研究目的
To demonstrate the emission redirection capabilities of a single isolated nanoaperture milled in a thick silver film deposited on a dielectric multilayer, specifically showing that a dye can couple to Tamm Plasmon Polariton modes, resulting in directional fluorescence emission.
研究成果
The research demonstrates that fluorophores in nanoapertures can couple to Tamm Plasmon Polaritons, enabling directional fluorescence emission. This is effective for various aperture shapes and sizes, with potential applications in high-throughput sensing and bioanalysis. Future work could explore different materials and optimize for broader wavelength ranges.
研究不足
The study is limited to specific materials (silver, SiO2, Si3N4) and fluorescent dyes (Rhodamine B). The random orientation and movement of molecules in solution may affect coupling efficiency. Fabrication complexity and scalability for large-scale applications are not fully addressed.
1：Experimental Design and Method Selection:
The study involves fabricating nanoapertures in a silver film on a dielectric multilayer to investigate coupling with Tamm Plasmon Polaritons. Methods include focused ion beam milling, fluorescence spectroscopy, and finite difference time domain modeling.
2：Sample Selection and Data Sources:
Samples consist of silver films with nanoapertures of various diameters (e.g., 200, 400, 620, 800, 1000 nm) and shapes (circles, squares, triangles) deposited on dielectric multilayers of SiO2 and Si3N4. Fluorescent molecules (Rhodamine B) in ethanol are used.
3：Fluorescent molecules (Rhodamine B) in ethanol are used. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes focused ion beam (FIB) for milling, scanning electron microscope (SEM) for imaging, oil immersion objective (1.35 N.A.), scientific camera (Andor Neo sCMOS), CCD camera (Lumenera INFINITY2-1M), spectrometer (ihR 550, HORIBA Scientific), bandpass filters (560 ± 2 nm, 580 ± 2 nm, 600 ± 2 nm), and FDTD software (Lumerical Inc.). Materials include silver film, SiO2, Si3N4, ethanol, Rhodamine B dye.
4：35 N.A.), scientific camera (Andor Neo sCMOS), CCD camera (Lumenera INFINITY2-1M), spectrometer (ihR 550, HORIBA Scientific), bandpass filters (560 ± 2 nm, 580 ± 2 nm, 600 ± 2 nm), and FDTD software (Lumerical Inc.). Materials include silver film, SiO2, Si3N4, ethanol, Rhodamine B dye. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Nanoapertures are fabricated by FIB milling. Fluorescent solution is spotted on the sample. Excitation is done with a 532 nm laser from the bottom using an oil immersion objective. Fluorescence is collected via back focal plane (BFP) and front focal plane (FFP) imaging. Angular emission patterns are analyzed.
5：Data Analysis Methods:
Data is analyzed using FDTD simulations for near-field and far-field projections, and experimental images are processed to derive radiation patterns by averaging over azimuthal angles.
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Scientific Camera
Neo sCMOS
Andor
Capturing back focal plane images
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Spectrometer
ihR 550
HORIBA Scientific
Collecting fluorescence spectra
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Focused Ion Beam
Milling nanoapertures in silver films
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Scanning Electron Microscope
Imaging nanoapertures
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Oil Immersion Objective
1.35 N.A.
Focusing excitation laser and collecting fluorescence
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CCD Camera
INFINITY2-1M
Lumenera
Capturing front focal plane images
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Bandpass Filter
Selecting specific fluorescence wavelengths
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FDTD Software
Lumerical Inc.
Modeling near-field and far-field emissions
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