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Controlling the sign of chromatic dispersion in diffractive optics with dielectric metasurfaces

Arbabi, Ehsan and Arbabi, Amir and Kamali, Seyedeh Mahsa and Horie, Yu and Faraon, Andrei (2017) Controlling the sign of chromatic dispersion in diffractive optics with dielectric metasurfaces. Optica, 4 (6). pp. 625-632. ISSN 2334-2536.

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Diffraction gratings disperse light in a rainbow of colors with the opposite order than refractive prisms, a phenomenon known as negative dispersion. While refractive dispersion can be controlled via material refractive index, diffractive dispersion is fundamentally an interference effect dictated by geometry. Here we show that this fundamental property can be altered using dielectric metasurfaces, and we experimentally demonstrate diffractive gratings and focusing mirrors with positive, zero, and hyper-negative dispersion. These optical elements are implemented using a reflective metasurface composed of dielectric nano-posts that provide simultaneous control over phase and its wavelength derivative. In addition, as a first practical application, we demonstrate a focusing mirror that exhibits a five-fold reduction in chromatic dispersion, and thus an almost three-times increase in operation bandwidth compared with a regular diffractive element. This concept challenges the generally accepted dispersive properties of diffractive optical devices and extends their applications and functionalities.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Arbabi, Ehsan0000-0002-5328-3863
Arbabi, Amir0000-0001-8831-7552
Kamali, Seyedeh Mahsa0000-0002-6968-811X
Horie, Yu0000-0001-7083-1270
Faraon, Andrei0000-0002-8141-391X
Alternate Title:Controlling the sign of chromatic dispersion in diffractive optics
Additional Information:© 2017 Optical Society of America. Received 22 February 2017; revised 3 May 2017; accepted 5 May 2017 (Doc. ID 287279); published 7 June 2017. Funding: Samsung Electronics; National Science Foundation (NSF) (1512266); U.S. Department of Energy (DOE) (DESC0001293); Defense Advanced Research Projects Agency (DARPA). E. A., A. A., and A. F. conceived the experiment. E. A., S. M. K., and Y. H. fabricated the samples. E. A., S. M. K., A. A., and Y. H. performed the simulations and measurements and analyzed the data. E. A., A. F., and A. A. co-wrote the paper. All authors discussed the results and commented on the paper. E. A. and A. A. were also supported by NSF. A. A. and Y. H. were also supported by DARPA, and S. M. K. was supported as part of the DOE “Light-Material Interactions in Energy Conversion,” Energy Frontier Research Center. The device nanofabrication was performed at the Kavli Nanoscience Institute at Caltech.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Samsung ElectronicsUNSPECIFIED
Department of Energy (DOE)DE-SC0001293
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Issue or Number:6
Classification Code:OCIS codes: (260.2030) Dispersion; (050.6624) Subwavelength structures; (050.1965) Diffractive lenses; (220.1000) Aberration compensation
Record Number:CaltechAUTHORS:20170605-090534483
Persistent URL:
Official Citation:Ehsan Arbabi, Amir Arbabi, Seyedeh Mahsa Kamali, Yu Horie, and Andrei Faraon, "Controlling the sign of chromatic dispersion in diffractive optics with dielectric metasurfaces," Optica 4, 625-632 (2017)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77941
Deposited By: Tony Diaz
Deposited On:06 Jun 2017 19:06
Last Modified:03 Oct 2019 18:03

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