New atomic clocks are more accurate than those used to define the second, suggesting the definition might need to change ...

Laser diodes are semiconductors that generate light and amplify it using repeated reflection or "optical feedback." Once the ...

For the first time, scientists have demonstrated that negative refraction can be achieved using atomic arrays—without the ...

从古埃及的日晷到现代的原子钟，人类对时间测量的精度不断提升。而如今，光学钟的精确度已超越了当前以铯-133原子跃迁定义的“秒”。这引发了一个关键问题：我们是否应该重新定义时间的基本单位？本文将系统解析当前时间计量的框架、光学钟的革命性突破，以及重新定 ...

A research team at POSTECH has developed a novel multidimensional sampling theory to overcome the limitations of flat optics. Their study not only identifies the constraints of conventional sampling ...

Scientists have found a way to achieve negative refraction—where light bends the "wrong" way—using carefully arranged atomic ...

Scientists have demonstrated that negative refraction can be achieved using atomic arrays -- without the need for artificially manufactured metamaterials. Scientists have long sought to control light ...

For the first time, scientists have demonstrated that negative refraction can be achieved using atomic arrays.

Researchers developed a numerical simulation technique for light wave interactions in triangular-lattice PCSELs, enhancing ...

Photonic crystal surface-emitting lasers or PCSELs are laser diodes that generate laser beams through controlled light wave interaction within a photonic crystal structure. In a recent study, ...