• Title/Summary/Keyword: nano-photonic

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Nano imprinting lithography fabrication for photonic crystal waveguides (나노 임프린트 공정에 의한 광자결정 도파로 제조공정)

  • Jung Une-Teak;Kim Chang-Soek;Jeong Myung-Yung
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.498-501
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    • 2005
  • 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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Quantum Dot Based Mode-Locked Diode Lasers and Coherent Buried Heterostructure Photonic Crystal Nano Lasers

  • Kim, Ji-Myeong;Delfyett, Peter;Notomi, Masaya
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.02a
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    • pp.122-122
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    • 2013
  • In this talk, some optical properties of quantum dot based mode-locked diode lasers and photonic crystal nano lasers will be discussed. Linewidth enhancement factor, chirp and interband injection locking technique of quantum dot mode-locked lasers will be presented. Also various types of photonic crystal buried heterostructure lasers toward coherent nano laser will be covered as well.

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Fabrication of Nano-photonic Crystals with Lattice Constant of 460-nm by Inductively-coupled Plasma Etching Process (유도결합형 플라즈마 식각공정을 통해 제작된 460 nm 격자를 갖는 나노 광결정 특성)

  • Choi, Jae-Ho;Kim, Keun-Joo
    • Journal of the Semiconductor & Display Technology
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    • v.5 no.2 s.15
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    • pp.1-5
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    • 2006
  • The GaN thin film on the 8 periods InGaN/GaN multi-quantum well structure was grown on the sapphire substrate using metal-organic chemical vapor deposition. The nano-scaled triangular-lattice holes with the diameter of 150 nm were patterned on a polymethylmethacrylate blocking film using an electron beam nano-lithography system. The thin slab and two-dimensional photonic crystals with the thickness of 28 nm were fabricated on the GaN layer for the blue light diffraction sources. The photonic crystal with the lattice parameter of 460 nm enhances spectral intensity of photoluminescence indicating that the photonic crystals provides the source of nano-diffraction for the blue light of the 450-nm wavelength.

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Nano stamp fabrication for photonic crystal waveguides (나노 광소자용 나노스탬프 제조공정 연구)

  • Jeong, Myung-Yung;Jung, Une-Teak;Kim, Chang-Seok
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.12 s.177
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    • pp.16-21
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    • 2005
  • Photonic crystals, periodic structure with a high refractive index contrast modulation, have recently become very interesting platform for the manipulation of light. The existence of a photonic bandgap, a frequency range in which the propagation of light is prevented in all directions, makes photonic crystal very useful in application where the spatial localization of light is required, for example waveguide, beam splitter, and cavity. However, the fabrication of 3 dimensional photonic crystals 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 two dimensional lattice of hole. The fabrication of Si master with pillar structure using hot embossing process is investigated for two dimensional, low-index-contrast photonic crystal waveguide. From our research we show that the multiple stamp copy process proved to be feasible and useful.

Optical Characteristics of Plasmonic Nano-structure Using Polystyrene Nano-beads (폴리스티렌 나노 비드를 이용한 플라즈모닉 나노 구조체의 광학 특성)

  • Kim, Doo Gun;Jung, Byung Gue;Kim, Hong-Seung;Kim, Tae-Ryong;Kim, Seon-Hoon;Ki, Hyun-Chul;Kim, Tae-Un;Shin, Jae Cheol;Choi, Young-Wan
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.4
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    • pp.244-248
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    • 2015
  • We proposed and demonstrated the double layered metallic nano-hole structure using polystyrene beads process to enhance the sensitivity of surface plasmon resonance (SPR). The double layered SPR structures are calculated using the finite-difference time-domain (FDTD) method for the width, thickness, and period of the metallic nano-hole structures. The thickness of the metal film and the metallic nano-hole is 30 and 20 nm in the 214 nm wide nano-hole size, respectively. The double layered SPR structures are fabricated with monolayer polystyrene beads of 420 nm wide. The sensitivities of the conventional SPR sensor and the double layered SPR sensor are obtained to 42.2 and 52.1 degree/RIU, respectively.

Nano Patterning Functional Polymers Using Nano-imprint Technique

  • Gwon, Hyeon-Geun;Lee, Gyu-Tae
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.430.2-430.2
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    • 2014
  • Previous studies to enhance optical properties of opto-electronic devices involve patterning of inorganic materials. Patterning of inorganic material usually encompasses vacuum process that hinders productivity and increases cost. In this research, we successfully formed nano patterns with polymer matrix and fabricated photonic crystals. This process is anticipated to increase the performance of opto-electronic devices without any vacuum process. Moreover, nano imprint technology reduces cost and bolsters productivity.

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Highly-Dispersive Guided Modes of Two-Dimensional Photonic Crystal Waveguides

  • Kim, Guk-Hyun;Lee, Yong-Hee
    • Journal of the Optical Society of Korea
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    • v.7 no.1
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    • pp.38-41
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    • 2003
  • We present an analysis of highly-dispersive guided modes of two-dimensional photonic crystal waveguides. By the plane ave expansion method, band structures and mode profiles of two-dimensional photonic crystal waveguides are obtained. It is found that guided modes have very small group velocities and very large group velocity dispersions in the region near the f-point and in the region near the Brillouin zone edge. Especially, the group velocity dispersions are found to be millions of times larger than that of a conventional optical fiber. The contributions of the transverse resonance formed by two photonic band gap reflectors and the standing wave mode formed by periodic structures are discussed. We conclude that the highly-dispersive characteristics originate from the resonator-like aspect of the photonic crystal waveguide.

Photonic Crystal Effect of Nano-Patterned PEDOT:PSS Layer and Its Application to Absorption Enhancement of ZnPc Thin Films

  • Han, Ji-Young;Ryu, Il-Whan;Park, Da-Som;Kwon, Hye-Min;Yim, Sang-Gyu
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.02a
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    • pp.252-252
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    • 2012
  • It is widely accepted that short exciton diffusion lengths of organic semiconductors with respect to the film thickness limit the charge (hole and electron) separation before excitons recombination in organic photovoltaic (OPV) cells. Therefore the efficient absorption of incident light within the thin active organic layer is of great importance to improve the power conversion efficiency (PCE) of the cells. In this work, we fabricated 2-dimensionally (2D) nano-patterned poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOST:PSS) layers using capillary phenomenon and nano-imprinting technology at the scale of several hundred nanometers. This 2D nano-patterned PEDOT:PSS layer exerted photonic crystal effect such as redirection of light paths and variation of light intensity at specified wavelengths. It is also expected that the consequently alternated light pass lengths and intensities change the absorption properties of zinc phthalocyanine (ZnPc) thin films grown on top of the nano-patterned PEDOT:PSS layer. The influence of conductivity and thickness of the PEDOT:PSS layer on the absorption properties of ZnPc thin films were also investigated.

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Nano-master fabrication for photonic crystal waveguides (광결정 도파로용 나노 마스터 제작)

  • 최춘기;한상필;정명영
    • Journal of the Korean Vacuum Society
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    • v.12 no.4
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    • pp.288-292
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    • 2003
  • The fabrication of silicon nano-master with pillar structures using E-beam lithography and ICP etching was investigated for application of 2-dimensional polymer photonic crystal waveguides with air hole structures. Pillar structures with square, hexagon, dodecagon and circle were successfully fabricated. The diameters and structures of fabricated pillars were measured by CD-SEM and SPM-AFM. It was found that the optimal dose for complete circle pillar structures was 432 $\mu$C/$\textrm{cm}^2$.