000223075 001__ 223075
000223075 005__ 20181203024436.0
000223075 0247_ $$2doi$$a10.1103/PhysRevApplied.4.014005
000223075 022__ $$a2331-7019
000223075 037__ $$aARTICLE
000223075 245__ $$aUnidirectional Cloaking Based on Metasurfaces with Balanced Loss and Gain
000223075 260__ $$c2015
000223075 269__ $$a2015
000223075 336__ $$aJournal Articles
000223075 520__ $$aWe prove that balanced loss-gain distributions provide an elegant path towards realizing loss-free unidirectional cloaks for objects much larger than the wavelength. By coating a scatterer with an ultrathin metasurface with balanced loss and gain, such as a parity-time (PT)-symmetric metasurface in the special case of a symmetric scatterer, we show that it is possible to ideally cloak the scatterer from a particular direction. The passive portion of the cloak ensures that the incident power on the illuminated side of the object is fully absorbed, while the active portion radiates the required pattern on the opposite side, automatically synchronized with the impinging signal, eliminating shadows and making the object invisible. The proposed approach substitutes complex metamaterial cloaks and achieves cloaking with relaxed limitations on size, and in an ultrathin, loss-free, and stable design. Beyond introducing a new venue to cloaking of large objects, our paper shows the unique potential for scattering manipulation introduced by structures with balanced loss and gain, pointing to a new direction in the field of PT-symmetric systems.
000223075 700__ $$aSounas, Dimitrios L.
000223075 700__ $$0249696$$aFleury, Romain$$g201483
000223075 700__ $$aAlù, Andrea
000223075 773__ $$j4$$k1$$tPhysical Review Applied
000223075 909C0 $$0252597$$pLWE$$pUPFLEURY
000223075 909CO $$ooai:infoscience.tind.io:223075$$pSTI$$particle
000223075 917Z8 $$x144315
000223075 937__ $$aEPFL-ARTICLE-223075
000223075 973__ $$aOTHER$$rREVIEWED$$sPUBLISHED
000223075 980__ $$aARTICLE