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Enhanced Third-Order Optical Nonlinearity Driven by Surface-Plasmon Field Gradientsстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Kravtsov V.A., AlMutairi Sultan, Ulbricht Ronald, Kutayiah A.Ryan, Belyanin Alexey, Raschke Markus B.
- Журнал: Physical Review Letters
- Том: 120
- Номер: 20
- Год издания: 2018
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 1
- Последняя страница: 6
- Номер статьи: 203903
- DOI: 10.1103/physrevlett.120.203903
- Аннотация: Efficient nonlinear optical frequency mixing in small volumes is key for future on-chip photonic devices. However, the generally low conversion efficiency severely limits miniaturization to nanoscale dimensions. Here we demonstrate that gradient-field effects can provide for an efficient, conventionally dipole-forbidden nonlinear response. We show that a longitudinal nonlinear source current can dominate the third-order optical nonlinearity of the free electron response in gold in the technologically important near-IR frequency range where the nonlinearities due to other mechanisms are particularly small. Using adiabatic nanofocusing to spatially confine the excitation fields, from measurements of the 2ω1−ω2 four-wave mixing response as a function of detuning ω1−ω2, we find up to 10−5 conversion efficiency with a gradient-field contribution to χ(3)Au of up to 10−19m2/V2. The results are in good agreement with the theory based on plasma hydrodynamics and underlying electron dynamics. The associated increase in the nonlinear conversion efficiency with a decreasing sample size, which can even overcompensate the volume decrease, offers a new approach for enhanced nonlinear nano-optics. This will enable more efficient nonlinear optical devices and the extension of coherent multidimensional spectroscopies to the nanoscale.
- Добавил в систему: Коновко Андрей Андреевич