Anomalous second harmonic generation in BaTiO3 thin films

Rotter, L. D.; Kaiser, Debra L.; Vaudin, Mark D.

doi:10.1063/1.116069

Cited by 25 publications

(6 citation statements)

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“…The surface nature of this SHG, in combination with strong photorefractivity of BaTiO 3 leads to quite peculiar angular and orientational behavior of the SH light intensity. We believe that our observations performed in a well controlled geometry may clarify a lot of questions concerning still unclear anomalous" SHG in BaTiO 3 reported recently by a number of groups [8,9]. This is especially important for the rapidly developing field of ferroelectric oxide film growth and characterization.…”

supporting

confidence: 58%

“…Much recent effort in this field is caused by the applications of these films in nonvolatile ferroelectric random-access memory (NVFRAM) and dynamic random-access memory (DRAM) devices [10]. SHG has been used to determine the crystallographic orientation and the degree of poling of these films (in particular, BaTiO 3 films in [9]). Our experimental geometry is shown in Fig.1.…”

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confidence: 99%

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Giant Enhancement of Surface Second Harmonic Generation inBaTiO3due to Photorefractive Surface Wave Excitation

1999

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We report observation of strongly enhanced surface SHG in BaTiO3 due to excitation of a photorefractive surface electromagnetic wave. Surface SH intensity may reach 10 −2 of the incident fundamental light intensity. Angular, crystal orientation, and polarization dependencies of this SHG are presented. Possible applications of this effect in nonlinear surface spectroscopy are discussed. PACS no.: 42.65. Ky; 42.65.Tg; 42.70.Nq. Linear surface electromagnetic waves (SEW) such as surface plasmons or surface polaritons [1] play a very important role in such surface optical phenomena as surface enhanced Raman scattering, surface second harmonic generation (SHG), etc. They are extremely useful in applications such as chemical and biological sensing since the electromagnetic field of a SEW is strongly enhanced near the interface. A linear SEW may be excited at the interface between media with opposite signs for their dielectric constants ǫ, such as at a metal-vacuum interface. Another example is the interface between a vacuum and a dielectric that has a sharp absorption line. Such a dielectric has ǫ(ω) < 0 for frequencies just above the absorption line. In both cases the SEW free propagation length in the visible range does not exceed a few micrometers because of high losses [1]. This limits the potential advantages of using SEW in surface enhanced nonlinear optical studies and sensor applications.Recently, a new kind of nonlinear SEW called a photorefractive surface wave has been predicted [2] and observed experimentally [3] in BaTiO 3 . This phenomenon is closely related to self-trapped optical beams (also known as spatial solitons) and self-bending beams observed in photorefractive crystals [4]. A photorefractive SEW occurs when a beam self-bent towards the positive direction of the optical axis (the poling direction) undergoes a cycle of deflections towards the face of the crystal and total internal reflections. The resulting nonlinear SEW is localized near the crystal-air interface with a penetration depth as small as 10 micrometers into the photorefractive crystal [2]. This leads to a strong enhancement of the optical field near the interface that is common for all SEWs. On the other hand, since BaTiO 3 is transparent in the visible range, the free propagation length of the photorefractive SEW along the surface is limited only by the size of the crystal. As a result, a very strong enhancement of all nonlinear surface optical phenomena (such as surface adsorbed molecular luminescence, Raman scattering, surface SHG, etc.) may be expected due to photorefractive SEW excitation. This effect may also be used in combination with further field enhancements produced by surface topographical defects or by the probe tip of a scanning probe microscope (the field enhancement by a probe tip is discussed in the context of a feasibility study of molecular resolution fluorescence near-field microscopy using multi-photon absorption by Kawata et al. [5]).In this letter we report the first observation of strongly enhanced surface ...

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Giant Enhancement of Surface Second Harmonic Generation inBaTiO3due to Photorefractive Surface Wave Excitation

1999

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“…The methods of determination of domain configuration for in-plane uncompensated domains by SHG polarization measurements are given in Refs. [3][4]. In Ref.…”

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confidence: 97%

Polarization Switching in Ferroelectric Thin Films Studied by Optical Second Harmonic Generation

Мишина

Sherstyuk

Golovko

et al. 2007

Integrated Ferroelectrics

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“…Further, the authors of [5,6] similarly investigated BiFeO 3 and NaNO 2 single crystals. In addition, we know reports [7][8][9] on the investigation of the SOH generation in single crystal films and ceramics. The question of increasing the efficiency of the SOH localized in a thin subsurface layer of ferroelectrics was also considered in [10,11], where the clusters of barium titanate nanoparticles were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…(a) SOH spectrum in sodium nitrite microcrystals under exciting radiation power P = 0.252 W and (b) sec ondary radiation spectra(1)(2)(3)(4)(5)(6)(7)(8) in a photonic crystal with sodium nitrite under the excitation with femtosecond pulse periodic laser radiation (λ = 1026 nm) at various pumping powers in a range of 0.06-3.5 W as well as the plasma spectrum (9) under the air breakdown. Arrows denote exciting radiation wavelengths for the second and third optical harmonics.…”

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Second optical harmonic near the surface of ferroelectric photonic crystals and photon traps

et al. 2015

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Anomalous second harmonic generation in BaTiO3 thin films

Abstract: Structural study and ferroelectricity of epitaxial BaTiO3 films on silicon grown by molecular beam epitaxy

Cited by 25 publications

References 8 publications

Giant Enhancement of Surface Second Harmonic Generation inBaTiO3due to Photorefractive Surface Wave Excitation

Giant Enhancement of Surface Second Harmonic Generation inBaTiO3due to Photorefractive Surface Wave Excitation

Polarization Switching in Ferroelectric Thin Films Studied by Optical Second Harmonic Generation

Second optical harmonic near the surface of ferroelectric photonic crystals and photon traps

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