WASHINGTON, April 19–Invisibility cloaks are seemingly futuristic devices capable of concealing very small objects by bending and channeling light around them. Until now, however, cloaking techniques ...
H z component diagram when the point source is placed at r = R1 (a) in vacuum and (b) α-MoO3 invisibility concentrator and r = R2 in (c) vacuum and (d) α-MoO3 invisibility concentrator, respectively. ...
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