研究目的
To demonstrate single- and dual-wavelength lasing from plasmonic-lattice resonators with integrated quantum dots (QDs) using a flexible template-based fabrication method.
研究成果
The study successfully demonstrates single- and dual-wavelength lasing from plasmonic-lattice resonators integrated with QDs. The flexible template-based fabrication method allows for tunable lasing conditions by adjusting the lattice geometry, QD-film thickness, and substrate refractive index. Dual-wavelength lasing is achieved through two strategies: using rectangular lattice symmetries for polarization-controlled output and leveraging higher-order waveguide modes in thicker QD films for off-normal emission. These findings highlight the potential of QDs as a versatile gain material for on-chip plasmonic lasers.
研究不足
The study is limited by the photostability and wavelength tunability of the QDs used as the gain material. Additionally, the fabrication process's resolution limits the minimum feature size of the plasmonic lattices. The lasing threshold could be further optimized by improving the spectral overlap between the feedback conditions and the QD gain envelope.
1：Experimental Design and Method Selection:
The study employs a template-stripping-based approach to fabricate plasmonic Ag-disk lattices on substrates with tunable refractive indices. Colloidal quantum dots (QDs) are used as the gain material, deposited onto the plasmonic lattices to form dense films. The fabrication method allows for the adjustment of the QD-film thickness and the substrate's refractive index, enabling the exploration of different lasing conditions.
2：Sample Selection and Data Sources:
The samples consist of Ag-disk lattices fabricated on transparent substrates, with QD films of varying thicknesses deposited on top. The optical properties of these structures are characterized using momentum-resolved transmission and emission spectroscopy.
3：List of Experimental Equipment and Materials:
Key equipment includes a thermal evaporator for Ag deposition, a Fourier-imaging setup for optical characterization, and a fs-pulsed laser for excitation. Materials include CdSe/CdS/ZnS core/shell/shell QDs and UV-curable adhesives with tunable refractive indices.
4：Experimental Procedures and Operational Workflow:
The fabrication involves creating a reusable SiO2/Si template, depositing Ag disks, and integrating QD films. Optical measurements are performed to study the lasing behavior under different conditions.
5：Data Analysis Methods:
The band structure and lasing characteristics are analyzed based on momentum-resolved emission spectra and the effective mode indices of waveguide modes supported by the QD films.
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