Laser diodes are semiconductors that generate light and amplify it using repeated reflection or 'optical feedback'. Once the light has achieved desirable optical gain, laser diodes release it as ...
The phase and the group velocity of light propagating in conventional optical media cannot exceed the speed of light in vacuum. However, in so-called epsilon-near-zero (ENZ) materials, light exhibits ...
Sure, there are many plants you can start from seeds, from little annuals to giant trees. But, there are others that are better propagated using other methods.