Abstract
We report on the tunable edge-plasmon-enhanced absorption of phosphorene nanoribbons supported on a dielectric substrate. Monolayer anisotropic black phosphorous (phosphorene) nanoribbons are explored for light trapping and absorption enhancement on different dielectric substrates. We show that these phosphorene ribbons support infrared surface plasmons with high spatial confinement. The peak position and bandwidth of the calculated phosphorene absorption spectra are tunable with low loss over a wide wavelength range via the surrounding dielectric environment of the periodic nanoribbons. Simulation results show strong edge plasmon modes and enhanced absorption as well as a red-shift of the peak resonance wavelength. The periodic Fabry-Perot grating model was used to analytically evaluate the absorption resonance arising from the edge of the ribbons for comparison with the simulation. The results show promise for the promotion of phosphorene plasmons for both fundamental studies and potential applications in the infrared spectral range.
Highlights
Studies of the light-matter interaction have been conducted for many materials, commonly focusing on noble metal films and nanostructures
Theoretical and simulation results have revealed that properties of black phosphorous surface plasmons include polarization dependence when exposed to an electromagnetic field[21,22], dependence on the size of the monolayer[23], a quantized magnetic field indicated by discretized anisotropic magneto-excitons[24], and damping point defects and potential for long-range disorder[25]
We explore black phosphorus (BP) as an alternative 2D material to address the challenges faced by metals and graphene for surface plasmon resonance responses to incident light in the mid- to far-infrared spectral range
Summary
Studies of the light-matter interaction have been conducted for many materials, commonly focusing on noble metal films and nanostructures. Theoretical and simulation results have revealed that properties of black phosphorous surface plasmons include polarization dependence when exposed to an electromagnetic field[21,22], dependence on the size of the monolayer[23], a quantized magnetic field indicated by discretized anisotropic magneto-excitons[24], and damping point defects and potential for long-range disorder[25] These features are attributed to its high mobility and highly tunable, layer-dependent, direct bandgap (0.3 eV in bulk to 2 eV in a monolayer)[26,27,28], as well as its highly anisotropic in-plane electronic and optical properties[28]. Phonon-related damping pathways for BP plasmons remain unknown, this work highlights several attractive features of tunable mid- to far-infrared BP plasmons
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