Imperial College London
Alternate

ProfessorRichardCraster

Faculty of Natural Sciences

Dean of the Faculty of Natural Sciences
 
 
 
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Contact

 

+44 (0)20 7594 8554r.craster Website

 
 
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Assistant

 

Miss Hannah Cline +44 (0)20 7594 1934

 
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Location

 

3.05Faculty BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Chaplain:2020:10.1103/PhysRevB.101.155430,
author = {Chaplain, GJ and Craster, R},
doi = {10.1103/PhysRevB.101.155430},
journal = {Physical Review B: Condensed Matter and Materials Physics},
pages = {155430  1--155430  9},
title = {Ultrathin entirely flat Umklapp lenses},
url = {http://dx.doi.org/10.1103/PhysRevB.101.155430},
volume = {101},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We design ultra-thin, entirely flat, dielectric lenses using crystal momentum transfer, so-called Umklapp processes, achieving the required wave control for a new mechanism of flat lensing; physically, these lenses take advantage of abrupt changes in the periodicity of a structured line array so there is an overlap between the first Brillouin zone of one medium with the second Brillouin zone of the other. At the interface between regions of different periodicity, surface, array guided waves hybridize into reversed propagating beams directed into the material exterior to the array. This control, and redirection, of waves then enables the device to emulate a Pendry-Veselago lens that is one unit cell in width, with no need for an explicit negative refractive index. Simulations using an array embedded in an idealized slab of silicon nitride (Si3N4) in air, operating at visible wavelengths between 420–500THz demonstrate the effect.
AU  - Chaplain,GJ
AU  - Craster,R
DO  - 10.1103/PhysRevB.101.155430
EP  - 1
PY  - 2020///
SN  - 1098-0121
SP  - 155430
TI  - Ultrathin entirely flat Umklapp lenses
T2  - Physical Review B: Condensed Matter and Materials Physics
UR  - http://dx.doi.org/10.1103/PhysRevB.101.155430
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000529070900009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://journals.aps.org/prb/abstract/10.1103/PhysRevB.101.155430
UR  - http://hdl.handle.net/10044/1/79240
VL  - 101
ER  -
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