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The Far-Field Superlens
Published in Zhaowei Liu, Plasmonics and Super-Resolution Imaging, 2017
where λ0 is the free-space wavelength and NA = n ⋅ sin (θ) is the numerical aperture of the system, with θ representing the maximum collection angle of the microscope objective. For visible wavelengths in free space, this limits imaging resolution to a few hundred nanometers. No information from finer features beyond the spatial frequency detection bandwidth will be collected. One solution to improve the absolute resolution of a microscope is to use shorter wavelengths for illumination, but in many cases these higher-energy waves can damage the object one wishes to examine. The question then, for a myriad of applications such as biological imaging, lithography, and optical data storage, is as follows: How can we bypass the diffraction limit and achieve super-resolution? In recent years, a number of methods for far-field super-resolution imaging have been proposed and demonstrated [2–6], such as the FSL, the hyperlens, superoscillation, and fluorescence-assisted probing. Compared to other far-field super-resolution imaging techniques, the FSL is desirable due to its wide field of view and its potential for real-time imaging capability.
Light, the universe and everything – 12 Herculean tasks for quantum cowboys and black diamond skiers
Published in Journal of Modern Optics, 2018
Girish Agarwal, Roland E. Allen, Iva Bezděková, Robert W. Boyd, Goong Chen, Ronald Hanson, Dean L. Hawthorne, Philip Hemmer, Moochan B. Kim, Olga Kocharovskaya, David M. Lee, Sebastian K. Lidström, Suzy Lidström, Harald Losert, Helmut Maier, John W. Neuberger, Miles J. Padgett, Mark Raizen, Surjeet Rajendran, Ernst Rasel, Wolfgang P. Schleich, Marlan O. Scully, Gavriil Shchedrin, Gennady Shvets, Alexei V. Sokolov, Anatoly Svidzinsky, Ronald L. Walsworth, Rainer Weiss, Frank Wilczek, Alan E. Willner, Eli Yablonovitch, Nikolay Zheludev
N. I. Zheludev discusses the prospects for super-resolution imaging technology based on superoscillation, a phenomenon first described by Berry and Popescu, and inspired by an earlier analysis of Aharonov et al., which allows optical waves to form arbitrarily small spatial energy localizations that propagate far from a source. The author’s group has demonstrated resolution up to one sixth of the wavelength, with the technique recently applied in biological imaging.