Electrically Tunable All-PCM Visible Plasmonics

Abstract

The realization of electrically tunable plasmonic resonances in the ultraviolet (UV) to visible spectral band is particularly important for active nanophotonic device applications. However, the plasmonic resonances in the UV to visible wavelength range cannot be tuned due to the lack of tunable plasmonic materials. Here, we experimentally demonstrate tunable plasmonic resonances at visible wavelengths using a chalcogenide semiconductor alloy such as antimony telluride (Sb 2 Te 3 ), by switching the structural phase of Sb 2 Te 3 from amorphous to crystalline. We demonstrate the excitation of a propagating surface plasmon with a high plasmonic figure of merit in both amorphous and crystalline phases of Sb 2 Te 3 thin films. We show polarizationdependent and -independent plasmonic resonances by fabricating one and two-dimensional periodic nanostructures in Sb 2 Te 3 thin films, respectively. Moreover, we demonstrate electrically tunable plasmonic resonances using a microheater integrated with the Sb 2 Te 3 /Si device. The developed electrically tunable Sb 2 Te 3 -based plasmonic devices could find applications in the development of active color filters.

Wide‐Angle Tunable Critical Coupling in Nanophotonic Optical Coatings with Low‐Loss Phase Change Material

“…While the stack shows the maximum phase modulation at the Brewster angle, above 100° phase modulation is still possible by selecting an incident angle around the Brewster angle. The electrical continuous tuning of the reflected phase with reversible tunability is possible by integrating the thin film stack with a microheater device [ 29,55,56 ] and it could be a promising platform for flat optics applications. [ 57 ]…”

GeTe2 Phase Change Material for Terahertz Devices with Reconfigurable Functionalities Using Optical Activation

“…3,4,6 It is with the help of such materials that the breakthrough in photonic technologies was made, which in its turn gave rise to such applications as magnetic resonance imaging, 12 imaging, 13 and holography 14 as well as design of sensors, 7,8,15 filters, 16,17 absorbers, 18,19 "invisible cloaks", 20 MEMS, 21 elements for storage-class memories, 22,23 and plasmonics. 10 Normally, properties of optical devices designed with the use of such materials cannot be changed after they are manufactured. In the past years, with the intensive development of THz technologies, artificial materials got a new perspective, which was determined by the impact of conductivity on dielectric properties of matter in this frequency range, providing an opportunity to change the THz photonic properties of such materials.…”

Extremely Narrow and Actively Tunable Mie Surface Lattice Resonances in GeSbTe Metasurfaces: Study

“…Phase-change materials, such as germanium-antimony-telluride (Ge x Sb y Te z , GST) [16], Sb [17], Sb 2 Te 3 [18], Sb 2 S 3 , and Sb 2 Se 3 [19,20], have shown to be a nonvolatile and reconfigurable platform for achieving dynamical tuning of various optical resonances. As the most commonly used material, GST provides nonvolatile, rapid, and reversible switching between the amorphous and the crystalline states by electrical or optical stimuli, significant refractive index differences between these two states, and high chemical and long-term stability [16,[21][22][23].…”