An Ultra-Compact ultra broadband Carbon Nanotube Absorber Using Electrophoretic Deposition

• Main Authors: Chien, Ding-Rung, 簡鼎融
• Other Authors: Lin, Shih-Chun
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/s586qz

碩士 === 國立交通大學 === 電子研究所 === 105 === In recent years, carbon nanotubes (CNTs) are used on perfect absorbers due to their optical property of close-to-air refractive index. However, because of porous materials and low extinction coefficients, CNTs requires a quite thick absorption layer (around 100 μm) to reach near perfect absorption. The large thickness of CNTs prohibits them from cost reduction and from realizing miniaturized integrated photonics. In this thesis, we use the characteristics of CNTs prepared by electrophoretic deposition (EPD) with resonant cavity structure to achieve perfect absorption. The experiment result reveals that an averaged absorption of 0.95 can be achieved over a broad spectral range from 0.3 μm to 4.81 μm. It is worth noting that, under the condition of maintaining the high absorption not only the total device thickness is reduced, but also the entire deposition process is done at low temperature (<120℃). We believe that this proposal is very promising for nano-photonic applications in terms of bandwidth, compactness, and the cost.