Design of hybrid narrow-band plasmonic absorber based on chalcogenide phase change material in the infrared spectrum

Abstract

Structures absorbing electromagnetic waves in the infrared spectral region are important optical components in key areas such as biosensors, infrared images, thermal emitters, and special attention is required for reconfigurable devices. We propose a three-dimensional metal-dielectric plasmonic absorber with a layer of PCM’s (Phase Change Materials). The phase shift effects of PCMs are numerically analyzed, and it is possible to obtain a shifting control of the resonant absorption peaks between the amorphous and crystalline states using the Lorentz–Lorenz relation. By using this empirical relation, we analyzed the peak absorption shift at intermediate phases between the amorphous and the crystalline. The geometric parameters of the structure with the PCM layer in the semi-crystalline state were adjusted to exhibit strong absorption for normal incidence. The effects of the oblique incidence on the absorption for the TM and TE polarization modes were also analyzed. Our results demonstrate that PCMs have great potential for reconfigurable nanophotonic devices.

Colloidal Plasmonic Metasurfaces for the Enhancement of Non‐Linear Optical Processes and Molecular Spectroscopies

“…Ultimately, these technological and scientific advancements made concepts such as metaoptics and meta-lenses a reality, encompassing architectures capable of manipulating light polarization, phase, and wavefront, as well as controlling both absorption and emission phenomena. [14][15][16][17] The possibility of applying engineered artificial optical properties to manipulate light-matter interactions created a fertile area for the exploration of non-linear (NL) phenomena, exploiting the incredible flexibility in the near-field electromagnetic response.…”

“…These restrictions established a tight feedback loop between metamaterial scientific research and nanofabrication techniques such as optical and electron lithography, which were initially developed for semiconductor manufacturing, and enabled the preparation of metallic plasmonic nanostructures of different geometries and 3‐dimensional organization with nanometer‐scale precision. Ultimately, these technological and scientific advancements made concepts such as metaoptics and meta‐lenses a reality, encompassing architectures capable of manipulating light polarization, phase, and wavefront, as well as controlling both absorption and emission phenomena [14–17] . The possibility of applying engineered artificial optical properties to manipulate light‐matter interactions created a fertile area for the exploration of non‐linear (NL) phenomena, exploiting the incredible flexibility in the near‐field electromagnetic response.…”

Programmable Nanophotonic Planar Resonator Filter-Absorber based on Phase-Change InSbTe

“…The efficient control of electromagnetic waves in terahertz (THz) regions with the use of reconfigurable photonic devices is already an invaluable reality especially when it comes to metasurfaces [1][2][3][4], metalenses [5][6], plasmonic [7][8] and metamaterial absorbers [9][10]. In this context, non-volatile chalcogenide phase change materials (PCM's) [11][12][13][14] exhibit great advantage, due to their thermal stability, a guarantee of non-volatility in the drastic changes existing between the amorphous and crystalline states, ultra-fast switching between phases (nanoseconds for femtoseconds) and their optical constants values over a wide range of the electromagnetic spectrum.…”