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Independent control of function and chromatic dispersion in diffractive optical devices with metasurfaces

Arbabi, Ehsan and Arbabi, Amir and Kamali, Seyedeh Mahsa and Horie, Yu and Faraon, Andrei (2017) Independent control of function and chromatic dispersion in diffractive optical devices with metasurfaces. In: High Contrast Metastructures VI. Proceedings of SPIE. No.10113. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 101130P. ISBN 9781510606678. http://resolver.caltech.edu/CaltechAUTHORS:20180628-153035007

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Abstract

Diffractive optical devices have many applications in various fields of optics. A fundamental property of all diffractive devices is their negative chromatic dispersion: a diffractive grating always disperses light in the opposite order compared to a refractive prism made of a material with positive (normal) dispersion. Unlike refractive devices, chromatic dispersion in diffractive devices stems from geometrical features, and cannot be controlled via the intrinsic material dispersion. In addition to the always negative sign, the amplitude of diffractive chromatic dispersion is set only by the function of the device. For instance, the angular dispersion of a grating is always given by dθ/dλ=tan(θ)/λ (where θ is the deflection angle and λ is wavelength), or the focal distance dispersion of a diffractive lens is given by df/dλ=-f/λ. Therefore, the chromatic dispersion of diffractive devices has always been set by their function (e.g. by the deflection angle for a grating or the focal distance for a lens), and could not be controlled separately. Here, we present our work on breaking this fundamental relation between the function and chromatic dispersion of diffractive devices using metasurfaces providing independent control over phase and group delays. We use a reflective dielectric metasurface to experimentally demonstrate gratings and lenses that have positive, zero, and extraordinary negative chromatic dispersion. Apart from its fundamental scientific value, this concept expands the applications of diffractive devices as it enables various types of chromatic dispersions. For instance, a special case would be a dispersionless lens operating over a wide bandwidth with the same focal distance.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2253726DOIArticle
ORCID:
AuthorORCID
Arbabi, Ehsan0000-0002-5328-3863
Arbabi, Amir0000-0001-8831-7552
Horie, Yu0000-0001-7083-1270
Faraon, Andrei0000-0002-8141-391X
Additional Information:© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).
Record Number:CaltechAUTHORS:20180628-153035007
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180628-153035007
Official Citation:Ehsan Arbabi, Amir Arbabi, Seyedeh Mahsa Kamali, Yu Horie, Andrei Faraon, "Independent control of function and chromatic dispersion in diffractive optical devices with metasurfaces (Conference Presentation)", Proc. SPIE 10113, High Contrast Metastructures VI, 101130P (28 April 2017); doi: 10.1117/12.2253726; https://doi.org/10.1117/12.2253726
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87453
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 Jun 2018 16:07
Last Modified:29 Jun 2018 17:11

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