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本文设计、制备了一种基于硅基光电子技术的超紧凑混合表面等离激元光场窄化器件, 并验证了器件的纳米聚焦性能. 实验结果表明, 该光场窄化器件利用了长度约为1.23 μm的锥形渐变结构, 将硅条形波导中的光场聚焦到硅基混合表面等离激元波导中, 在1550 nm的近红外波段最高可实现约20倍的非谐振光场增强效应. 结构简单, 性能优异的硅基混合表面等离激元光场窄化器件, 在光场操控、光传感、非线性光学器件、光相变存储等领域中具有潜在的应用价值.
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关键词:
- 硅基光电子 /
- 硅基混合表面等离激元 /
- 片上纳米聚焦 /
- 大规模光电子集成
Silicon-based optoelectronics, using the mature silicon-based microelectronic complementary metal oxide semiconductor (CMOS) manufacturing process, is a large-scale optoelectronic integration platform that has attracted much attention. Surface plasmonic devices have also received extensive attention in the past decades, and especially the silicon-based surface plasmonic nanofocusing devices have become a research hotspot. Typical nanofocusing structures include chirped surface gratings, plasmonic Fresnel zone plate, nano-slit array, tapered metal tips. However, there occur some inevitable problems in these devices, such as the fine structure being too complex to be fabricated and too large transmission loss of metal slot waveguide. In this work, an ultra-compact hybrid surface plasmon nanofocusing device is designed and fabricated by the silicon-based optoelectronic technology, and the nanofocusing performance of the device is also experimentally verified. The hybrid surface plasmon nanofocusing devices are fabricated on a silicon-on-insulator (SOI) wafer by electron beam lithography (EBL) system. The silicon wire waveguides, tapers and the thin silicon strips in the middle of nanofocusing regions are patterned in only one step EBL. The gold layer is formed by a deposition and lift-off process, and then a partially etching process is introduced to make the thickness of the middle thin silicon strips the same as that of the gold layer. With a 1.23-μm-long tapered structure, our nanofocusing devices focus the light field of a silicon strip waveguide into a hybrid surface plasmon waveguide, making non-resonant optical field increase 20 times in the 1550 nm near-infrared band experimentally. The entire insertion loss is about 4.6 dB, and the mode area of the nanofocusing area is about${\left( {\lambda /n} \right)^2}/640$ which is over 300 times smaller than that of the input silicon waveguide. When the middle slot silicon waveguide width WSi = 120 nm, the insertion loss reaches a minimum value of 2.8 dB. In our design, we adopt the design of silicon-based hybrid plasmonic waveguides. In this design, a layer of material with low refractive index is inserted between the metal layer and the silicon layer to act as a “container” of light field, which makes this silicon-based hybrid plasmonic waveguides have less loss than the traditional metal plasmonic waveguides, and can still maintain high optical field localization. Such silicon-based hybrid surface plasmon nanofocusing devices with simple structures and excellent performances are promising alternatives for future applications in optical field manipulation, optical sensing, nonlinear optical devices, and optical phase-change storage.-
Keywords:
- silicon-based optoelectronics /
- silicon hybrid plasmonics /
- on-chip nanofocusing /
- large-scale optoelectronic integration
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[2] Zhou Z, Yin B, Michel J 2015 Light Sci. Appl. 4 e358Google Scholar
[3] Dai D, Bowers J E 2014 Nanophotonics 3 283Google Scholar
[4] Dai D, Bauters J, Bowers J E 2012 Light Sci. Appl. 1 e1Google Scholar
[5] Zhou Z, Bai B, Liu L 2019 IEEE J. Sel. Topics Quantum Electron 25 4600413Google Scholar
[6] Bai B, Yang F, Zhou Z 2019 Photonics Res. 7 289Google Scholar
[7] Chen R, Bai B, Yang F, Zhou Z 2020 Optics Lett. 45 803Google Scholar
[8] Chen R, Bai B, Zhou Z 2020 Photonics Res. 8 1197Google Scholar
[9] Zhu K, Xu P, Sun P, Liu X, Li H, Zhou Z 2020 An Ultra-compact Broadband TE-pass Nanofocusing Structure (Beijing: Optical Society of America)
[10] Zhu K, Xu P, Sun P, Liu X, Li H, Zhou Z 2020 Low Loss, High Extinction Ratio Plasmonic Spot Size Converter (Beijing: Optical Society of America)
