• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.2
• /
• pp.1555-1562
• /
• 2015

Metal oxide semiconductors have been applied in several areas, such as solar cells, sensor, optical elements and displays, due to the high surface area, unique electrical and optical characteristics. Zinc oxide among the metal oxide has excellent physicochemical properties. Zinc oxide is a n-type semiconductor with a wide direct transition band gap of 3.37 eV at room temperature and large exciton binding energy of 60 meV. Cation-doped zinc oxide studies were conducted to complement the electrical and optical characteristics. In this paper, Al-doped ZnO was synthesized by hydrothermal synthesis using microwaves. ZnO was synthesized by adjusting the precursor ratio and using different dopants. The optimal ZnO synthesis conditions for crystal shape and optical properties were determined. The optical properties of aluminum doped zinc oxide were then examined by SEM, XRD, PL, UV-vis absorbance spectrum, and EDS.

• Proceedings of the Optical Society of Korea Conference
• /
• 2002.07a
• /
• pp.196-197
• /
• 2002

졸-겔법은 비정질이나 결정질의 산화물 박막을 제작하는 유용한 방법중 하나이다.(1) 또한 졸-겔법은 제작하고자 하는 특성의 시편을 비교적 쉽게 구현할 수 있다는 장점이 있다. TiO$_2$와 SiO$_2$ 박막은 비교적 큰 굴절률 차이를 갖고 있어 혼합비에 따라 넓고 완만한 굴절률 분포를 가진다.(2) 이것은 박막이 원하는 광학적 특성을 가지게 하여 광학이나 촉매 분야에 응용할 수 있는 가능성이 크다는 것을 의미한다. (중략)

• Proceedings of the Optical Society of Korea Conference
• /
• 2004.07a
• /
• pp.186-187
• /
• 2004

• Proceedings of the Optical Society of Korea Conference
• /
• 2001.02a
• /
• pp.162-163
• /
• 2001

폴리머를 이용한 광통신 소자는 실리카를 재료로 사용하는 소자와는 달리 고품질의 박막을 얻는 과정이 단순하고, 소자의 제조단가를 줄일 수 있어 많은 주목을 받고 있다 광통신 소자에 응용되는 여러 폴리머 중에서도 폴리이미드는 PMMA (Poly Methyl MethAcrylate) 등 다른 고분자 물질에 비해서 매우 높은 열적 및 환경적 안정성을 가지고 있는 것으로 알려져 있다. 또한 최근에는 폴리이미드가 가지는 단점인 복굴절과 흡수를 낮추기 위하여 불소기 등을 함유한 폴리이미드가 개발되었으며, 굴절률 조정 또한 용이하게 되었다. (중략)

• Proceedings of the Optical Society of Korea Conference
• /
• 2008.02a
• /
• pp.167-168
• /
• 2008

• Proceedings of the Optical Society of Korea Conference
• /
• 2008.07a
• /
• pp.149-150
• /
• 2008

• Journal of Integrative Natural Science
• /
• v.4 no.1
• /
• pp.1-6
• /
• 2011

The properties of porous silicon, such as substrate properties, porosity, thickness, refractive index, surface area, and optical properties of porous silicon were reviewed. Some properties, such as porosity, refractive index, thickness, pore diameter, multi-structures, and optical properties, are strongly dependent on the anodization process parameters. These parameters include HF concentration, current density, anodization time, and silicon wafer type and resistivity.

• Journal of the Optical Society of Korea
• /
• v.7 no.4
• /
• pp.224-229
• /
• 2003

We report a novel optical delay line that can be implemented using only optical fiber and fiber devices without the need for any bulk-optic devices such as lens, prism, and moving mirror. The dispersive property of a chirped fiber Bragg grating (CFBG) is exploited to get the delay. The proposed delay line constitutes two identical CFBGs cascaded in the reverse order with one of them being strained. Analysis reveals that the small displacement or the strain applied on the CFBG is effectively amplified in the delay line by the ratio of the minimum resonant wavelength and the reflection bandwidth of the CFBG. The dispersion properties of the CFBG with and without the strain are analyzed in detail. The theoretical performance of the proposed delay line is also discussed. Applications of the proposed delay line are expected in the field of high-speed optical coherence tomograpy.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.30 no.5A
• /
• pp.359-369
• /
• 2005

For large capacity optical CDMA networks, we propose a shared-type encoder/decoders based on an tunable wavelength converter(TWC) and an arrayed waveguide grating (AWG) router. The proposed encoder/decoder treats codewords of wavelength/time 2-D code simultaneously using the dynamic code allocation property of the TWC and the cyclic property of the AWG router, and multiple subscribers can share the encoder/decoder in networks. Feasibility of the structure of the proposed encoder/decoder for dynamic code allocation is tested through simulations using two wavelength/time 2-D codes, which are the generalized multi-wavelength prime code(GMWPC) and the generalized multi-wavelength Reed-Solomon code(GMWRSC). Test results show that the proposed encoder/decoder can increase the channel efficiency not only by increasing the number of simultaneous users without any multiple-access interference but by using a relatively short length CDMA codes.

• Korean Journal of Optics and Photonics
• /
• v.6 no.2
• /
• pp.101-107
• /
• 1995

To investigate the diffraction property of the Bessel beam for defocus which acts CFAP (Combined Filter of Amplitude and Phase), we calculated numerically the intensity, the radius of central spot, and the optical transfer function for the number of node of the Bessel beam when an optical system has an aberration-free or a spherical aberration. The Bessel beam has larger the maximum intensity and the OTF value for an optical system with a spherical aberration than that with an aberrationfree. Particularly, the OTF value at the point of maximum intensity for $W_{40}=3\lambda$is higher for the Bessel beam than for the Clear aperture. From these results, we know that the Bessel beam has the compensating effect. The Bessel beam also has the radius of central spot having a superresolution. We will useful for the fabrication of semiconductor device and the optical recording system using these effects.ffects.