Microfabricated artificial ommatidia using a coherent UV light based self-writing process = 자외선 가간섭 광원 기반 자기쓰임 방식을 이용한 곤충눈의 미세광학구조 모사

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A compound eye in nature consists of thousands of individual integrated photoreception units called ommatidia which are spherically arranged along a curvilinear surface and aim at slightly different directions. Individual ommatidium gathers light within a small acceptance angle then ommatidia make a full mosaic image with a wide field of view. To mimic its remarkable advantage with respect to imaging optics, an artificially microfabricated compound eye lens, compatible to a natural compound eye was demonstrated by K. Jeong et al in 2006. It is composed of about 8,400 artificial ommatidium as a single integrated optic unit with spherical arrangement. Each consists of a self-aligned microlens and waveguide by virtue of a light induced self-writing process in a photosensitive polymer resin. From the engineering point of view, the increase of the waveguide length is an indispensible prerequisite for obtaining high resolution images through an artificial compound eye for wide field-of-view imaging and fast motion detection but in the previous work, the length of waveguide is limited to 150~300μm, which is not enough to realize high resolution imaging. In this work, a coherent light based self-writing process was implemented to increase a waveguide length and demonstrated to be an efficient way of increasing the waveguide length over 500μm in an artificial ommatidium. Theoretical backgrounds for increasing waveguide length when using a coherent light, i.e. laser as a light source for a self-writing were studied with respect to the coherence of light source compared with a broadband bulb light. A microelns-assisted self-writing process with a UV sensitive polymer (SU-8) model was studied with the numerical analysis based on beam propagation method. F-number effects of microlens and dose effects for self-writing were analyzed. Microfabricated artificial ommatidia were developed with photosensitive polymer based microlnes arrays and a coherent light based self-w...
Advisors
Jeong, Ki-Hunresearcher정기훈researcher
Description
한국과학기술원 : 바이오및뇌공학과,
Publisher
한국과학기술원
Issue Date
2009
Identifier
308642/325007  / 020073536
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 바이오및뇌공학과, 2009.2, [ vii, 62 p. ]

Keywords

Biomimetics; Micro-optics; Lasers; Self-action effects; Polymers; 생체모방학; 미세광학; 레이저; 비선형 광학효과; 폴리머; Biomimetics; Micro-optics; Lasers; Self-action effects; Polymers; 생체모방학; 미세광학; 레이저; 비선형 광학효과; 폴리머

URI
http://hdl.handle.net/10203/27172
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=308642&flag=dissertation
Appears in Collection
BiS-Theses_Master(석사논문)
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