RESUMO
Numerical studies on a graded negative index lens made by a slab of graded photonic crystal (PC) are reported. The graded negative index lens is capable of focusing plane waves and can also be made highly insensitive to frequency, enabling broadband negative index imaging. We provide a simple model for the graded PC lens and predict its superior focusing properties such as low chromatic aberrations and broadband operation. Those properties were also confirmed and analyzed by the finite-difference time-domain simulations. We believe the negative index graded PCs will expand the utility of PC lenses and enable new applications in optoelectronic systems.
Assuntos
Desenho Assistido por Computador , Lentes , Modelos Teóricos , Refratometria/instrumentação , Simulação por Computador , Cristalização , Desenho de Equipamento , Análise de Falha de Equipamento , Luz , Fótons , Espalhamento de RadiaçãoRESUMO
Vulvodynia is a chronic pain syndrome affecting up to 18% of the female population. Despite its high prevalence and associated distress, the etiology, diagnosis and clinical management of the disorder have not been clearly delineated. This "white paper" describes the findings and recommendations of a consensus conference panel based on a comprehensive review of the published literature on vulvodynia in addition to expert presentations on research findings and clinical management approaches. The consensus panel also identified key topics and issues forfurther research, including the role of inflammatory mechanisms and genetic factors and psychosexual contributors.
