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- 주제어 : two-dimensional photonic crystal (검색결과 4 건)
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2차원 광결정 제작에 패턴 특성을 향상시키기 위한 공정 기술
김해성,신동훈,김순구,이진구,이범석,김혜원,이재은,한영수,최영호 한국전기전자재료학회 2003 전기전자재료학회논문지 Vol.16 No.6
There are now many theoretical investigations and real manufactures for numerous applications of photonic crystals (PCs) associated with photonic band gap and photonic integrated circuits. However, there are some difficulties to design and fabricate the desired pattern quality. It is not easy to satisfy accurate critical dimension (CD) for patterns with arbitrary shapes and pitch sizes aligned in various directions. In this work, we report the optimum conditions to better fabricate and design, and greatly improve pattern quality in delineating two-dimensional (2D) PCs in the nanometer range using single- step e-beam lithography system with conventional exposure mode.
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박인규,김선만,이건준,이영백,김지혜 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.51
In this research, the photonic band structures and the transmittance spectra are obtained by solving Maxwell equations using the finite-difference time-domain method. Two-dimensional (2D) square-lattice photonic crystals (PCs) were designed such that the center wavelength of photonic bandgap (PBG) could be located near 800 nm. %The optimized 2D square-lattice PC has ε<sub>H</sub> = 7.0, ε<sub>L</sub> = 1.0, the lattice constant = 287 nm, and the radius of lattice (r<sub>H</sub>) = 0.3 a.%. The square-lattice PC shows a complete PBG between 711 and 841 nm. The proposed square-lattice PC can be created by the interference of four umbrella beams.For the interference of four umbrella beams with a wavelength of 400 nm and the crossing angle of 47.3˚, the interference pattern has square lattice-like profile with the lattice constant of 272 nm. %As applications of 2D square-lattice PCs, we investigated the optical properties of the linear waveguide, the 90˚-bent waveguide, and the interferometer formed by introducing proper defects to 2D square-lattice PCs. %Similarly with 2D square-lattice PCs by four beam interference, 2D triangular lattice PCs can be created by three beam interference. 2D Triangular lattice PC with the lattice constant of 287 nm can be created by the interference of three umbrella beams with a wavelength of 400 nm and the crossing angle of 68˚. The corresponding 2D triangular lattice PC shows a complete PBG between 706 nm and 916 nm.
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Oh, Yunjung,Yang, Wooseok,Kim, Jimin,Jeong, Sunho,Moon, Jooho American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.16
<P>Efficient sunlight-driven water-splitting devices can be achieved by using an optically and energetically well-matched pair of photoelectrodes in a tandem configuration. The key for maximizing the photoelectrochemical efficiency is the use of a highly transparent front photoelectrode with a band gap below 2.0 eV. Herein, we propose two-dimensional (2D) photonic crystal (PC) structures consisting of a CuFeO2-decorated microsphere monolayer, which serve as self-light-harvesting architectures allowing for amplified light absorption and high transparency. The photocurrent densities are evaluated for three CuFeO2 2D PC-based photoelectrodes with microspheres of different sizes. The optical analysis confirmed the presence of a photonic stop band that generates slow light and at the same time amplifies the absorption of light. The 410 nm sized CuFeO2 decorated microsphere 21) PC photocathode shows an exceptionally high visible light transmittance of 76.4% and a relatively high photocurrent of 0.2 mA cm(-2) at 0.6 V vs a reversible hydrogen electrode. The effect of the microsphere size on the carrier collection efficiency was analyzed by in situ conductive atomic force microscopy observation under illumination. Our novel synthetic method to produce self-light-harvesting nanostructures provides a promising approach for the solar energy by highly transparent photocathodes. effective use of solar energy by highly transparent photocathodes.</P>
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정은택(Une Teak Jung),김창석(Chang Soek Kim),정명영(Myung Yung Jeong) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Photonic crystals, periodic structure with a high refractive index contrast modulation, have recently become very interesting platform for manipulation of light. The existence of a photonic bandgap, a frequency range in which propagation of light is prevented in all direction, makes photonic crystal very useful in application where spatial localization of light is required for waveguide, beam splitter, and cavity. But fabrication of 3 dimensional photonic crystal is still difficult process. a concept that has recently attracted a lot of attention is a planar photonic crystal based on a dielectric membrane, suspended in the air, and perforated with 2 dimensional lattice of hole. We show that the polymer slabs suspended in air with triangular lattice of air hole can exhibit the in-plane photonic bandgap for TE-like modes. The fabrication of Si master with pillar structure using hot embossing process was investigated for 2 dimensional low-index-contrast photonic crystal waveguide.
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