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Experimental demonstration of a unidirectional reflectionless parity-time metamaterial at optical frequencies

Feng, Liang and Xu, Ye-Long and Fegadolli, William S. and Lu, Ming-Hui and Oliveira, José E. B. and Almeida, Vilson R. and Chen, Yan-Feng and Scherer, Axel (2013) Experimental demonstration of a unidirectional reflectionless parity-time metamaterial at optical frequencies. Nature Materials, 12 (2). pp. 108-113. ISSN 1476-1122.

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Invisibility by metamaterials is of great interest, where optical properties are manipulated in the real permittivity– permeability plane. However, the most effective approach to achieving invisibility in various military applications is to absorb the electromagnetic waves emitted from radar to minimize the corresponding reflection and scattering, such that no signal gets bounced back. Here, we show the experimental realization of chip-scale unidirectional reflectionless optical metamaterials near the spontaneous parity-time symmetry phase transition point where reflection from one side is significantly suppressed. This is enabled by engineering the corresponding optical properties of the designed paritytime metamaterial in the complex dielectric permittivity plane. Numerical simulations and experimental verification consistently exhibit asymmetric reflection with high contrast ratios around a wavelength of of 1,550 nm. The demonstrated unidirectional phenomenon at the corresponding parity-time exceptional point on-a-chip confirms the feasibility of creating complicated on-chip parity-time metamaterials and optical devices based on their properties.

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Additional Information:© 2012 Macmillan Publishers Limited. Received 22 August 2012; accepted 22 October 2012; published online 25 November 2012. We acknowledge critical support and infrastructure provided for this work by the Kavli Nanoscience Institute at Caltech. This work was supported by the NSF ERC Center for Integrated Access Networks (no. EEC-0812072), the National Basic Research of China (no. 2012CB921503 and no. 2013CB632702), the National Nature Science Foundation of China (no. 11134006), the Nature Science Foundation of Jiangsu Province (no. BK2009007), the Priority Academic Program Development of Jiangsu Higher Education, and CAPES and CNPQ-Brazilian Foundations. M-H.L. also acknowledges the support of FANEDD of China. Author contributions: L.F. and M-H.L. conceived the idea. L.F., Y-L.X. and M-H.L. designed the device. Y-L.X., L.F. and M-H.L. performed the theoretical analysis of parity-time symmetry. W.S.F. and L.F. designed the chip and carried out fabrications and measurements. All the authors contributed to discussion of the project. Y-F.C. and A.S. guided the project. L.F. wrote the manuscript with revisions from other authors.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Kavli Nanoscience Institute (KNI)UNSPECIFIED
National Basic Research of China2012CB921503
National Basic Research of China2013CB632702
National Nature Science Foundation of China11134006
Nature Science Foundation of Jiangsu ProvinceBK2009007
Jiangsu Higher Education Priority Academic Program DevelopmentUNSPECIFIED
Subject Keywords:Optical, photonic and optoelectronic materials, Nanoscale materials, Computation, modelling and theory
Issue or Number:2
Record Number:CaltechAUTHORS:20130205-131334517
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36786
Deposited By: Tony Diaz
Deposited On:05 Feb 2013 23:02
Last Modified:03 Oct 2019 04:41

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