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Omnidirectional Conformal Cloak Without Geometrical Dispersion
Taiyuan Univ Technol, Coll Phys & Optoelect, Key Lab Adv Transducers & Intelligent Control Sys, Minist Educ & Shanxi Prov, Taiyuan 030024, Shanxi, Peoples R China..
Taiyuan Univ Technol, Coll Phys & Optoelect, Key Lab Adv Transducers & Intelligent Control Sys, Minist Educ & Shanxi Prov, Taiyuan 030024, Shanxi, Peoples R China..
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electromagnetic Engineering. State Key Laboratory of Modern Optical Instrumentations, Centre for Optical and Electromagnetic Research, JORCEP, Zhejiang University, Hangzhou, 310058, China.ORCID iD: 0000-0002-3401-1125
2019 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 12, no 6, article id 064009Article in journal (Refereed) Published
Abstract [en]

The phase delay problem of invisibility cloaks designed by optical conformal mapping is referred to the optical path difference between the waves in upper and lower Riemann sheets. As the frequency changes, the phase delay varies accordingly (here, we call it geometrical dispersion), which restricts the cloaks to working only at some discrete frequencies. Here, we solve the phase-delay problem by placing an optically null medium in the lower Riemann sheet. The conformal cloaks designed by using our method have many advantages, such as a continuous working band (no geometrical dispersion), omnidirectionality, robustness under frequency shifts, and no need for any complex materials that are both anisotropic and inhomogeneous. We also design metallic microchannels to realize our cloaks.

Place, publisher, year, edition, pages
American Physical Society, 2019. Vol. 12, no 6, article id 064009
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-266234DOI: 10.1103/PhysRevApplied.12.064009ISI: 000501516600004Scopus ID: 2-s2.0-85077186488OAI: oai:DiVA.org:kth-266234DiVA, id: diva2:1382938
Note

QC 20200107

Available from: 2020-01-07 Created: 2020-01-07 Last updated: 2020-01-07Bibliographically approved

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