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Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
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Grating enhanced apertureless near-field optical microscopy.

Josip Mihaljevic, Christian Hafner, Alfred J Meixner

    Optics Express
    |July 21, 2015
    PubMed
    Summary

    Optimized nano-antennas with non-periodic gratings enhance quantum emitter signals. These structured tips enable control over plasmonic resonances and directivity for improved near-field and far-field coupling.

    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Quantum Optics

    Background:

    • Apertureless plasmonic tips are crucial for enhancing light-matter interactions at the nanoscale.
    • Controlling near-field signals and emission properties of quantum emitters near nanostructures remains a challenge.

    Purpose of the Study:

    • To optimize the emission and near-field signal of apertureless silver and gold tips using a non-periodic grating.
    • To investigate the influence of structured tips on quantum emitter decay rates and far-field coupling efficiency.

    Main Methods:

    • Utilizing an optimized non-periodic grating in conjunction with apertureless silver and gold tips.
    • Simulating the emission of a single quantum emitter in proximity to these structured tips.
    • Analyzing the far-field coupling efficiency of a focused beam to the tip's near-field.

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    Main Results:

    • Structured tips exhibit significant enhancement of the total decay rate due to standing plasmonic waves, showing resonant behavior explained by a Fabry-Pérot model.
    • The total decay rate can be tuned, even decreased, by shifting the grating from the optimal resonant position.
    • Performance gains are compared to unstructured tips and pure plasmonic excitation.

    Conclusions:

    • The proposed non-periodic grating scheme creates a novel nano-antenna with tunable resonance and directivity.
    • Optimized structured tips offer enhanced control over light-matter interactions for quantum emitters.
    • This approach provides a pathway for improved nano-antenna design in nanophotonics and quantum optics.