Publication Date:
2016-06-14
Description:
Author(s): Martin Fruhnert, Alessio Monti, Ivan Fernandez-Corbaton, Andrea Alù, Alessandro Toscano, Filiberto Bilotti, and Carsten Rockstuhl Rendering arbitrary objects invisible is currently of great interest in photonics. While there are some optical tricks to hide macroscopic objects, such as camouflaging and mimetics, true invisibility remains out of reach. However, for sufficiently small objects one can use advanced techniques to prevent their detection at least at discrete wavelengths. The scattered light is suppressed, as envisioned using the recently developed scattering cancellation technique. At optical frequencies, metallic nanoparticles that mantle a small object do the desired job. However, tuning the operational frequency of such a mantle cloak remained a challenge. The authors here solve this problem by using silver ellipsoids instead of spheres. Depending on the axis ratio, the cloaking frequency is tunable throughout the entire visible spectrum. The cloak performance has been rigorously analyzed using the T-matrix method. It is envisioned that the optimized structure opens the door to many applications where the scattering signal will be suppressed at a predefined wavelength, e.g., to suppress the cross-talk between adjacent optical nanoantennas or the spurious signal from a tip in a near-field optical microscope. [Phys. Rev. B 93, 245127] Published Mon Jun 13, 2016
Keywords:
Electronic structure and strongly correlated systems
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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