Surface second harmonic generation spectroscopy without interference of substrate contributions

Reider, Georg A.; Huemer, M.; Schmidt, Alexander

doi:10.1016/0030-4018(88)90141-1

Cited by 25 publications

(12 citation statements)

References 4 publications

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“…30͑a͔͒ and Ru͑001͒, 30͑b͒ from which diffusion can be measured using second-harmonic ͑SH͒ optical diffraction. this technique has provided valuable information in several other cases utilizing either second-harmonic 10,14,[31][32][33] or linear diffraction, 12,14,34,35 both of which were demonstrated to be effective in monitoring diffusion on the length scale of micrometers. Monitoring diffusion using SH diffraction is especially effective for alkali metals due to their strong secondharmonic generation ͑SHG͒.…”

Section: Introductionmentioning

confidence: 99%

Interaction and diffusion of potassium onCr2O3(0001)/
Zhao
¹
,
Kerner
²
,
Asscher
³

et al. 2000
Phys. Rev. B
18
1
27
0
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The interaction of potassium atoms on top of Cr 2 O 3 ͑0001͒/Cr͑110͒ has been studied using work-function ͑⌬⌽͒, temperature programmed desorption ͑TPD͒, and optical second-harmonic generation ͑SHG͒ measurements. Potassium grows via the completion of a first layer, followed by a second layer in the form of two-dimensional ͑2D͒ islands, and at higher coverage 3D clusters are formed. This growth model is supported by and consistent with the results obtained from all three methods. Work-function data suggest that annealing at temperatures above 350 K results in the formation of a surface potassium oxide compound, provided the potassium coverage is higher than 0.5 monolayers ͑ML͒. Diffusion of alkali-metal atoms on an oxide surface is reported here over distances of several micrometers. This was measured using optical SH diffraction from coverage gratings that were generated by laser-induced thermal desorption. The activation energy for surface diffusion of potassium on Cr 2 O 3 ͑0001͒/Cr͑110͒ has been determined to be 11Ϯ0.5 kcal/mol with a preexponential factor D 0 ϭ10 5 cm 2 /sec in the coverage range of 1.5-2.5 ML, dropping to 9 kcal/mol and D 0 ϭ3 ϫ10 3 cm 2 /sec at a coverage of 3.0 ML. These results are consistent with the diffusion of atoms in the third layer, on top of two-dimensional potassium islands in the second layer, the activation energy represent the barrier for descending from the 2D islands.

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Section: Introductionmentioning

confidence: 99%

Interaction and diffusion of potassium onCr2O3(0001)/
Zhao
¹
,
Kerner
²
,
Asscher
³

et al. 2000
Phys. Rev. B
18
1
27
0
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“…One key idea in the study of surface nonlinear interactions is that the optical layer interactions should be independent of the substrate . Several optical nonlinear effects from fluorescent or non‐fluorescent chromophores deposited as molecular films have been demonstrated; specifically, the surface nonlinear diffraction . Nonlinear optical interactions allow new and exciting possibilities for applications even when the linear optical response is uninteresting.…”

Section: Introductionmentioning

confidence: 99%

“…Laser induced molecular desorption is based on controlling the heat deposition onto specific regions of organic thin films through the laser intensity. It has been demonstrated with 6 ns frequency doubled mode‐locked Nd:YAG lasers forming an interference pattern, and with 100 mW from a CW krypton laser at 530.9 nm . Electron‐beam lithography is central in nanotechnology because of the level of control that it offers, for total or partial desorption of several types of organic films .…”

Section: Introductionmentioning

confidence: 99%

Surface Nonlinear Gratings by Direct Multiphoton Microscope Writing

Avalos-Hernández

Carriles

Domínguez-Juárez

2017

Physica Status Solidi (b)

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Thin film fabrication and patterning using organic molecules is of interest for technological and optoelectronic applications, among others. We demonstrate a new method to realize surface periodic patterning using femtosecond laser radiation from a multiphoton microscope. The laser is focused on organic films to generate a homogeneous 2D structure on a flat surface. The organic film was deposited onto microscope slides by immersion. From the gratings, the relative position of the nonlinearly diffracted first order maxima of second harmonic generation was measured. It is shown that nonlinear diffraction orders can be manipulated by the characteristics of the surface periodic patterning. It is possible to extend this writing scheme to arbitrary patterns and possibly curved surfaces with potential applications in couplers and waveguides. This method might also be useful to perform selective linear and nonlinear spectroscopy by modulating the linear and nonlinear activity of dyes deposited on the surface of microresonators or similar devices.

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“…Since the first prediction of nonlinear diffraction in spatially modulated systems, 1 the subject of second-harmonic generation (SHG) in diffraction from nonlinear gratings has received much attention both experimentally and theoretically. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] A second-harmonic (SH) beam generated by the nonlinear material and diffracted by the grating occurs at directions given by nonlinear diffraction conditions (if the material is rough, diffracted SHG occurs also in a diffusion cone 1 ). The diffracted SH signal is obviously small for a shallow grating and increases with groove depth.…”

Section: Introductionmentioning

confidence: 99%

Second-harmonic generation in reflection and diffraction by a GaAs photonic-crystal waveguide

et al. 2002

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Nonlinear reflection and diffraction measurements have been performed on a GaAs/AlGaAs photonic-crystal waveguide patterned with a square lattice: The basis in the two-dimensional unit cell consists of rings of air in the dielectric matrix. The measured angles of diffracted second-harmonic beams agree with those predicted for nonlinear diffraction conditions. Results for second-harmonic intensities as a function of incidence angle, polarization, and pump wavelength show that the reflected second-harmonic signal is dominated by the crystalline symmetry of GaAs, whereas nonlinear diffraction is determined by the photonic-crystal structure

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Surface second harmonic generation spectroscopy without interference of substrate contributions

Cited by 25 publications

References 4 publications

Interaction and diffusion of potassium onCr2O3(0001)/
Zhao
¹
,
Kerner
²
,
Asscher
³

et al. 2000
Phys. Rev. B
18
1
27
0
View full text Add to dashboard Cite

Interaction and diffusion of potassium onCr2O3(0001)/
Zhao
¹
,
Kerner
²
,
Asscher
³

et al. 2000
Phys. Rev. B
18
1
27
0
View full text Add to dashboard Cite

Surface Nonlinear Gratings by Direct Multiphoton Microscope Writing

Second-harmonic generation in reflection and diffraction by a GaAs photonic-crystal waveguide

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Surface second harmonic generation spectroscopy without interference of substrate contributions

Cited by 25 publications

References 4 publications

Interaction and diffusion of potassium onCr2O3(0001)/Zhao1, Kerner2, Asscher3 et al. 2000Phys. Rev. B181270View full textAdd to dashboardCite

Interaction and diffusion of potassium onCr2O3(0001)/Zhao1, Kerner2, Asscher3 et al. 2000Phys. Rev. B181270View full textAdd to dashboardCite

Surface Nonlinear Gratings by Direct Multiphoton Microscope Writing

Second-harmonic generation in reflection and diffraction by a GaAs photonic-crystal waveguide

Contact Info

Product

Resources

About

Interaction and diffusion of potassium onCr2O3(0001)/
Zhao
¹
,
Kerner
²
,
Asscher
³

et al. 2000
Phys. Rev. B
18
1
27
0
View full text Add to dashboard Cite

Interaction and diffusion of potassium onCr2O3(0001)/
Zhao
¹
,
Kerner
²
,
Asscher
³

et al. 2000
Phys. Rev. B
18
1
27
0
View full text Add to dashboard Cite