Controlling the sign of chromatic dispersion in diffractive optics

By E. Arbabi, Amir Arbabi, Seyedeh Mahsa Kamali, Y. Horie, A. Faraon. 2017

203 citations recorded by the source corpus.

Diffraction gratings disperse light in a rainbow of colors with the opposite order than refractive prisms, a phenomenon known as negative dispersion [1, 2]. 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 [3-5], 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 to a regular diffractive element. This concept challenges the generally accepted dispersive properties of diffractive optical devices and extends their applications and functionalities.

Subfields: Aerospace Engineering, Biomedical Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/351013ad5ceb177fd23fd369518e56e3779e96db

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In Aerospace Engineering

1. Seyedeh Mahsa Kamali
2. E. Arbabi
3. A. Faraon
4. Amir Arbabi
5. Y. Horie

In Biomedical Engineering

1. A. Faraon
2. Seyedeh Mahsa Kamali
3. E. Arbabi
4. Amir Arbabi

In Electronic, Optical and Magnetic Materials

1. Seyedeh Mahsa Kamali
2. E. Arbabi
3. A. Faraon
4. Amir Arbabi
5. Y. Horie

Citations in the corpus

• Full-Stokes Imaging Polarimetry Using Dielectric Metasurfaces (2018, methodology): “ as in a realistic device. To achieve smaller pixel sizes, better performance, and larger operation bandwidths one could use more advanced optimization [59] or chromatic-dispersion control techniques [60], especially since the size of a single superpixel is small and allows for a fast simulation of ”
• Imaging based on metalenses (2020, background): “SEM of the fabricated nano-posts and devices [60].”