报告人：Professor Shangjr (Felix) Gwo（果尚志） 国立中央研究院、国立清华大学

报告题目：Aluminum Plasmonics as an Optimal Platform for SERS

报告时间：2019年11月6日下午16:00

报告地点：909 B厅

报告摘要：

For the practical applications of plasmonic devices and metasurface-based optical structures, it is desirable to develop alternative, high-performance plasmonic materials, in replacement of commonly used noble metals such as gold (Au) and silver (Ag). Ideally, plasmonic materials should have the properties of low loss, sustainability, stability, biocompatibility, tunability, as well as integrability with present semiconductor technologies. Recently, we have developed epitaxial growth techniques for forming atomically smooth, single-crystalline aluminum (Al) and titanium nitride films on sapphire and silicon substrates using molecular-beam epitaxy (MBE). In comparison to Ag, Al-based plasmonic structures are chemically stable and exhibit an excellent spectral response in the ultraviolet (UV) region, making Al-based SERS substrates particular suitable for UV surface-enhanced surface Raman spectroscopy (UV-SERS) and plasmonic metasurface-based linear and nonlinear optics. In this talk, I will present recent experimental results of Al-SERS substrates. In comparison to Ag counterparts using the same top-down nanofabricated SERS substrate design and two-dimensional (atomically thin monolayer) semiconductor analyte, Al-SERS outperforms Ag-SERS in the UV (325 nm) region and shows a surprising strong (comparable or even better than Ag) SERS signal in the visible (532 nm) region, resulting from the excellent properties of native alumina layer formed on the Al substrate.

References

[1]H.-Y. Chen, M.-H. Lin, C.-Y. Wang, Y.-M. Chang, S. Gwo, “Large-scale hot spot engineering for quantitative SERS at the single-molecule scale,” J. Am. Chem. Soc. 2015, 137, 13698–13705.

[2]C.-Y. Wang, H.-Y. Chen, L. Sun, W.-L. Chen, Y.-M. Chang, H. Ahn, X. Li, S. Gwo, “Giant colloidal silver crystals for low-loss linear and nonlinear plasmonics,” Nature Commun. 2015, 6, 7734.

[3]S. Gwo, H.-Y. Chen, M.-H. Lin, L. Sun, X. Li, “Nanomanipulation and controlled self-assembly of metal nanoparticles and nanocrystals for plasmonics,” Chem. Soc. Rev. 2016, 45, 5672–5716.

[4]F. Cheng, P.-H. Su, J. Choi, S. Gwo, X. Li, C.-K. Shih, “Epitaxial Growth of atomically smooth aluminum on silicon and its intrinsic optical properties,” ACS Nano 2016, 10, 9852–9860.

[5]C.-W. Cheng, Y.-J. Liao, C.-Y. Liu, B.-H. Wu, S. S. Raja, C.-Y. Wang, X. Li, C.-K. Shih, L.-J. Chen, S. Gwo, “Epitaxial aluminum-on-sapphire films as a plasmonic material platform for ultraviolet and full visible spectral regions,”ACS Photonics 2018, 5, 2624–2630.

[6]W.-P. Guo, R. Mishra, C.-W. Cheng, B.-H. Wu, L.-J. Chen, M.-T. Lin, S. Gwo, “Titanium nitride epitaxial films as a plasmonic material platform: Alternative to gold,”ACS Photonics 2019, 6, 1848–1854.

个人简介 ：

Professor Shangjr (Felix) Gwo

Research Center for Applied Sciences, Academia Sinica, Nankang, Taipei, Taiwan

Education:

1987-1993Ph.D. in Physics

The University of Texas at Austin, Texas, U.S.A.

1981-1985B.S. in Electronic Engineering

National Chiao-Tung University, Hsinchu, Taiwan

Current Positions:

02/2019–PresentDistinguished Research Fellow and Director, Research Center for Applied Sciences, Academia Sinica, Nankang, Taipei, Taiwan

08/2010–PresentChair Professor, Department of Physics

National Tsing-Hua University, Hsinchu, Taiwan

03/2018–PresentChair Professor, School of Science

National Chiao-Tung University, Hsinchu, Taiwan

Representative Honors:

Fellow of the American Physical Society (APS), Fellow of the Physical Society of Republic of China (Taiwan)

Research Interests:

Nanomaterial and Nanostructure Physics, Nanophotonics and Plasmonics, Nitride Materials for Optoelectronic and Electronic Applications

Representative Publications:

1.S. Gwo, H.-Y. Chen, M.-H. Lin, L. Sun, and X. Li, Nanomanipulation and controlled self-assembly of metal nanoparticles and nanocrystals for plasmonics,” Chem. Soc. Rev. 45, 5672–5716 (2016).

2.S. Gwo and C.-K. Shih, Semiconductor plasmonic nanolasers: Current status and perspectives,” Rep. Prog. Phys. 79, 086501 (2016).

3.Y.-J. Lu, J. Kim, H.-Y. Chen, C. Wu, N. Dabidian, C. E. Sanders, C.-Y. Wang, M.-Y. Lu, B.-H. Li, X. Qiu, W.-H. Chang, L.-J. Chen, G. Shvets, C.-K. Shih, and S. Gwo, Plasmonic nanolaser using epitaxially grown silver film, Science 337, 450–453 (2012).

联系人：江林 教授