Fast, reconfigurable light-induced waveguides

Dittrich, Ph.; Montemezzani, Germano; Bernasconi, P.; Günter, Peter

doi:10.1364/ol.24.001508

Cited by 48 publications

(21 citation statements)

References 9 publications

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“…This first control wave is responsible for the creation of the 1D, planar like, waveguides as in Refs. [3,4]. The control beam 2 is present only for the investigation of 2D-confined waveguides.…”

Section: Set-up and Crystal Samplesmentioning

confidence: 99%

“…With respect to soliton-based ones, waveguides induced by lateral illumination bear the advantage of a major versatility [3][4][5], because their form can be easily designed according to the shape of the side illumination. Due to the superior response speed, past investigations of laterally illuminated dynamic light-induced waveguides [3,4] were performed by taking advantage of the interband photorefractive effect [6], connected to band-to-band carrier phototransitions. This physical process is connected with a strong absorption of the waveguide-inducing control light.…”

Section: Introductionmentioning

confidence: 99%

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Reconfigurable One and Two Dimensional Waveguides in Strontium Barium Niobate Induced by Lateral Illumination

et al. 2009

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Photoinduced waveguides are generated by lateral illumination of photorefractive strontium barium niobate. The light-induced waveguides show a complex dynamic relaxation upon removal of the sustaining voltage, which can be exploited for deflecting or modulating the guided wave. The deflection distance easily exceeds 100 µm in a 1 cm long crystal. The observed dynamics agrees with the predictions of numerical calculations of the beam propagation under the appropriate relaxation of the refractive index distribution. We also present a novel method to confine in the second transverse direction the otherwise intrinsically one-dimensional photoinduced waveguides. Dynamic channel waveguides in the bulk of the material are demonstrated in this way.

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Section: Set-up and Crystal Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reconfigurable One and Two Dimensional Waveguides in Strontium Barium Niobate Induced by Lateral Illumination

et al. 2009

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“…Several kinds of nonlinear plasmonic structures have been proposed. For instance, efficient SHG has been presented in plasmonic slot waveguides (PSW) [21], long-range plasmonic waveguides [22], hybrid plasmonic waveguides (HPW) [23], metal surfaces with nanoscale roughness [24], individual metallic nanoaperture [25], plasmonic particle chains [26] and plasmonic core-shell nanowires [27]. To date, the most used nonlinear material in these structures to realize SHG is lithium niobate (LiNbO 3 ) [16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Second Harmonic Generation in Asymmetric Metal-Insulator-Metal Plasmonic Waveguides

2015

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In this study, the second harmonic generation in metal-insulator-metal (MIM) plasmonic waveguides was investigated for both symmetric and asymmetric structures. Nonlinear processes such as second harmonic generation (SHG) are important for applications such as switching and wavelength conversion. In this study, it was shown that field enhancement in asymmetric metal-insulator-metal waveguides can result in large enhancement of SHG. Thus, a structure consisting of a MIM waveguide filled with lithium niobate and sandwiched between two same metals was first considered in this study. Thereafter, two different metals on both sides of the waveguide were used. It was shown in this study that this asymmetric device results in more than two orders of magnitude enhancement in SHG compared to a uniform slab of lithium niobate. For such structures, the field enhancement is due to the squeezing of the optical power from the wavelengthsized dielectric waveguide to the deep sub-wavelength MIM waveguide. So, the novelty of this paper is proposing a metalLiNbO3-metal nanostructure with different top and bottom metals as plasmonic waveguides. Two different metals, gold and silver, are used as the metals of plasmonic waveguides, and the SHG is investigated in different structures. The interaction between interfering surface plasmonic polariton modes is studied. It is found that compared to the conventional symmetric metal-insulator-metal plasmonic waveguides, the asymmetric structure with different metals, silver-LiNbO 3 -gold, has higher SHG and longer propagation distance.

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“…Also holographic applications based on the interband photorefractive effect such as multiple quantum well devices [2,3], incoherent-to-coherent optical converters [4], light-induced waveguides [5], high-frame-rate joint Fourier-transform correlators [6] and dynamically reconfigurable wavelength filters [7], operate beyond the absorption edge with absorption constants up to 10 3 cm −1 . In this region, the absorption constant is not easily measured, but is nevertheless of crucial importance for the underlying basic physical mechanisms and the applications.…”

Section: Introductionmentioning

confidence: 99%

Determination of the absorption constant in the interband region by photocurrent measurements

et al. 2006

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We determined high absorption constants of crystals from photocurrent measurements within the interband absorption region (10-10 4 cm −1 ). The method has been demonstrated in the interband absorption regime near 530 nm in Sn 2 P 2 S 6 , a novel infrared sensitive photorefractive material, and in the interband absorption regime near 257 nm of near stoichiometric LiTaO 3 . Besides the verification of older measurements with our new technique, precise absorption data for Sn 2 P 2 S 6 in the wavelength range 488-514 nm are presented. Light emitting diodes, photodetectors, electroabsorption modulators [1], solar cells and many other photonic devices involve transitions of charges between bands, and thus work in a region of high light absorption. Also holographic applications based on the interband photorefractive effect such as multiple quantum well devices [2,3], incoherent-to-coherent optical converters [4], light-induced waveguides [5], high-frame-rate joint Fourier-transform correlators [6] and dynamically reconfigurable wavelength filters [7], operate beyond the absorption edge with absorption constants up to 10 3 cm −1 . In this region, the absorption constant is not easily measured, but is nevertheless of crucial importance for the underlying basic physical mechanisms and the applications.The most common technique for measuring absorption constants in the order of 10-10 4 cm −1 is a direct measurement of the transmission of a thin sample. This method is quite precise but often requires a thin plate of only a few µm thickness.If the light at the wavelength of interest induces a secondary physical effect, it is possible to determine the absorption constant indirectly by a scanning method. For example,

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Fast, reconfigurable light-induced waveguides

Cited by 48 publications

References 9 publications

Reconfigurable One and Two Dimensional Waveguides in Strontium Barium Niobate Induced by Lateral Illumination

Reconfigurable One and Two Dimensional Waveguides in Strontium Barium Niobate Induced by Lateral Illumination

Investigation of Second Harmonic Generation in Asymmetric Metal-Insulator-Metal Plasmonic Waveguides

Determination of the absorption constant in the interband region by photocurrent measurements

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