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High-order harmonics in a quantum dot and metallic nanorod complex
Optics Letters
|October 30, 2015
Summary
High-order harmonic generation in semiconductor quantum dot and metallic nanorod complexes can be controlled by optimizing nanorod shape and distance. This enables generation of extreme ultraviolet supercontinuum harmonics and ultrashort pulses.
Area of Science:
- Quantum optics
- Materials science
- Nanophotonics
Background:
- High-order harmonic generation (HHG) is a key process for generating coherent extreme ultraviolet (XUV) light.
- Semiconductor quantum dots (SQDs) and metallic nanorods (MNRs) offer unique optical properties for light-matter interactions.
Purpose of the Study:
- To investigate HHG in a hybrid SQD-MNR system.
- To explore control over HHG properties by tuning structural parameters.
- To achieve supercontinuum XUV harmonics and ultrashort pulse generation.
Main Methods:
- Numerical simulations of HHG in a coupled SQD-MNR system.
- Utilizing frequency-chirped Gaussian few-cycle laser pulses.
- Varying MNR shape and SQD-MNR surface-to-surface distance.
Main Results:
- Demonstrated control over HHG cutoff energy by structural optimization.
- Achieved generation of extreme ultraviolet supercontinuum harmonics with maximal photon energy of 25 eV.
- Generated isolated ultrashort pulses with a full width at half maximum (FWHM) of 2.67-4.36 fs.
Conclusions:
- The hybrid SQD-MNR complex is a promising platform for tailored HHG.
- Structural engineering of nanostructures allows precise control over generated harmonic spectra.
- The proposed system facilitates efficient generation of ultrashort XUV pulses.
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