研究目的
Investigating the fabrication of large-scale freestanding THz wire grid polarizers by femtosecond laser micromachining and comparing their performance with commercial wire grid polarizers.
研究成果
The fabrication of large-scale freestanding THz wire grid polarizers with reinforced line structures using femtosecond laser micromachining was successful. The polarizers with discontinuous reinforced lines exhibited better performance than commercial wire grid polarizers, as confirmed by FDTD simulations and THz-TDS measurements.
研究不足
The study focuses on the fabrication and performance comparison of THz wire grid polarizers but does not explore the potential for further miniaturization or integration into more complex THz systems.
1：Experimental Design and Method Selection:
The study employed femtosecond laser micromachining (FLM) to fabricate freestanding THz wire grid polarizers with reinforced line structures to mitigate gravity sagging and wire entanglement. The performance was simulated using the Finite-Difference Time-Domain (FDTD) method and characterized by THz time-domain spectroscopy (THz-TDS).
2：Sample Selection and Data Sources:
Two types of samples with different reinforced line structures were fabricated on 10 μm Al foils. A commercial wire grid polarizer was used for comparison.
3：List of Experimental Equipment and Materials:
A femtosecond laser with a wavelength of 800 nm, pulse width of 45 fs, and repetition rate of 1 KHz was used. The Al foil was placed on a precision translation platform.
4：Experimental Procedures and Operational Workflow:
The Al foil was processed with FLM to create wire grid structures, followed by immersion in water to remove the substrate. The samples were then characterized using THz-TDS.
5：Data Analysis Methods:
The transmittance, degree of polarization, and extinction ratio were calculated and compared with FDTD simulation results.
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