Self-Assembly Three dimensional Perfect Absorber

• Main Authors: Yi-Hao Chen, 陳奕豪
• Other Authors: Din Ping Tsai
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/74231923602123393950

碩士 === 國立臺灣大學 === 物理學研究所 === 104 === Among all the research recently, metamaterial stands out as an extraordinary structure that is capable of modulating electromagnetic properties of light. The most easily seen fundamental unit that makes up metamaterials is the split ring resonator which has been demonstrated magnetic resonance, toroidal resonance and nonlinear control, etc. Later, the advent of vertical split ring resonators have given much more vigor to split ring resonators which have then been used on magnetically induced transparency and anomalous reflection. Although there are still a lot to be done for vertical split ring resonators, the most difficult thing should be the fabrication originating from its three dimensional nature, which often needs alignment of patterning under precise control using electron-beam or two-photon lithography, etc. But recently, the use of strain engineering has come into play. With the use of strain engineering, the two-dimensional pattern will assemble into three-dimensional structure itself and becomes vertical split ring resonators. I then use it to make a device called perfect absorber which attracts scientists on the use of solar cells or a more effective control on thermal energy, etc. It''s also shown to be a powerful sensor of high sensitivity or tunable capability. With the coupling with the molecular resonance, it can even break the detection limit of the infrared detection. With the combination of these two techniques, a self-assembly perfect absorber is demonstrated. It shows nearly perfect absorption, polarizaiton independence and high absorption even under a wide incident angle. Its curving arms into the third dimension provide an extra tunability on perfect absorbers that others are unable to show. Because of the easier control of self-assembly fabrication process it uses, it''s sure to pave another bright way toward the implementations of perfect absorbers.