研究目的
Investigating the assembly and properties of a three-dimensional (3D) metamaterial composed of two physical vapor deposition layers and a spray of gold nanospheres (GNS) to observe plasmonic induced transparency (PIT) and its potential applications in enhancing non-linear optical effects, optical switching, and slow light generation in the NIR.
研究成果
The study demonstrates the assembly of a simple 3D metamaterial that exhibits plasmonic induced transparency over a wide spectral bandwidth. The transition from induced transparency to induced absorption is observed with multiple deposits of GNS, indicating critical coupling between the two metasurfaces. This metamaterial has potential applications in enhancing non-linear optical effects, optical switching, and slow light generation in the NIR.
研究不足
The study is limited by the crude method of dispensing GNS with a calibrated syringe, which could be optimized with an automatic spray machine. The internal damping is set by the dark metasurface, and the condition of critical coupling is qualitatively demonstrated.
1：Experimental Design and Method Selection:
The study involves assembling a 3D metamaterial with two physical vapor deposition layers (one metallic and one dielectric) and spraying gold nanospheres (GNS) on top. The first layer is a semicontinuous gold nanocomposite transformed into a 'dark metasurface' when embedded in a dielectric nanocavity. The second layer is a radiative mirror composed of self-arranged GNS at the nanocavity’s surface.
2：Sample Selection and Data Sources:
A square Corning Eagle XG glass substrate is used. The gold first layer is deposited by cathodic sputtering, and the TiO2 layer is deposited by electron beam physical vapor deposition. GNS are spread with a calibrated syringe.
3：List of Experimental Equipment and Materials:
Corning Eagle XG glass substrate, gold target, argon ions, Ti3O5 load, GNS suspension, Perkin-Elmer Lambda 900 spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The substrate is washed, and layers are deposited successively. Optical characterizations are performed at quasi-normal incidence.
5：Data Analysis Methods:
The absorption A is determined as A = 1-R-T where T is the transmission and R the reflection from the substrate side.
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