Scaling optical computing in synthetic frequency dimension using integrated cavity acousto-optics

Optical computing with integrated photonics brings a pivotal paradigm shift to data-intensive computing technologies. However, the scaling of on-chip photonic architectures using spatially distributed schemes faces the challenge imposed by the fundamental limit of integration density. Synthetic dimensions of light offer the opportunity to extend the length of operand vectors within a single photonic component. Here, we show that large-scale, complex-valued matrix-vector multiplications on synthetic frequency lattices can be performed using an ultra-efficient, silicon-based nanophotonic cavity acousto-optic modulator. By harnessing the resonantly enhanced strong electro-optomechanical coupling, we achieve, in a single such modulator, the full-range phase-coherent frequency conversions across the entire synthetic lattice, which constitute a fully connected linear computing layer. Our demonstrations open up the route towards the experimental realizations of frequency-domain integrated optical computing systems simultaneously featuring very large-scale data processing and small device footprints.Comment: 4 figures, 14 pages for main text, 14 pages of supplementary material

Organoaluminium complexes of ortho-, meta-, para-anisidines: synthesis, structural studies and ROP of ε-caprolactone (and rac-lactide)

Reaction of Me₃Al (two equivalents) with ortho-, meta- or para-anisidine, (OMe)(NH₂)C₆H₄, affords the complexes {[1,2-(OMe),NC₆H₄(μ-Me₂Al)](μ-Me₂Al)}₂ (1), [1,3-(Me₃AlOMe),NHC₆H₄(μ-Me₂Al)]2 (2) or [1,4-(Me₃AlOMe),NHC₆H₄(μ-Me₂Al)]₂ (3), respectively. The molecular structures of 1–3 have been determined and all three complexes were found to be highly active for the ring opening polymerization (ROP) of ε-caprolactone. 1 was found highly active either with or without benzyl alcohol present; at various temperatures, the activity order 1 > 2 ≈ 3 was observed. For the ROP of rac-lactide results for 1–3 were poor

Helping Students Learn through Students Feedback Literacy Method

Feedback is the critical element to improve students’ learning quality. During the ten years, many papers have focused on the students’ feedback literacy (SFL) and teachers’ feedback literacy (TFL). This article aims to systematize the core research concept of different teams and suggest strategies for training SFL. For the qualitative method, the researchers interviewed 26 teachers from two vocational colleges in China. For the quantitative method, the authors analyzed 523 students’ data and questionnaires to determine whether there is significant difference between them. Although there is no significant difference the two college between the south and north part of China, using feedback effectively is an important life skill required to function effectively in the workplace and relationships. We summarize crucial ideas about designing effective feedback strategies throughout the paper. With this in mind, we invite readers to consider what small changes you would make to your practice and how you would share your learning with your colleagues and students.