Han Yi, who originally planned to return to Jinling on the 12th, was blocked at the door of the construction site by people from the Guangdong Branch of the Chinese Academy of Sciences.

A total of 27 people led by Shen Zi'an, an academician of the "Micro-Nano Optics and Photonics Application" Research Institute, came to discuss with Han Yi about air projection technology.

If it was before, Han Yi would probably be perfunctory;

However, time has changed, and air projection technology will be used on a large scale for commercial applications in the future, and it is not suitable for hardware or software to continue to cover the lid.

What's more, the outside world has always been skeptical of him as a scumbag, breaking through the theory that "pure air cannot refract light".

In that case, let's talk!

In the electrical classroom of SUSTech to the west of the construction site, more than 40 authoritative professors in optoelectronic and electronic engineering from Sun Yat-sen University, Huali Institute of Technology, SUSTech, etc., participated in the seminar.

In addition, there were more than 300 students from SUSTech in the audience, who had the honor to listen to the first "Optical Application Summit Forum Lecture" in China.

First of all, Yang Wanqi, a doctor of electronic engineering from Sun Yat-sen University, asked Han Yi to explain the design concept of "photon superposition method".

Han Yi got up from the semicircular sofa, walked to the front of the big screen on the podium and said with a smile: "Thank you Dr. Yang Wanqi for your question."

When it comes to the design concept of photon superposition, we must first talk about the principle of light integration. ”

Han Yi picked up the electric teaching stick on the podium, pointed to the polygonal graphics on the big screen behind him, and said: "Ray integration imaging can make the light emitted by this point in space,

After a large number of refraction and reflection units, the point is re-intersected at this position, so that the image above is suspended in the air.

According to this principle, the Russian designer Kamanin invented the Displai air display.

As we all know, Displair is composed of air, water and light, and the base ejects ultra-fine water droplets into the air, making these water droplets form a translucent screen.

The 3D image is then projected onto the mist in the air to create a strange image like a "castle in the sky".

Nowadays, Displai technology has been widely used in commercials by big companies such as Google, Coca-Cola, and Pepsi. ”

Han Yi smiled and said: "Of course, Displai is good enough technology, but the shortcomings are also obvious, it has high requirements for light, and once it is disturbed, it cannot maintain the image."

So as you can see, Displai is generally displayed indoors.

As for the outdoors, light, media, air, etc., can cause fatal interference to Displai. ”

The experts on the stage showed thoughtful expressions.

Many students in the audience had different expressions, but most of them were very excited.

The most popular Tianyi Technology boss in China in recent years has personally explained their core technology, and such an opportunity is really rare.

Just look at the black crushing heads outside the classroom, how lucky are they?

Dr. Shen Zi'an took the microphone and asked politely, "Hello Mr. Han, can you tell us about the specific imaging principle?"

This issue should be of concern to the whole world.

It's just that ordinary people don't ask, they don't dare to ask, and if they ask, it's useless.

But since this is an academic seminar, this question is naturally unavoidable.

"Okay!" Han Yi agreed very simply.

"First of all, let's talk about the path of light propagation. To explain it according to Fermat's principle, the time it takes for light to propagate may not be a minimum, but a maximum, or even an inflection value.

From Fermat's principle, we can derive Snell's law.

By setting the optical path path as the derivative of time to zero, the "smooth path" can be found, which is the light propagation path. ”

As he spoke, Han Yi picked up the chalk, walked to the blackboard next to him and began to write a few strokes, explaining while writing, "The propagation speed of light in medium 1 and medium 2 is v1=c/n1 and v2=c/n2 respectively.

where c is the speed of light in a vacuum.

Since the medium slows down the speed of light, the refractive index n1 and n2 will be greater than 1. ”

Hearing his explanation, the experts and professors on the stage nodded in understanding.

The students in the audience are okay, and those who are purely here to see the excitement show a confused look.

Didn't you say that it was a "pretending forum", how did it become an academic seminar?

Han Yi on the stage did not pause, "Everyone should know the three basic laws of geometric optics.

Since light waves are electromagnetic radiation in a specific frequency band, the light must satisfy Maxwell's equations and the accompanying boundary conditions. Assuming that the boundary is xOy plane......"

"Damn, I don't know what the three laws are. ”

"What are Maxwell's equations?"

