Low-voltage broadband hybrid plasmonic-vanadium dioxide switches

TL;DR

This paper demonstrates a compact, broadband, and efficient plasmonic switch using vanadium dioxide's phase transition, achieving high extinction ratios at low voltages near 1550 nm wavelength.

Contribution

It introduces a novel low-voltage, broadband plasmonic switch leveraging vanadium dioxide's phase transition for improved performance.

Findings

Switching bandwidths exceed 100 nm.

Extinction ratios surpass 20 dB at 400 mV.

Device length is on the micron scale.

Abstract

Surface plasmon polaritons can substantially reduce the sizes of optical devices, since they can concentrate light to (sub)wavelength scales. However, (sub)wavelength-scale electro-optic plasmonic switches or modulators with high efficiency, low insertion loss, and high extinction ratios remain a challenge due to their small active volumes. Here, we use the insulator-metal phase transition of a correlated-electron material, vanadium dioxide, to overcome this limitation and demonstrate compact, broadband, and efficient plasmonic switches with integrated electrical control. The devices are micron-scale in length and operate near a wavelength of 1550 nm. The switching bandwidths exceed 100 nm and applied voltages of only 400 mV are sufficient to attain extinction ratios in excess of 20 dB. Our results illustrate the potential of using phase transition materials for highly efficient and ultra-compact plasmonic switches and modulators.