研究目的
Investigating the lasing action in optimized two-dimensional iron-nail-shaped rod photonic crystals by optical pulse pumping at room temperature.
研究成果
The study successfully demonstrated lasing from the first Γ-point band-edge mode in optimized iron-nail-shaped rod photonic crystals, achieving a high quality factor and reduced modal volume. The lasing action was confirmed through numerical simulations and experimental measurements, showing good agreement in terms of wavelength, polarization, and near-field image. The optimized rod-type band-edge laser is considered promising for practical applications such as sensing molecules in fluids or gases.
研究不足
The study acknowledges discrepancies between the calculated and measured near-field images due to limitations in applying the real vertical shape of the iron nail for the FDTD simulation. Additionally, the lasing threshold was higher than in previous reports due to different quantum well structures and pumping conditions.
1：Experimental Design and Method Selection:
The study involved the optimization of two-dimensional iron-nail-shaped rod photonic crystals to enhance the quality factor of the Γ-point band-edge modes. The methodology included numerical simulations using the three-dimensional finite-difference time-domain (FDTD) method to analyze the optical properties and lasing action.
2：Sample Selection and Data Sources:
Fabricated arrays of iron-nail-shaped rods with InGaAsP multiple quantum wells embedded in the nail heads were used. The samples were characterized using scanning electron microscopy (SEM) and optical measurements.
3：List of Experimental Equipment and Materials:
Equipment included a 980-nm laser diode for optical pulse pumping, an anti-reflection coated 40 × aspheric lens, an infrared charge-coupled device (CCD) camera, and a monochromator. Materials included InGaAsP quantum wells and InP post structures.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved electron-beam lithography, Ar ion bombardment, Cl2-assisted ion-beam etching, and selective wet etching. Optical measurements were performed to characterize the lasing action.
5：Data Analysis Methods:
The lasing spectra, near-field images, and polarization were analyzed to confirm the lasing mode and its properties.
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