2D passive optical beam-steering module with 7 scan lines within 12.2°×5.6° for free-space indoor communication

We experimentally demonstrate a two-dimensional (2D) passive optical beam-steering module constructed using reflection and transmission gratings for angular coverage of 12.2°×5.6° with seven scanning lines. We vigorously evaluate the 2D beam-steered system with OOK, 4-PAM and DMT transmission.</p

2D passive optical beam-steering module with 7 scan lines within 12.2°×5.6° for free-space indoor communication

We experimentally demonstrate a two-dimensional (2D) passive optical beam-steering module constructed using reflection and transmission gratings for angular coverage of 12.2°×5.6° with seven scanning lines. We vigorously evaluate the 2D beam-steered system with OOK, 4-PAM and DMT transmission.</p

Environmental 24-hr Cycles Are Essential for Health

Circadian rhythms are deeply rooted in the biology of virtually all organisms. The pervasive use of artificial lighting in modern society disrupts circadian rhythms and can be detrimental to our health. To investigate the relationship between disrupting circadian rhythmicity and disease, we exposed mice to continuous light (LL) for 24 weeks and measured several major health parameters. Long-term neuronal recordings revealed that 24 weeks of LL reduced rhythmicity in the central circadian pacemaker of the suprachiasmatic nucleus (SCN) by 70%. Strikingly, LL exposure also reduced skeletal muscle function (forelimb grip strength, wire hanging duration, and grid hanging duration), caused trabecular bone deterioration, and induced a transient pro-inflammatory state. After the mice were returned to a standard light-dark cycle, the SCN neurons rapidly recovered their normal high-amplitude rhythm, and the aforementioned health parameters returned to normal. These findings strongly suggest that a disrupted circadian rhythm reversibly induces detrimental effects on multiple biological processes