Topic
Transformation optics
About: Transformation optics is a research topic. Over the lifetime, 2687 publications have been published within this topic receiving 102378 citations.
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TL;DR: In this paper, a planar distributed full-tensor anisotropic metamaterials for cloaks of invisibility based on transformation electromagnetics are proposed and implemented in microstrip line technology and its performance is demonstrated experimentally at microwave frequencies.
Abstract: Planar distributed full-tensor anisotropic metamaterials for cloaks of invisibility based on transformation electromagnetics are proposed. The proposed metamaterials are composed of nonresonant transmission lines and are advantageous in full control of the off-diagonal components of the permeability tensor as well as broadband and low-loss characteristics. The explicit design formulas for the metamaterials are given based on the equivalent circuit derived directly from Maxwell's equations. A carpet cloak of invisibility is designed and the validity of the design theory is confirmed by circuit simulations. In addition, the carpet cloak is implemented in microstrip line technology and its performance is demonstrated experimentally at microwave frequencies.
32 citations
TL;DR: In this article, the authors investigate numerically the electromagnetically induced transparency-like behavior in alldielectric planar photonic metamaterials, which consists of a periodical array of silicon metamolecules, each of which comprises a radiative resonator and a subradiant resonator that couple to each other through near field interactions.
Abstract: We investigate numerically the electromagnetically induced transparency-like behavior in alldielectric planar photonic metamaterials. The proposed metamaterial consists of a periodical array of silicon metamolecules. Each metamolecule comprises a radiative resonator and a subradiant resonator that couple to each other through near field interactions. Resonances with extremely high quality factors of up to several thousands are predicted, and a group refractive index of more than 200 can be realized at the transparency window. This provides an effective platform for slow light, enhanced nonlinearity and sensing applications and presents opportunities for developing new types of active lasing and optomechanical metamaterials.
32 citations
TL;DR: In this article, the generalized Luneburg lens and its transformed counterpart were applied to realize efficient coupling to plasmonic nano-waveguides for broadband light couplings under wide incident angles.
Abstract: Gradient index (GRIN) structures have attracted great interests since their invention. Especially, the recent advance in the fields of transformation optics, plasmonics, and nanofabrication techniques has opened new directions for the applications of GRIN structures in nano-photonic devices. In this paper, we apply Luneburg lens and its transformed counterpart to realize efficient coupling to plasmonic nano-waveguides. We first briefly present the general structures of Luneburg lens and generalized Luneburg lens, as well as the design process of flattened Luneburg lens applying quasi-conformal mapping techniques. After that, we study the performance of these lenses for coupling electromagnetic signals to nano-waveguides (the metal-insulator-metal nano-waveguide). Different coupling schemes are investigated. It is found that the proposed Luneburg lens based optical couplers can be used to provide broadband light couplings to plasmonic nano-waveguides under wide incident angles.
32 citations
32 citations
TL;DR: In this paper, an electrostatic field invisibility cloak has been theoretically investigated and experimentally demonstrated to perfectly hide two dimensional objects without disturbing their external electrostatic fields using both cancelling technology and transformation optics (TO).
Abstract: The invisibility cloak has been drawing much attention due to its new concept for manipulating many physical fields, from oscillating wave fields (electromagnetic, acoustic and elastic) to static magnetic fields, dc electric fields, and diffusive fields. Here, an electrostatic field invisibility cloak has been theoretically investigated and experimentally demonstrated to perfectly hide two dimensional objects without disturbing their external electrostatic fields. The desired cloaking effect has been achieved via both cancelling technology and transformation optics (TO). This study demonstrates a novel way for manipulating electrostatic fields, which shows promise for a wide range of potential applications.
32 citations