Wednesday Colloquia

Metasurface enabled Spatio-temporal Shaping of Optical Fields

by Prof. Amit Agarwal (NIST USA)

Wednesday, December 11, 2019 from to (Asia/Kolkata)
at Lecture Theatre ( AG-66 )
Over the last decade, flat optical elements composed of an array of deep-subwavelength dielectric or metallic nanostructures – referred to as metasurfaces – have revolutionized the field of optics. Their ability to impart an arbitrary phase, polarization or amplitude modulation to an optical wavefront as well as perform multiple optical transformations simultaneously on the incoming light holds promise for applications requiring compactness, integration and/or multiplexing. Here, we discuss the ability of metasurfaces to arbitrarily shape both the temporal and spatial evolution of optical fields, ranging from the deep-ultraviolet to the terahertz frequency range. By integrating metasurfaces with grating out-couplers directly on a nanophotonic chip, we show the ability to create arbitrary optical fields in the far-field for applications in cold atom traps, biosensing or LIDAR.


S. Divitt, W. Zhu, C. Zhang, H. J. Lezec, and A. Agrawal, “Ultrafast Optical Pulse Shaping Using Dielectric Metasurfaces,” Science 364, 890-894 (2019).