Revealing nonlinear plasmon-photon interactions using k-space spectroscopy

Grosse, Nicolai B.; Heckmann, Jan; Woggon, U.

doi:10.1364/qels.2012.qtu1f.2

Cited by 8 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, SHG is forbidden in these bulk materials in the electric dipole approximation. To generate SHG, symmetry breaking originated from the metal surface, , local geometry, − and noncentrosymmetric meta-atom shape is necessary. In this aspect, the geometry of V-shaped nanogroove is effective for plasmon-enhanced SHG.…”

Section: Spatially Uniform and Spectrally Tunable Shg From Frequency-...mentioning

confidence: 99%

Plasmonic Metasurfaces for Nonlinear Optics and Quantitative SERS

et al. 2016

View full text Add to dashboard Cite

Plasmonic metasurfaces consist of two-dimensional arrays of metallic nanoresonators (plasmonic "metaatoms"), which exhibit collective and tunable resonance properties controlled by electromagnetic near-field coupling. These man-made surfaces can produce a range of unique optical properties unattainable with natural materials. In this review, we focus on the emerging applications of metasurfaces with precisely engineered plasmonic properties for nonlinear optics and surface-enhanced Raman spectroscopy (SERS). In practice, these applications are quite susceptible to material losses and structural imperfections, such as variations in size, shape, periodicity of meta-atoms, and their material states (crystallinity, impurity, and oxidation, etc.). In these aspects, conventional top-down lithographic techniques are facing major challenges due to inherent limitations in intrinsic material properties and material quality introduced during growth, synthesis, and fabrication processes, as well as achievable lithographic resolution. Moreover, they are prohibitively expensive and timeconsuming for fabrication over large areas. Here, we show that colloidal silver crystals (millimeter-sized single-crystalline plates and thiolate-capped nanoparticles) synthesized by solution-based chemical methods are excellent material platforms for the fabrication of high-quality plasmonic metasurfaces. In particular, both top-down (focused ion-beam milling) and bottom-up (centimeter-scale self-assembly) techniques can be exploited to generate uniform and precisely engineered colloidal metasurfaces for broadband tunable (across the full visible range) second-harmonic generation and quantitative SERS at the single-molecule level.

show abstract

Section: Spatially Uniform and Spectrally Tunable Shg From Frequency-...mentioning

confidence: 99%

Plasmonic Metasurfaces for Nonlinear Optics and Quantitative SERS

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Nonlinear frequency conversion has been studied in different systems, ranging from dielectrics and metals to semiconductors, in bulk form as well as micro- and nanostructured. − Nonlinear plasmonics, that is, the use of resonant metallic structures, has proved particularly useful for optical signal processing, , all-optical switching, − manipulation of emitted higher harmonic light, − optical microscopy, − and surface science. − The reason lies with the nearly free choice of structure shape, size, and orientation, and thus tunability of the resonances, polarization properties, enhancement factors, as well as radiation patterns of the plasmonic excitations. − Apart from the geometrical properties of such nanostructured systems, the used materials are another degree of freedom, in particular, as the nonlinear conversion takes place inside the material volume. − For most applications, the materials used are transparent for the fundamental as well as the converted wavelength, ensuring spectrally flat responses and nearly wavelength-independent conversion efficiencies of the bare material . This is, for example, true in case of frequency doubling in tunable laser systems where broadband operation is required.…”

mentioning

confidence: 99%

Switchable Optical Nonlinearity at the Metal to Insulator Transition in Magnesium Thin Films

et al. 2020

View full text Add to dashboard Cite

We report resonantly enhanced and switchable third order nonlinearity in magnesium thin films. Utilizing an optical parametric oscillator as a tunable broadband light source, we find a highly wavelength dependent third harmonic conversion efficiency, exhibiting a 40-to 50-fold signal increase over the investigated wavelength range between 1300 and 1800 nm. We relate this unusually strong increase of the intrinsic magnesium material nonlinearity to resonant sp-interband transitions around 0.7 eV or 1770 nm in the fundamental wavelength range, multiplying their impact on the conversion efficiencies. Moreover, we make use of the drastic change in the optical properties of magnesium at the phase transition between metallic magnesium and dielectric magnesium hydride by in situ hydrogenation. We are able to cyclically switch the nonlinearity and the efficiency of the third harmonic conversion process. The time-dependence of the nonlinear signal is complex and is a consequence of several contributions, including the hydrogen concentration-dependent change in the intrinsic nonlinear susceptibility, the change in the surface morphology during hydrogenation and dehydrogenation, as well as the volume change of the material. While shedding new light on the structural and morphological changes in such magnesium thin films, we envision that the switchable and large resonant third-order nonlinearity in magnesium will find applications in nanostructured systems, unlocking additional degrees of freedom in design and implementation, such as wavelength dependency and switchable material nonlinearities.

show abstract

“…In both cases, the high refractive index of the prism operated in a regime of total internal reflection provides the large momenta required to excite the surface waves . While mostly employed for studies of SPPs, − a few works also investigated SPhPs with prism coupling in the mid-IR. ,,, Specifically in the Otto configuration, the surface polariton is excited across an air gap of adjustable width, providing contact-free access to the surface mode with extrinsic tunability of the excitation efficiency, which can lead to critical coupling conditions . Strong optical field enhancement at critical coupling was predicted but could not be experimentally confirmed using linear optical techniques.…”

mentioning

confidence: 99%

“…Strong optical field enhancement at critical coupling was predicted but could not be experimentally confirmed using linear optical techniques. Instead, nonlinear-optical approaches such as second-harmonic generation (SHG) are highly sensitive to the localized electromagnetic fields. ,,,− …”

mentioning

confidence: 99%

Second-Harmonic Generation from Critically Coupled Surface Phonon Polaritons

et al. 2017

View full text Add to dashboard Cite

Mid-infrared nanophotonics can be realized using sub-diffractional light localization and field enhancement with surface phonon polaritons in polar dielectric materials. We experimentally demonstrate second harmonic generation due to the optical field enhancement from critically coupled surface phonon polaritons at the 6H-SiC-air interface, employing an infrared freeelectron laser for intense, tunable, and narrowband mid-infrared excitation. Critical coupling to the surface polaritons is achieved using a prism in the Otto geometry with adjustable width of the air gap, providing full control over the excitation conditions along the polariton dispersion. The calculated reflectivity and second harmonic spectra reproduce the full experimental data set with high accuracy, allowing for a quantification of the optical field enhancement. We also reveal the mechanism for low out-coupling efficiency of the second harmonic light in the Otto geometry. Perspectives on surface phonon polariton-based nonlinear sensing and nonlinear waveguide coupling are discussed.

show abstract

Revealing nonlinear plasmon-photon interactions using k-space spectroscopy

Cited by 8 publications

References 0 publications

Plasmonic Metasurfaces for Nonlinear Optics and Quantitative SERS

Plasmonic Metasurfaces for Nonlinear Optics and Quantitative SERS

Switchable Optical Nonlinearity at the Metal to Insulator Transition in Magnesium Thin Films

Second-Harmonic Generation from Critically Coupled Surface Phonon Polaritons

Contact Info

Product

Resources

About