English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Is it possible to actually make Harry's invisibility cloaks? The mostpromising approach for realizing such magical cloaking in our real world wouldbe to use transformation optics, where an empty space with a distorted geometryis imitated with a non-distorted space but filled with transformation mediumhaving appropriate permittivity and permeability. An important requirement fortrue invisibility cloaks is nonreciprocity; that is, a person in the cloakshould not be seen from the outside but should be able to see the outside. Thisinvisibility cloak, or a nonreciprocal shield, cannot be created as far as westay in conventional transformation optics. Conventional transformation opticsis based on Riemann geometry with a metric tensor independent of direction, andtherefore cannot be used to design the nonreciprocal shield. To overcome thisproblem, we propose an improved theory of transformation optics that is basedon Finsler geometry, an extended version of Riemann geometry. Our theory showsthat nonreciprocal shielding can be realized by covering cloaking space withtransformation medium having anisotropic, nonreciprocal permittivity andpermeability. This theory includes conventional transformation optics asspecial cases. We show the method for designing the spatial distribution of thepermittivity and permeability required to make the nonreciprocal shield.

Asymmetric Cloaking Theory Based on Finsler Geometry ~ How to design Harry Potter's invisibility cloak with a scientific method ~