# Applying directed energy to photons

• Xilor
Gravitational lensing occurs when the light from a distant object is bent and magnified by the gravity of a foreground object. So if energy is applied to a photon, would it change its path and would this change the amount of light that is seen? It is theoretically possible for energy to be applied to a photon and cause it to change its path, but this has never been observed in practice.

#### Xilor

What would happen if energy would be applied to a photon in some direction? Since photons always travel at c, it shouldn't change their velocity no matter from what direction the energy would come, but what does applying energy do?
I could imagine that if you applied energy from the front that the photon would lose some of its energy, and that if energy is applied to the back that some energy is given to the photon. But what happens if you apply energy from the sides, does the path of the photon change?

Or is just impossible to apply energy making this a stupid question?

It is impossible to "apply energy", but that doesn't make it a stupid question. We can ask what can be done to a photon to modify its energy. The answer that will probably be closest to your question is to discuss how a photon acts in a gravitational field:

In General Relativity, gravity is not a force, but a curvature of space. A photon traveling in a straight line in curved space appears to our eyes to take a curved path around massive objects. And if traveling toward or away from a massive object, the photon's energy will increase (toward) or decrease (away) due to what is called gravitational redshift (can also be blueshift, but we don't see that often). And this happens without a change in speed.

So to our eyes, a photon can be accelerated by curving its path, changing its velocity, but it can't have its speed changed (remember, speed and velocity are not the same).

Could this bending possibly be done by energy as well then? Or is this just photons traveling in straight lines, lines which just happen to not appear like straight from our point of view.
Imagine gravity to be applying energy to particles including photons instead of gravity bending, would we still have gravitational lensing?

## 1. What is directed energy?

Directed energy is a type of energy that is focused and directed towards a specific target. It can be in the form of electromagnetic radiation, such as lasers, or particle beams. The energy is controlled and directed by technology to achieve a desired effect.

## 2. How does directed energy apply to photons?

Directed energy can be applied to photons by using devices such as lasers or other electromagnetic sources to manipulate and control the properties of individual photons. This can include changing their direction, intensity, or frequency.

## 3. What are the potential applications of applying directed energy to photons?

The potential applications of directed energy to photons are vast and diverse. It can be used for communication, sensing, and imaging technologies, as well as for industrial, medical, and military purposes. It can also be used for research and development in fields such as quantum computing and photonics.

## 4. Are there any limitations or challenges in applying directed energy to photons?

Yes, there are some limitations and challenges in applying directed energy to photons. One of the main challenges is the ability to focus and control the energy precisely, as even small errors can have significant consequences. Additionally, there may be safety concerns, as high-intensity directed energy can potentially cause harm to living organisms.

## 5. What advancements have been made in the field of applying directed energy to photons?

There have been many advancements in the field of applying directed energy to photons. These include the development of more precise and powerful laser technologies, as well as the use of metamaterials and other advanced materials to manipulate and control photons. There have also been advancements in the integration of directed energy with other technologies, such as robotics and artificial intelligence, to enhance its capabilities.