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Surface plasmons in a nanostructured black phosphorus flake.
Optics Letters
|September 29, 2017
Summary
Black phosphorus (BP) exhibits unique plasmonic properties for manipulating light at the nanoscale. Its tunable resonance from infrared to terahertz makes it ideal for advanced optoelectronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanophotonics
Background:
- Black phosphorus (BP), a rediscovered layered material, possesses unique electronic and optical properties.
- Its puckered honeycomb structure offers exotic characteristics like layer-independent direct bandgap and linear dichroism.
Purpose of the Study:
- To investigate the plasmonic properties of nanostructured black phosphorus flakes.
- To explore BP's capability for wide-band photon manipulation at the deep subwavelength scale.
Main Methods:
- Fabrication of nanostructured black phosphorus (BP) flakes.
- Characterization of plasmon resonance frequencies and their dependence on layer number and polarization.
- Observation of oblique plasmons in square arrays of BP flakes.
Main Results:
- Strong layer number and polarization-dependent plasmon resonance observed from infrared (IR) to terahertz (THz) frequencies.
- Oblique plasmons demonstrated in BP square arrays with tunable resonant frequencies.
- Significant plasmon-induced absorption achieved in nanostructured BP.
Conclusions:
- Black phosphorus exhibits excellent plasmonic properties, enabling wide-band photon manipulation.
- The tunable resonance and strong absorption make BP a promising material for ultra-scaled optoelectronic integration.
- BP is a strong alternative to existing plasmonic materials for THz to mid-IR applications.
