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Atomic configurations of superlattices of an organometal halide perovskite layer composed of a mixture of tetragonal and cubic phases are reported by Tae Woong Kim, Satoshi Uchida, Hiroshi Segawa, and co‐workers in article number 1705230. The tetragonal and cubic phases are found to coexist at room temperature, and superlattices composed of a mixture of tetragonal and cubic phases are found to be...
Organometal halide perovskites have attracted widespread attention as the most favorable prospective material for photovoltaic technology because of their high photoinduced charge separation and carrier transport performance. However, the microstructural aspects within the organometal halide perovskite are still unknown, even though it belongs to a crystal system. Here direct observation of the microstructure...
For decades, host-guest nonlinear optical (NLO) polymers have been studied because of their versatilities. NLO polymers do not display second-order nonlinearities in as-prepared conditions because the guest chromophores are randomly oriented in the host polymers and they are centro-symmetric. We report non-electrical poling behaviors of push-pull guest chromophores that consist of a π-conjugated phenylene...
GaAs/AlGaAs waveguides with periodical spatial-inversion structures are expected to function as efficient quasi-phase-matching wavelength conversion devices. To further increase conversion efficiencies, introduction of current injection is promising because optical gain due to spontaneous interband emission can compensate propagation losses and thus leads to higher efficiencies. We have successfully...
We have achieved the lowest propagation loss of 1.3 dB/cm in a quasi-phase-matched GaAs/AlGaAs waveguide by optimizing MBE growth temperature. An expected normalized conversion efficiency of the waveguide will exceed that of a PPLN waveguide.
We have investigated a quasi-phase-matching AlGaAs waveguide using cathodoluminescence spectroscopy and atomic force microscopy. We found that the anisotropic diffusion of Al/Ga atoms causes Al-composition modulation as well as interface corrugations.
We propose a novel wavelength conversion device based on hybrid modal phase matching and quasi phase matching in combined straight and bent waveguides with the laterally inverted core structure. Numerical simulations revealed that conversion efficiency as high as 27500 %/W is attainable for 1.55-/im SHG in a 32-mm-long AlGaAs/SiO2 rib waveguide that can be folded up into a 1.6-mm × 84 /m domain.
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