研究目的
Investigating the strong light-matter interaction of metamaterial ‘quasi-particles’ with photons in a photonic crystal cavity in the terahertz frequency range.
研究成果
The study demonstrates a new type of strong light-matter interaction of metamaterial ‘quasi-particles’ with photons in a photonic crystal cavity in the terahertz frequency range. The measured Rabi splitting shows a square-root dependence on the density of metamaterial unit cells, indicating nonlocal collective strong interactions. These findings open new routes to take advantage of the rich functionalities of MMs and enable versatile applications in the terahertz frequency domain.
研究不足
The fundamental research and applications are limited in these experiments due to the nano-scale size of the required structures. In the terahertz frequency range, it is difficult to realize a cavity with simple metallic reflectors due to the strong Drude absorption of free-carriers in metal.
1：Experimental Design and Method Selection:
The study employs 1D photonic crystal cavities composed of a central thick Si layer as a ‘defect’ layer between two Bragg mirrors, each consisting of two pairs of thin Si dielectric layers and air layers. The interaction of cavity photons with Swiss-cross and split-ring-resonator (SRR) metamaterials (MM) was investigated.
2：Sample Selection and Data Sources:
The MM were positioned at the electric field anti-node position of the cavity standing wave. The resonance frequency of the MM was tuned across the resonance frequency of the cavity.
3：List of Experimental Equipment and Materials:
Photonic crystal cavities, Swiss-cross and split-ring-resonator (SRR) metamaterials, terahertz TDS measurements setup.
4：Experimental Procedures and Operational Workflow:
The transmittance spectra were measured when Swiss-cross MM were positioned in the cavity. The Rabi splitting was measured as a function of the unit cell densities of the SRR.
5：Data Analysis Methods:
The coupled modes were simulated by a coupled-harmonic-oscillator model. The Rabi splitting as a function of the unit cell densities was fit with a square-root density dependence.
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