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碩士 === 國立中央大學 === 照明與顯示科技研究所 === 105 === Classical optics is restricted by the diffraction limit, so the resolution can’t distinguish the fine details of scale less than half of the wavelength. Since microscopy plays an important role in the biological and medical research fields, many people tried...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2017
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| Online Access: | http://ndltd.ncl.edu.tw/handle/h53g66 |
| Summary: | 碩士 === 國立中央大學 === 照明與顯示科技研究所 === 105 === Classical optics is restricted by the diffraction limit, so the resolution can’t distinguish the fine details of scale less than half of the wavelength. Since microscopy plays an important role in the biological and medical research fields, many people tried to find ways to overcome the restrictions of diffraction limit. Hyperlens is the main structure designed for breaking these restrictions.
According to the conception of Effective Medium Theory, when the wavelength is much larger than the size of the structure, structure consists of two different materials aligned periodically behaves like an anisotropic-homogeneous medium. Hyperlens is designed with this concept. Hyperlens consists of alternating concentric layers of media which have opposite sign of permittivity along the radial and azimuth direction. This structure as a lens can overcome the diffraction limit and imaging at the far field zone.
In this thesis we study the optical properties of hyperlens numerically. All the simulations are implemented with the COMSOL Multiphysics software. We study the influences of various parameters on the resolution of images. We also explored the possibility of using this structure as an optical cavity if the condition for far-field subwavelength imaging cannot be satisfied.
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