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Plasmon nanofocusing in a dielectric hemisphere covered in tapered metal film.
Mason, Daniel R,Gramotnev, Dmitri K,Kim, Kwang S Optical Society of America 2012 Optics express Vol.20 No.12
<P>We propose and analyze a new type of mechanically robust optical nanofocusing probe with minimized external environmental interference. The probe consists of a dielectric optical fiber terminated by a dielectric hemisphere - both covered in thin gold film whose thickness is reduced (tapered) along the surface of the hemisphere toward its tip. Thus the proposed probe combines the advantages of the diffraction-limited focusing due to annular propagation of the plasmon with its nanofocusing by a tapered metal wedge (i.e. a metal film with reducing local thickness). The numerical finite-element analysis demonstrates strongly subwavelength resolution of the described structure with the achievable size of the focal spot of ~20 nm with up to ~150 times enhancement of the local electric field intensity. Detailed physical interpretations of the obtained results are presented and possible application as a new type of SNOM probe for subwavelength imaging, spectroscopy and sensing are also discussed.</P>
Enhanced resolution beyond the Abbe diffraction limit with wavelength-scale solid immersion lenses.
Mason, Daniel R,Jouravlev, Mikhail V,Kim, Kwang S Optical Society of America 2010 Optics letters Vol.35 No.12
<P>The solid immersion lens (SIL) is a well-developed near-field optical device for imaging and data storage. Recent experiments have demonstrated high-quality imaging beyond the diffraction limit by nanoscale lenses in an SIL-type implementation [Nature 460, 498 (2009)]; we call these nSIL. A question arises as to what resolution is obtainable with an nSIL. From full three-dimensional, finite-difference time-domain calculations, we demonstrate that the FWHM of the focal spot of an objective-lens-nSIL system can be reduced by greater than 25% compared to a regular macroscopic SIL.</P>
Wavelength-dependent transmission through sharp 90° bends in sub-wavelength metallic slot waveguides
Mason, Daniel R.,Gramotnev, Dmitri. K.,Kim, Kwang S. The Optical Society 2010 Optics express Vol.18 No.15
<P>In this paper, we present a comprehensive numerical study of the wavelength-dependence of transmission through sharp 90 degrees bends in metallic slot waveguides with sub-wavelength localization and varying geometrical parameters. In particular, it is demonstrated that increasing the plasmon wavelength results in a significant increase (up to nearly 100%) of transmission through the bend, combined with a reduction in the mode asymmetry in the second arm of the bend. The mode asymmetry and its relaxation are explained by interference of the transmitted mode with non-propagating and leaky modes generated at the bend. Comparison with the two-dimensional case of a metal-dielectric-metal waveguide is also conducted, showing significant differences for the slot waveguides based on the presence of different non-propagating and leaky modes.</P>
Stadium Games in Entrepreneurial Cities in China: A State Project
Hanhan Xue,Daniel S. Mason 글로벌지식마케팅경영학회 2019 Journal of Global Sport Management Vol.4 No.2
Cities in China have started to build sport-related infrastructure in earnest; over 1.6 million sport facilities (including 1,093 large-scale sport stadiums and arenas) were built in China from 2003 to 2013. However, operating losses have created concerns of a debt crisis, sparking debate as to whether stadium and arena development can improve the quality of life of residents. This paper examines China’s arena development strategy over the past decade, and finds that development has been undertaken by local governments for two purposes: (1) local development and growth to increase urban competitiveness; and (2) establishing “human-centered” infrastructure to symbolically position the city to gain the state’s sustained support in competition for resources with other cities. Thus, cities do not invest public funds principally in the name of increased tourism, commercial development, or even civic pride but rather as a means for the city to be elevated in the eyes of the central government.
Min, Seung Kyu,Cho, Yeonchoo,Mason, Daniel R.,Lee, Ju Young,Kim, Kwang S. American Chemical Society 2011 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.115 No.33
<P>We briefly discuss theoretical studies of the optical properties of self-assembled nanolenses, spintronics of carbon-based materials, and molecular electronics for fast DNA sequencing. We address the super-resolution phenomena of nanolenses, the supermagnetoresistance phenomena of graphene nanoribbon spin valves, and ultrafast DNA sequencing based on the 2-dimensional conductance of a graphene nanoribbon on a nanochannel.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2011/jpccck.2011.115.issue-33/jp203748r/production/images/medium/jp-2011-03748r_0008.gif'></P>