The present invention relates to a device that utilizes oscillation of electrons in metals for manipulating electromagnetic radiation. The device is capable of concentrating electromagnetic energy at a focal spot with an intensity of almost 3.5 times more than incident wave. A multifold enhancement in the efficiency of currently existing devices is thereby possible, when incorporated with the device. The device also demonstrates achromatic behavior and it gives it an additional advantage of focusing all wavelengths at same focal spot, within operating range of device spatially. The plasmonic lens can be easily fabricated using existing lithographic techniques, so is compatible with existing cMOS based technologies. Further, the focal length of the device can be tuned from 2μm to 18um. The device is optimized for 400nm-700nm region but the same can be expanded to entire uv-vis-NIR region of the spectrum allowing a tremendous increase in the efficiency of all the devices.
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