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The Study of Nano-optical Antenna Array Structure for Nano-device

Title
The Study of Nano-optical Antenna Array Structure for Nano-device
Translated Title
나노디바이스를 위한 나노광학 안테나 배열 구조
Authors
Im, Jae Han
DGIST Authors
Im, Jae Han; Jang, Jae Eun; Choi, Hong Soo
Advisor(s)
Jang, Jae Eun
Co-Advisor(s)
Choi, Hong Soo
Issue Date
2013
Available Date
2016-05-18
Degree Date
2013. 2
Type
Thesis
Keywords
Nano-antennaoptical antennaNano structureCNT growth탄소나노튜브 성장나노 안테나광학안테나나노구조체
Abstract
Nano antenna, coupling between terahertz level electro-magnetic wave and electri-cal signal, has been researched as an interest topic for terahertz communication and optoe-lectronics. In traditional antenna theory, the antenna length has strong relationship with wavelength. Especially, the formula that is a function of antenna size, wavelength, light velocity and frequency can be partly applied to terahertz communication. Therefore, multi-antenna structure with different length from micrometer to nanometer can have various resonant frequencies in ultra-high frequency region. However, the high resistance of metal nanostructure and the complicated fabrication process using ‘Top-down’ approach induce severe problems to the application in THz area. The purpose of this work is to grow Carbon nanotubes (CNTs) which have different lengths at specific points. To grow single multi-walled CNT (MWCNT) on selected po-sition, the patterned Ni catalyst and plasma enhanced chemical vapor deposition (PECVD) growth process were used. We investigated various CNT length formations with the con-trol of catalyst size, acetylene ratio and temperature. For the experiment of catalyst size control, single CNT has grown on the catalyst which size is below 300nm. Although low temperature growth appears lower growth rate, it shows higher yield ratio of single CNT growth. CNT length is proportional to catalyst size. CNT thickness and length are longer and thicker with increasing C2H2 gas ratio respectively. From optimized process condi-tions, we get single MWCNTs with various heights on selected points using one step CVD process. The expected resonance frequency is from 50 to 130 THz as monopole antenna concept. ⓒ 2013 DGIST
Table Of Contents
Ⅰ. INTRODUCTION 1 -- 1.1 Background 1 -- 1.2 Nano-optical carbon nanotube Antenna 4 -- 1.3 Carbon nanotube 8 -- Ⅱ. Experiment 11 -- 2.1 Catalyst pattern 11 -- 2.2 Carbon nanotube growth 16 -- Ⅲ. Result 18 -- 3.1 Nano patterned Ni catalyst using E-beam lithography 18 -- 3.2 CNT growth parameters 23 -- 3.2.1 Catalyst thickness 23 -- 3.2.2 Effect of plasma state 24 -- 3.2.3 Process gas effect 27 -- 3.2.4 Temperature effect 28 -- 3.3 Single CNT growth 29 -- 3.4 The Height of CNT 33 -- 3.5 Multi height CNT array 38 -- 3.6 Si_SiO2_Ni CNT growth 39 -- Ⅳ. Conclusion 43
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002262487
http://hdl.handle.net/20.500.11750/1332
DOI
10.22677/thesis.2262487
Degree
Master
Department
Information and Communication Engineering
University
DGIST
Files:
Collection:
Information and Communication EngineeringThesesMaster


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