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Subwavelength focusing by optical surface transformation
Zhejiang Univ, Ctr Opt & Electromagnet Res, State Key Lab Modern Opt Instrumentat, JORCEP, Hangzhou 310058, Zhejiang, Peoples R China.;Zhejiang Univ, Natl Engn Res Ctr Opt Instrumentat, Hangzhou 310058, Zhejiang, Peoples R China.;Zhejiang Univ, Zhejiang Prov Key Lab Sensing Technol, Hangzhou 310058, Zhejiang, Peoples R China..
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering. Zhejiang Univ, Ctr Opt & Electromagnet Res, State Key Lab Modern Opt Instrumentat, JORCEP, Hangzhou 310058, Zhejiang, Peoples R China.;Zhejiang Univ, Natl Engn Res Ctr Opt Instrumentat, Hangzhou 310058, Zhejiang, Peoples R China.;Zhejiang Univ, Zhejiang Prov Key Lab Sensing Technol, Hangzhou 310058, Zhejiang, Peoples R China.;.ORCID iD: 0000-0002-3401-1125
2018 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 427, p. 139-146Article in journal (Refereed) Published
Abstract [en]

We propose a novel beam-compression device to achieve sub-wavelength focusing (SF) by optical surface transformation (a new theoretical branch derived from transformation optics). When a Gaussian beam is incident on the input surface of our device, we can obtain a sub-wavelength focused spot at the output surface of the compression device. The focused mode can still propagate to the far-field and keep very good directivity as incident Gaussian beam. The size of the sub-wavelength beam can be tuned by changing the size of the output surface. We only need one kind of homogeneous anisotropic medium, the optic-null medium (ONM), to realize the proposed beam-compression device. After some simplifications, we design a layered structure of two isotropic homogeneous media to realize the device. Numerical simulations verify the performance of our beam-compression device.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 427, p. 139-146
Keywords [en]
Optical surface transformation, Sub-wavelength focusing, Optic-null medium
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:kth:diva-233583DOI: 10.1016/j.optcom.2018.06.029ISI: 000441174200022Scopus ID: 2-s2.0-85048861666OAI: oai:DiVA.org:kth-233583DiVA, id: diva2:1242410
Note

QC 20180828

Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2018-08-28Bibliographically approved

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