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| 研究生： |
楊仁宏 Yang, Ren-hong |
|---|---|
| 論文名稱： |
單表面電漿子之產生及調控 Generation and modulation of single surface plasmon |
| 指導教授： |
褚志崧
CHUU, CHIH-SUNG |
| 口試委員: |
王立邦
WANG, LI-BANG 劉怡維 LIU, I-WEI |
| 學位類別： |
碩士 Master |
| 系所名稱： |
理學院 - 物理學系 Department of Physics |
| 論文出版年： | 2017 |
| 畢業學年度： | 105 |
| 語文別： | 中文 |
| 論文頁數： | 101 |
| 中文關鍵詞： | 表面電漿 、調製表面電漿 、單光子 |
| 外文關鍵詞： | surfaceplasmon, singlesurfaceplasmon, singlephoton |
| 相關次數： | 點閱：3 下載：0 |
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本實驗主要是利用自發性參數下轉換的過程產生795nm單光子源，其波包半高寬大約是30ns，再將其通過金屬的孔洞陣列，在這樣的金屬表面結構會誘發異常光學穿透現象。
我們製作的金屬孔洞陣列孔洞大小為200nm，週期排列間距為430nm，整個孔洞陣列的邊長為25μm。如果只考慮光學現象的繞射穿透，在這樣結構下發生光學穿透機率大約為1.5%，可是實際這樣的金屬陣列會產生表面電漿共振，使光學穿透率提高至大約40%。
另外，我們也試著討論將產生的單光子先經過電光調變器後，再使其通過金屬孔洞陣列的情形。本篇論文中，藉由電光調變器將單光子波包消去一半，並使其穿透金屬孔洞陣列後，我們量測此單光子的純度，並在實驗上證實它依然保持的單光子的特性。
本實驗經由討論古典光上的異常穿透行為，進而延伸到量子領域，在實驗上證實在量子領域上異常光學穿透也是符合，且也能夠持續保持單光子純度的特性。
In this thesis, we let 397.5nm laser to undergoes spontaneous parametric down-conversion to produce 795nm single photon whose full width at half maximum is about 30ns. After the generation, we make the single photon pass through the hole arrays which are on a metal(Au) surface. With this kind of surface, extraordinary optical transmission could be seen, and the transmission rate of the single photon will be increased.
The sample used in our setup is a metal square with 25μm on each side. Arrays formed by holes whose size is 200nm are periodically spread on this metal square, and the interval between two holes is about 430nm. If we consider the effect of diffraction only, the transmission rate will be about 1.5%. However, the sample provided here can increase the optical transmittance to about 40% because of the induced surface plasmon resonance on the surface.
Beside, we use electro-optical modulator to modulate the single photon wave-package before it bumping into the metal surface. The experimental result shows that the photon transmitting the metal surface will maintain its purity.
We discuss the extraordinary transmission behavior with classical light and then extend the case to the quantum region. The experimental results proved that the extraordinary optical transmission is consistent with the quantum field and will keep the single photon purity.
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[2] https://zh.wikipedia.org/wiki/%E8%A1%8D%E5%B0%84
[3] T. W. Ebbesen,” Extraordinary optical transmission through sub-wavelength hole arrays”, NATURE,1998.
[4] T.W. Ebbesen et al,”Theory of Extraordinary Optical Transmission through Subwavelength Hole Arrays”,PhysRevLett.86.1114
[5] H. A. BETHE,”Theory of Diffraction by Small Holes”,1944.
[6] Jason Bowie, Jack Boyce, and Raymond Chiao, “Saturated-absorption spectroscopy of weak-field Zeeman splittings in rubidium”, Vol. 12, No. 10
[7]清華大學光電實驗課-飽和吸收光譜講義。