Circularly polarized light is utilized in various optical techniques and devices. However, using conventional optical systems to generate, analyse and detect circularly polarized light involves multiple optical elements, making it challenging to realize miniature and integrated devices. While a number of ultracompact optical elements for manipulating circularly polarized light have recently been demonstrated, the development of an efficient and highly selective circularly polarized light photodetector remains challenging. Here we report on an ultracompact circularly polarized light detector that combines large engineered chirality, realized using chiral plasmonic metamaterials, with hot electron injection. We demonstrate the detector's ability to distinguish between left and right hand circularly polarized light without the use of additional optical elements. Implementation of this photodetector could lead to enhanced security in fibre and free-space communication, as well as emission, imaging and sensing applications for circularly polarized light using a highly integrated photonic platform.
Varios autores han destacado que la población universitaria es un grupo caracteriza por omitir comidas con frecuencia y realizar reiteradas ingestas entre las comidas principales, también su dieta se ve influenciada por una mayor independencia, la influencia de determinados hábitos sociales, su mayor disponibilidad de dinero que posibilita un gasto propio independiente, la oferta de restaurantes de comidas rápidas y la disponibilidad de alimentos precocinados para consumir en casa. Por lo que se trata de un periodo de educación crítico para el desarrollo de hábitos dietéticos que tienen mucha importancia en el estado de salud futuro. Los países de Latinoamérica, están experimentando un fenómeno que se conoce como transición nutricional, asociado al rápido proceso de urbanización y cambios económicos donde estas transiciones implican cambios en el patrón alimentario. Mostrándose que el tener conocimientos de nutrición, no influye en la toma de decisiones para una alimentación y estilo de vida saludables. La Federación de las Naciones Unidas para la Agricultura y la Alimentación (FAO) recomienda una ingesta calórica no mayor a 2000Kcal/día.
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