Metals have been formed into nanostructures to absorb light with high efficiency through surface plasmon resonances. An ultra-thin plasmonic structure that exhibits strong absorption over wide ranges of wavelengths and angles of incidence is sought. In this work, a nearly perfect plasmonic nanostructure is fabricated using glancing angle deposition. The difference between the morphologies of obliquely deposited aluminum and silver nanohelices is exploited to form a novel three-dimensional structure, which is an aluminum-silver nanohelix array on a pattern-free substrate. With a thickness of only 470 nm, densely distributed nanohelices support rod-to-rod localized surface plasmons for broadband and polarization-independent light extinction. The extinctance remains high over wavelengths from 400 nm to 2000 nm and angles of incidence from 0° to 70°.

Silver nanohelices were grown on smooth substrates using glancing angle deposition and substrate cooling. Various nanohelix arrays were deposited under different deposition conditions-different deposition rates, substrate spin rates, deposition angles, and substrate temperatures. The effect of deposition conditions on the morphology of each nanohelix array in terms of pitch angle, pitch length, wire diameter, and radius of curvature was investigated. The dependence of circular dichroism on the size of the nanohelix arrays was also measured and demonstrated.

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Introduction: Excessive intake of oil, salt and sugar is closely associated with the prevalence of NCDs. Canteen staff’s knowledge, attitude and practice (KAP) about oil, salt and sugar directly affect the content of them in dishes and the consumers’ intake. However, there is no valid questionnaire used to assess KAP among canteen staff about the “oil, salt and sugar”. Therefore, the aim of the present study was to establish and validate a questionnaire to evaluate the KAP of canteen staff about the “oil, salt and sugar”. Methods: A total of 100 canteen staff randomly selected from three different college canteens in Shandong Province. Participants completed the questionnaire and retested 1 month later. Internal reliability and test-retest reliabilitywere assessed using Cronbach’s α and Pearson correlation coefficients, respectively. Validity was assessed using the exploratory factor analysis. Results: A total of 100 participants finished the questionnaire of which 66% were females with a mean age of 40.3 years. The Cronbach’s α coefficients of the questionnaire and each dimension were 0.822, 0.830, 0.752 and 0.700, respectively. The test-retest reliability coefficient is 0.968; In exploratory factor analysis, 9 common factors are extracted, with a total of 26 items, and the cumulative contribution rate is 70.923%. Conclusions: The questionnaire had asatisfactory property for measuring the KAP of the “oil, salt and sugar” among canteen staff in China.