Controlling the sign of chromatic dispersion in diffractive optics with dielectric metasurfaces
- California Inst. of Technology (CalTech), Pasadena, CA (United States). T. J. Watson Lab. of Applied Physics; California Inst. of Tech., Pasadena, CA (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States). T. J. Watson Lab. of Applied Physics; Univ. of Massachusetts, Amherst, MA (United States). Dept. of Electrical and Computer Engineering
- California Inst. of Technology (CalTech), Pasadena, CA (United States). T. J. Watson Lab. of Applied Physics
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.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI); California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF) (United States); Defense Advanced Research Projects Agency (DARPA) (United States)
- Grant/Contract Number:
- SC0001293
- OSTI ID:
- 1467089
- Journal Information:
- Optica, Journal Name: Optica Journal Issue: 6 Vol. 4; ISSN 2334-2536
- Publisher:
- Optical Society of AmericaCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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