knife-edge scanning test. The. experimental results agreed with those of the simulation. Unlike the methods such as the thermal melting process, this one-step optical exposure method with a coded mask provides a relatively fast and cost-effective way to realize a microlens array in optical data storage, information processing, and optical interconnection applications.
Multidirectional asymmetrical microlens-array light control plastic films for high performance reflective liquid crystal displays
(2002)
Shieh, HPD
;
Chiu, Y
;
Huang, YP
;
Ko, FJ
;
光電工程學系
Multidirectional asymmetrical microlens array light control films were developed to enhance image quality of reflective LCDs. Significant gain in both brightness and contrast ratio has been demonstrated without visible surface diffusion, Moire patterns and parallax.
Thermal writing by long working distance Fiberlenses for Optical Recording Applications
(2002)
Tien, CH
;
Milster, TD
;
Chiu, Y
;
Shieh, HPD
;
光電工程學系