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<專題討論>2018/3/15(四)14:10綜合大樓2樓48218教室演講 : 藍永強 教授(成功大學光電系)

張貼者:2018年3月11日 下午6:10Dabby Lu
講題:Generation of light beams by electron beam excited surface plasmons
摘要:When the electron beam moves along or normally onto the plasmonic nanostructures (PNs), it can excite the surface plasmons (SPs) on PNs along with the transition radiation (TR). In the former case, the SPs have specific frequencies determined by the intersection of dispersion curves of electron beam and SPs. In the latter case, conversely, the SPs have a wide frequency band [1]. Furthermore, SPs can be transferred into light emission (SP emission) by the surface structures of PNs. In this work, we will consider three types of light beam generation by electron beam excited SPs. First, we will investigate SP-manipulated and localized SP (LSP)-manipulated Smith-Purcell radiation (SPR) on metallic periodic gratings and disk arrays, respectively [2]. The SPR can be enhanced by exciting SPs and LSPs if their frequencies are within the emission bands of SPRs. Second, the generation of convergent beam by electron-excited SPs is examined. Here the mechanism of SPR on metallic chirped gratings is proposed to generate the convergent light beam. Finally, the SP-manipulated TR and SP emission from the electron beam normally incident PNs with designed slit structures are studied [3]. This work offers potential applications in the fields of optical imaging, holography, cryptography and tunable visible light source, etc.

[1] S. Gong, M. Hu, R. Zhong, X. Chen, P. Zhang, T. Zhao and S. Liu, “Electron beam excitation of surface plasmon polaritons,” Opt. Express 22, 19252-19261 (2014).

[2] Y. C. Lai, T. C. Kuang, B. H. Cheng, Y. C. Lan and D. P. Tsai, “Generation of convergent light beams by using surface plasmon locked Smith-Purcell radiation,” Scientific Reports 7, 11096 (2017).

[3] T. Coenen, B. J. M. Brenny, E. J. Vesseur and A. Polman, “Cathodoluminescence microscopy: Optical imaging and spectroscopy with deep-subwavelength resolution,” MRS Bulletin 40(4), 359-365 (2015).

Ċ
Dabby Lu,
2018年3月11日 下午11:59
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