Minimizing dc drift in LiNbO3 waveguide devices

Gee, C. M.; Thurmond, G. D.; Blauvelt, H.; Yen, H. W.

doi:10.1063/1.96220

Cited by 50 publications

(14 citation statements)

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“…2 (b) and the dips in Figs. 2(c) and 2(d) is attributed to dc drift associated with the buffer layer (SiO 2 ) [26,27]. Here the dc drift has been depressed a lot by etching a groove on the SiO 2 buffer layer as shown in the inset of Fig.…”

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confidence: 97%

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On-Chip Generation and Manipulation of Entangled Photons Based on Reconfigurable Lithium-Niobate Waveguide Circuits

et al. 2014

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A consequent tendency toward high-performance quantum information processing is to develop the fully integrated photonic chip. Here, we report the on-chip generation and manipulation of entangled photons based on reconfigurable lithium-niobate waveguide circuits. By introducing a periodically poled structure into the waveguide circuits, two individual photon-pair sources with a controllable electro-optic phase shift are produced within a Hong-Ou-Mandel interferometer, resulting in a deterministically separated identical photon pair. The state is characterized by 92.9±0.9% visibility Hong-Ou-Mandel interference. The photon flux reaches ∼1.4×10(7) pairs nm-1 mW-1. The whole chip is designed to contain nine similar units to produce identical photon pairs spanning the telecom C and L band by the flexible engineering of nonlinearity. Our work presents a scenario for on-chip engineering of different photon sources and paves the way to fully integrated quantum technologies.

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confidence: 97%

“…1(a). The dc drift can be further minimized by replacing SiO 2 with a transparent conductive buffer layer such as indium tin oxide [27].…”

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confidence: 99%

On-Chip Generation and Manipulation of Entangled Photons Based on Reconfigurable Lithium-Niobate Waveguide Circuits

et al. 2014

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“…1. objectives (6). The introduction of a prismatic glass plate (5) in front of the input objective ensures the simultaneous excitation of two neighbouring channel waveguides.…”

Section: Methodsmentioning

confidence: 99%

<title>Stability problems of LiNbO<formula><inf><roman>3</roman></inf></formula> waveguide components for interferometric applications in the visible and near-infrared regions</title>

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Rasch

Karthe

et al. 1993

Integrated Optical Circuits II

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Optical phase drifts of guided waves in LiNbO3 waveguides can be caused by two different physical effects: light-induced refractive index changes (photorefractive effect) and so-called DC drift effects. Both phenomena have been investigated experimentally by a special interferometric technique on simple channel waveguides with very high accuracy. Light-induced refractive index changes were measured at 633 nm wavelength and in the 800 nm region. These index changes in annealed proton exchanged (APE) waveguides are about one order of magnitude smaller compared to titanium indiffused(TI). This can be explained by an increased photoconductivity of the APE material. DC drift effects in APE waveguides, however, are quite large and cannot be reduced in the same way as for TI waveguides. This is due to an ionic charge transport process. MgO doping of the waveguide substrates leads to a considerable reduction of both the photorefractive effect and the DC drifts of APE waveguides. The influence of both drift effects on the stability of a three-beam interferometric displacement sensor was demonstrated.

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“…Several attempts have been made to eliminate or suppress DC-drift effects, e.g. by sputter etching the surface of the LiNbO3 sample [33J, by using a conducting silicon buffer layer [34] or by using the transparent but conducting indium tin oxide (ITO) material as buffer layer or directly as electrode material [35,36]. These means have shown satisfactory results, as far as crosstalk levels of about -20 dB are tolerable.…”

Section: <0010mentioning

confidence: 98%