[11] Sun P F, Xu P F, Zhu K J, Zhou Z P 2021 Photonics 8 482Google Scholar
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[14] Diaz F J, Hatakeyama T, Rho J, Wang Y, O Brien K, Zhang X, Martijn De Sterke C, Kuhlmey B T, Palomba S 2016 Optics Express 24 545Google Scholar
[15] Kim S, Lim Y, Kim H, Park J, Lee B 2008 Appl. Phys. Lett. 92 13103Google Scholar
[16] Fu Y, Zhou W, Lim L E N, Du C L, Luo X G 2007 Appl. Phys. Lett. 91 61124Google Scholar
[17] Mote R G, Yu S F, Ng B K, Zhou W, Lau S P 2008 Optics Express 16 9554Google Scholar
[18] Shi H, Wang C, Du C, Luo X, Dong X, Gao H 2005 Optics Express 13 6815Google Scholar
[19] Min C, Wang P, Jiao X, Deng Y, Ming H 2008 Appl. Phys. B 90 97Google Scholar
[20] Stockman M I 2004 Phys. Rev. Lett. 93 137404Google Scholar
[21] Babadjanyan A J, Margaryan N L, Nerkararyan K V 2000 J. Appl. Phys. 87 3785Google Scholar
[22] Issa N A, Guckenberger R 2007 Plasmonics 2 31Google Scholar
[23] Gramotnev D K, Vogel M W, Stockman M I 2008 J. Appl. Phys. 104 34311Google Scholar
[24] Veronis G, Fan S 2007 Optics Express 15 1211Google Scholar
[25] Chen L, Shakya J, Lipson M 2006 Optics Letters 31 2133Google Scholar
[26] Ono M, Taniyama H, Xu H, Tsunekawa M, Kuramochi E, Nozaki K, Notomi M 2016 Optica 3 999Google Scholar
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图 2 硅基混合表面等离激元光场窄化器件(WSi = 120 nm, g = 30 nm, hm = 30 nm)的光场分布图 (a) 整体俯视图; (b)—(e) 对应于x1 = 0 μm, x2 = –0.8 μm, x3 = –1.4 μm, x4 = –2 μm的截面图
Fig. 2. Optical field distribution of the silicon hybrid plasmonic nanofocusing device (g = 30 nm, WSi = 450 nm, hm = 30 nm): (a) Overall top view; (b)–(e) cross-sectional view corresponding to x1 = 0 μm, x2 = –0.8 μm, x3 = –1.4 μm, x4 = –2 μm.
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[1] Zhou Z, Yin B, Deng Q, Li X, Cui J 2015 Photonics Res. 3 B28Google Scholar
[2] Zhou Z, Yin B, Michel J 2015 Light Sci. Appl. 4 e358Google Scholar
[3] Dai D, Bowers J E 2014 Nanophotonics 3 283Google Scholar
[4] Dai D, Bauters J, Bowers J E 2012 Light Sci. Appl. 1 e1Google Scholar
[5] Zhou Z, Bai B, Liu L 2019 IEEE J. Sel. Topics Quantum Electron 25 4600413Google Scholar
[6] Bai B, Yang F, Zhou Z 2019 Photonics Res. 7 289Google Scholar
[7] Chen R, Bai B, Yang F, Zhou Z 2020 Optics Lett. 45 803Google Scholar
[8] Chen R, Bai B, Zhou Z 2020 Photonics Res. 8 1197Google Scholar
[9] Zhu K, Xu P, Sun P, Liu X, Li H, Zhou Z 2020 An Ultra-compact Broadband TE-pass Nanofocusing Structure (Beijing: Optical Society of America)
[10] Zhu K, Xu P, Sun P, Liu X, Li H, Zhou Z 2020 Low Loss, High Extinction Ratio Plasmonic Spot Size Converter (Beijing: Optical Society of America)
[11] Sun P F, Xu P F, Zhu K J, Zhou Z P 2021 Photonics 8 482Google Scholar
[12] Gramotnev D K, Bozhevolnyi S I 2014 Nat. Photonics 8 13Google Scholar
[13] Diaz F J, Li G, de Sterke C M, Kuhlmey B T, Palomba S 2016 J. Opt. Soc. Am. B 33 957Google Scholar
[14] Diaz F J, Hatakeyama T, Rho J, Wang Y, O Brien K, Zhang X, Martijn De Sterke C, Kuhlmey B T, Palomba S 2016 Optics Express 24 545Google Scholar
[15] Kim S, Lim Y, Kim H, Park J, Lee B 2008 Appl. Phys. Lett. 92 13103Google Scholar
[16] Fu Y, Zhou W, Lim L E N, Du C L, Luo X G 2007 Appl. Phys. Lett. 91 61124Google Scholar
[17] Mote R G, Yu S F, Ng B K, Zhou W, Lau S P 2008 Optics Express 16 9554Google Scholar
[18] Shi H, Wang C, Du C, Luo X, Dong X, Gao H 2005 Optics Express 13 6815Google Scholar
[19] Min C, Wang P, Jiao X, Deng Y, Ming H 2008 Appl. Phys. B 90 97Google Scholar
[20] Stockman M I 2004 Phys. Rev. Lett. 93 137404Google Scholar
[21] Babadjanyan A J, Margaryan N L, Nerkararyan K V 2000 J. Appl. Phys. 87 3785Google Scholar
[22] Issa N A, Guckenberger R 2007 Plasmonics 2 31Google Scholar
[23] Gramotnev D K, Vogel M W, Stockman M I 2008 J. Appl. Phys. 104 34311Google Scholar
[24] Veronis G, Fan S 2007 Optics Express 15 1211Google Scholar
[25] Chen L, Shakya J, Lipson M 2006 Optics Letters 31 2133Google Scholar
[26] Ono M, Taniyama H, Xu H, Tsunekawa M, Kuramochi E, Nozaki K, Notomi M 2016 Optica 3 999Google Scholar
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