Figure 2 (IMAGE)

Columbia University School of Engineering and Applied Science

Figure 2

Caption

Top row: (Left) Illustration showing the operation of a wavelength-selective metalens, with “green” light being focused, while the other colors are passed without distortion. (Middle) Optical image of a wavelength-selective metalens composed of rectangular apertures etched into a silicon thin film. (Right) Scanning electron microscope (SEM) images of the metalens at its center and edge. Bottom row: A series of two-dimensional (2D) far-field scans shows that focusing is most efficient at the center of the resonance, λ= 1590 nm, with the focusing efficiency dropping at the two shoulders of the resonance, λ= 1575 nm and 1600 nm, and that the focal spots become almost undetectable at wavelengths tens of nanometers away from the center of the resonance

Credit

Nanfang Yu, Stephanie Malek, Adam Overvig/Columbia Engineering

Usage Restrictions

Please credit as: Nanfang Yu, Stephanie Malek, Adam Overvig/Columbia Engineering

License

Original content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.