Seeing their confused appearance, the students outside the electric classroom who didn't catch up with the opportunity to enter immediately gloated.

Let you join in the fun, don't know how to pretend to understand, this is stupid, right?

Han Yi continued to explain, "From the equality of the wave vector x-component, we can get kisinθi=krsinθr,

Based on the numerical deduction of the laws of optics, from which we derive the basic algorithm ......"

I wrote a blackboard full of equations for photonic algorithms.

Han Yi put down the chalk and turned to look at everyone, mainly Dr. Shen Zi'an on the right, "The photonic algorithm based on geometric optics is probably like this;

Due to commercial secrecy, I will not list the specific overlays here;

However, we can see that in tensor displays, multilayer silicon wafers can be regarded as a set of optical emphasizers, and light will be modulated by silicon wafers when it passes through;

Among them, ε1, ε2, ε3, ε4, and ε5 are the different positions on the five layers of silicon wafers, Ω are the exit positions, and Ψ is the offset distance of each layer.

In order to display larger viewing angles and higher display quality, advanced sub-matrix factorization is required.

As you can see from the equations on the blackboard, the finer the pixels and the more layers, the more modulating power the silicon wafer has.

This way, there will be no image interference problems that Displai encounters.

And this is the imaging principle of photon superposition. ”

Many experts and scholars at the scene showed a look of sudden realization.

Especially Dr. Shen Zi'an, the back of his hand on the armrest trembled slightly.

Han Yi said that these are all real dry goods, and many of them are foreign secrecy things.

With these equations, China can take at least three years of detours in the field of optical applications.

In particular, it cannot be ignored that as a leader in photonic applications in China, Han Yiqi's solid knowledge of optics has surpassed that of most theoretical professors.

This can be seen from Han Yi's explanation that he never paused from beginning to end.

In Shen Zi'an's view, Han Yi is a wolf in the Chinese optical industry.

In the near future, China's "optical sheep army" led by his "wolf" will be like an awl to pierce the technological blockade of China abroad.

The more than 300 students in the audience were even more unaware.

Whether you can understand it or not, anyway, the doesn't come out of your mouth!

Look at the equations on a blackboard, let alone write them, they can't copy them completely.

"This is a real technical master!"

In my opinion, Boss Han is the godfather of domestic optics. ”

"To be honest, I always thought that the Tianyi Photon Superposition Method was blown out, but I didn't expect it to be real. ”

"yes, I thought it was fake. Last month, Dehua Lau said that the special effects created by the photon superposition method, I was reluctant to see it, which is a pity. ”

Next, everyone on the stage had an in-depth discussion with Han Yi on the application of photonics in various industries.

Han Yi also knows everything and says everything.

After the experts and scholars on the stage finished asking questions, it was time for the interactive session.

Originally, there was no relevant arrangement, but the atmosphere was so good that a leader of SUSTech temporarily added a link after soliciting Han Yi's intentions.

The first person to get the opportunity was a student of optoelectronic information engineering at SUSTech, who is a very cute glasses girl.

When she got the microphone, the glasses girl was so excited that she forgot to turn on the sound, and after saying a few words, she found out, which attracted a good-natured laughter.

"That...... That, hello Mr. Han, do you think there is a future for learning optoelectronics?

That's it for me. After speaking, the glasses girl turned off the microphone and sat down with a flushed face.

Han Yi picked up the microphone and said with a smile: "Don't say anything big and general."

I can tell you clearly, as long as you are not a scumbag, the future of learning optoelectronics is bright. If you don't have the light, come to me in Tianyi, and I will help you arrange work. ”

"Hahaha......"

The students laughed, and the experts and scholars were even happier.

In 2016/17, 22 schools were cancelled, accounting for 4 percentage points, due to the partial adjustment of the degree authorization points withdrawn and added.

Among them, even the optical degree authorization point of Zhonghai Tongji University has been cancelled, so you can imagine how grim the situation is?

If it weren't for the birth of Tianyi Technology, the fate of those non-985/211 engineering colleges and universities would be worrying.

Nowadays, Han Yi, as the first person in the application of optics in China, said that the future of optics is bright, and it is predictable that the number of students who apply for optical engineering will definitely increase significantly when the school starts this fall.