Enlightening Arago-Poisson spot using structured light.

We show that structured light can amplify the intensity of an Arago-Poisson bright spot, the cornerstone proof of the wave nature of light, by several orders of magnitude. Specifically, we use a thin annular beam produced by either an axicon-lens combination or two axicons to illuminate an opaque circular obstacle. Experimental results confirm the numerical calculations.

Paediatric chronic fatigue syndrome patients' and parents' perceptions of recovery.

Objectives: Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) is common in children and adolescents; however, little is known about how we should define recovery. This study aims to explore perceptions of recovery held by paediatric patients with CFS/ME and their parents.

Methods: Children with CFS/ME and their parents were recruited through a single specialist paediatric CFS/ME service.