Scientists have developed a new “space-time wave pack” laser beam capable of traveling through different media at the same speed.

The classical physical rules say that light travels at different speeds in different media and is slower in denser materials. In the case of a classic basic experiment, when a spoon is placed in water, the refractive index, which is different from the air, allows us to see the visual effect of the spoon being bent. Snell’s Law points out that this refraction occurs only because light travels more slowly in water than in air.

(From: University of Central Florida)

To our surprise, however, the team at Central University of Florida has developed a new laser beam that goes against classical physics theory.

In addition to the snell’s law of refraction mentioned above, the new study ignores the Fermat’s Principle, which always takes the shortest path for light.

Study illustration – 1: Dynamic refraction of space-time wave packages.

According to Study Ayman Abouraddy, the new laser beam has a unique nature that ordinary laser beams cannot share and is of great significance for optical communication technologies.

Spacetime Wave Packets allows light pulses to travel through different media at the same speed, even at an abnormal rate in denser materials.

Study the method of proofing – 2: The law of refraction of the packet of space-time waves in a step-by-step.

The research team used spacecraft as an example, and when they send optically encoded messages to two submarines with the same depth but different distances, the information usually reaches the nearest subnode first. However, the “space-time wave package” feature allows the light pulse to reach two subnodes “just right” at the same time.

Although this sounds contradicting some of the fundamental laws of physics, the team stresses that it actually follows a narrow relativity. Because this technique does not disturb the oscillation of the light itself (wave particle divity), but controls the peak transmission speed of the light pulse.

Study illustration – 3: The law of refraction is confirmed.

To achieve this, the team used a device called the Spatial Light Modulator to intercombine its characteristics in space and time.

Study co-author Basanta Bhaduri added: “Space-time refraction (Space-time Refraction) goes against our expectations of the Ferma theorem, but creates new opportunities for the shaping of light flows and other fluctuations.”

Study Illustration – 4: Refraction of space-time wave packages in oblique incident.

Details of the study have been published in the recently published journal Fermat’s Principle.

Originally titled “Anomalous re of optical spacetime wave packets.”