Non-ideal quarter-wavelength Bragg-reflection waveguides for nonlinear interaction: eigen equation and tolerance

Yang, Quankui; Passow, T.

doi:10.1364/ol.397198

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…The BRW simulations were performed by COMSOL for the TE and TM total internal reflection (TIR) modes at 1550 nm (frequency ) and the TE Bragg mode at 775 nm (frequency 2), respectively. We used the structure optimized for a 4.4 µm ridge width proposed earlier as a starting point using the same material parameters [19].…”

Section: Brw Simulations and Fabricationmentioning

confidence: 99%

Optimization of AlGaAs-based Bragg-reflection waveguides for entangled photon sources

Passow,

Yang,

Leidel

et al. 2024

Quantum Technologies 2024

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AlGaAs Bragg-reflection waveguides offer the potential for on-chip entangled photon sources which integrate the entangled photon source and the pump source in the same chip. We designed and experimentally realized an AlGaAs Bragg-reflection waveguide structure in which the effective refractive indices for TE and TM polarized down converted photons are the same to improve the degree of entanglement without external compensation. This was realized by appropriate choice of the ridge width of 1.8 µm, which offers lateral optical confinement. The difference in effective refractive indices has been reduced by more than a factor of 10 compared to waveguides of several micron width. Photon generation rates of 9,200,000 cps (single rates) and 1,700,000 cps (coincidence rate) and a coincidence accidence ratio of about 60 were determined for these waveguides for 5 mW pump power.

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Section: Brw Simulations and Fabricationmentioning

confidence: 99%

Optimization of AlGaAs-based Bragg-reflection waveguides for entangled photon sources

Passow,

Yang,

Leidel

et al. 2024

Quantum Technologies 2024

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“…The SPDC process requires fulfilling the phase matching condition. For BRWs, this is obtained by choosing a vertical layer structure where the effective refractive indices of the mode for the pump light (a so-called Bragg mode) and the modes for the down converted photons (total internal reflection modes, TIR) are the same [15,16]. In addition, the result is also influenced by the ridge width and depth which define the lateral optical confinement in the waveguide.…”

Section: Samplesmentioning

confidence: 99%

Advances in entangled-photon sources and single-photon avalanche diodes for quantum technologies in the SWIR

Rutz,

Passow,

Wörl

et al. 2024

Advanced Photon Counting Techniques XVIII

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Quantum sensing and quantum communication systems rely on high-performance single-or entangled-photon sources and single-photon detectors enabling experiments based on the quantum nature of single photons. In this contribution, we discuss the development of an entangled-photon source delivering entangled photon pairs with wavelengths of about 1550 nm alongside with single-photon avalanche detectors (SPADs) for the short-wave infrared (SWIR) and for the extended SWIR (eSWIR) spectral range.The fabrication processes of such quantum-enabling technologies is highlighted. The entangled-photon source is based on AlGaAs Bragg-reflection waveguides. Very low difference in effective refractive index of TE and TM polarized photons -important for high polarization entanglement without external compensation -as well as high single and coincidence count rates were achieved. For the fabrication of InGaAs/InP SWIR SPADs, the key technology is the planar process technology via zinc diffusion to produce spatially confined p-type regions. For the zinc-diffusion process, a novel method of selective epitaxial overgrowth was developed, achieving the intended double-well diffusion profile. Experimental data of thus fabricated InGaAs/InP SPADs show the expected dark-current, photo-current, and multiplication-gain characteristics in linear-mode operation as well as breakthrough behavior in Geiger-mode operation at 240 K, which is a typical operating temperature for InGaAs/InP SPADs achievable by thermoelectric cooling. GaSb-based SPADs for the eSWIR are fabricated in a mesa approach showing the expected dark current behavior as well. All three different devices are linked by enabling quantum technologies in the (e)SWIR as well as by using our III/V-semiconductor technology facilities.

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“…The aggregated structure corresponds to the fiber structure tested by cryo-TEM. thicknesses could not be calculated directly using the Bragg equation [47][48][49]. Instead, the generalized indirect Fourier transformation (GIFT) method was adopted to determine the single wall thickness of the tubes [49,50].…”

Section: The Gelation Mechanism Of Supramolecular Hydrogelsmentioning

confidence: 99%

Facile Construction of Bio-Based Supramolecular Hydrogels from Dehydroabietic Acid with a Tricyclic Hydrophenanthrene Skeleton and Stabilized Gel Emulsions

Lin

Tang

et al. 2021

Molecules

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Supramolecular hydrogels have attracted great attention due to their special properties. In this research, bio-based supramolecular hydrogels were conveniently constructed by heating and ultrasounding two components of dehydroabietic acid with a rigid tricyclic hydrophenanthrene skeleton and morpholine. The microstructures and properties of hydrogels were investigated by DSC, rheology, SAXS, CD spectroscopy, and cryo-TEM, respectively. The critical gel concentration (CGC) of the hydrogel was 0.3 mol·L−1 and the gel temperature was 115 °C. In addition, the hydrogel showed good stability and mechanical properties according to rheology results. Cryo-TEM images reveal that the microstructure of hydrogel is fibrous meshes; its corresponding mechanism has been studied using FT-IR spectra. Additionally, oil-in-water gel emulsions were prepared by the hydrogel at a concentration above its CGC, and the oil mass fraction of the oil-in-water gel emulsions could be freely adjusted between 5% and 70%. This work provides a convenient way to prepare bio-based supramolecular hydrogels and provides a new method for the application of rosin.

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Non-ideal quarter-wavelength Bragg-reflection waveguides for nonlinear interaction: eigen equation and tolerance

Cited by 7 publications

References 27 publications

Optimization of AlGaAs-based Bragg-reflection waveguides for entangled photon sources

Optimization of AlGaAs-based Bragg-reflection waveguides for entangled photon sources

Advances in entangled-photon sources and single-photon avalanche diodes for quantum technologies in the SWIR

Facile Construction of Bio-Based Supramolecular Hydrogels from Dehydroabietic Acid with a Tricyclic Hydrophenanthrene Skeleton and Stabilized Gel Emulsions

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