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TechStuff Tidbits: The Terahertz Gap

Published Apr 6, 2022, 10:00 AM

Take a close look at the electromagnetic spectrum and you'll notice there's a span of frequencies we don't seem to use very much. Why is that?

Welcome to tex Stuff, a production from I Heart Radio. Hey there, and welcome to tex Stuff. I'm your host, Jonathan Strickland. I'm an executive producer with I Heart Radio and Health at Tech Area. It's time for a text Stuff tidbits. And recently, my colleague Joe McCormick, who is a co host on Stuff to Blow Your Mind, is also a former writer for the Forward Thinking video series, and he was also a co host on the Accompanying Podcast with Me back in the day. He reached out to me and asked if I had ever done an episode about the Terra Hurts Gap, and I had not, and figured it would be a perfect candidate for a tech Stuff Tidbits episode. So, what the heck is the Terra Hurts Gap. What it has to do with the electromagnetic spectrum. Now, this is the distribution of all the different kinds of electro magnetic energy, from radio waves to visible light to stuff like gamma radiation. All of that is energy that falls along the electromagnetic spectrum. And we describe energy on this spectrum in a couple of different ways, really three ways. Uh. Namely, we describe it by the energy's wavelength of the individual waves of that particular energy. Uh, it's frequency, which is related to the wavelength, and also in terms of photonic energy, kind of like how much oomph this radiation has, which is also related to wavelength and frequency. So wavelength, as the name implies, describes how long that specific kind of energies waves are. So we can think of this energy as traveling in waves. If we want to get quantum with it, we can also think of it as traveling and like particles. But we're not going to get into quantum mechanics quite yet. So when we talk about wavelength, we are talking about a measurable distance. So if we were to plot out a wavelength kind of like a sine wave on graph paper, we would measure the distance from the peak of one wave to the peak of the next wave. Now, these go into an incredible range of of wavelengths. If we look at something like the extremely low frequency band of radio waves, that includes wavelengths that are up to a hundred thousand kilometers long, so a hundred thousand kilometers of wavelength. Now on the flip side of the electromagnetic spectrum, we have gamma radiation. The wavelength for a gamma wave is unimaginably tiny, like a few tenths of an angstrom, and an angstrom is one ten billionth of a meter, so we're talking about a scale that's an order smaller than a nanometer. A nanome there is one billions of a meter. So gamma waves are really really really small. Frequency on the electro magnetic spectrum, on the other hand, describes how many wave lengths of a particular type of energy passes a certain point in a given amount of time. Now, the unit we use is the hurts, and one hurts would be equivalent to a single wave length taking a full second to pass a given point. Uh. Even if we were to look at the extremely low frequency side of the spectrum, where we have those super super long wavelengths like a hundred thousand kilometer long waves, we're talking about a frequency of three hurts at this point, which would mean that three of those waves would pass any given point in a single second. Now, all of these energies are traveling at the same speed, so none of them are going faster than another radio waves at the same speed as a gamma wave. They're all moving at the speed of light. I mean light is part of the electro magnetic spectrum, so gamma rays do not move faster than radio waves. But because gamma rays are so incredibly small and radio waves are so incredibly long, a whole lot more gamma radiation is going to pass a given point in a second than radio radiation. Uh. The analogy I like to use is imagined that you have two lanes on a highway, and in the right lane is a line of buses and they're essentially traveling bumper to bumper at fifty miles per hour. In the left lane, you have a line of any any smart cars. They're also traveling bumper to bumper. They're also traveling at fifty miles per hour. And we put you at a certain point on the highway. We give you a stop watch, and we tell you to count how many buses pas buy you in a span of let's say ten seconds. So over ten seconds, you count the number of buses that pass your point. Then we have you do the same thing, but now you're counting the smart cars that pass you. Well, you're obviously going to count way more smart cars than you will busses in those ten seconds, because multiple smart cars can fit in the same physical space as a single bus. So yeah, the vehicles are all traveling at the same speed, but the size of the vehicle, which relates to the length of a wave, means that you're gonna get way more of the smaller ones than the bigger ones in the same amount of time. As for photonic energy, that also increases as wavelengths decrease and frequencies increase. So gamma radiation packs way more of an energetic punch than say, an extremely low frequency radio wave. Now, over time, we've learned how to harness many of the frequencies that are in the electromagna that ex spectrum in order to do specific kinds of stuff, And there's some messy overlaps and definitions largely depend upon the source. So while I can give you ranges for different types of electromagnetic energy and say like oh, it ranges from this wavelength to this wavelength or this frequency to this frequency. Uh, different definitions can actually have that have a different starting place in different ending place, so it gets a little difficult. For example, you could argue that radio waves range and frequency from three hurts to thirty billion hurts or thirty giga hurts, but that actually overlaps with what is broadly considered the microwave range of frequencies, which according to the most common definitions, go from one giga hurts or one billion hurts up to one hundred billion hurts or one hundred giga hurts and frequency. So there you would see there's some overlap right between one and thirty giga hurts. You would have overlap between the microwave range and the radio range. Um. By the way, we could also say that the microwave range corresponds with wavelengths that are between three millimeters to three millimeters. Remember, as the wavelength goes down, the frequency goes up, and vice versa. Now let's talk about terra hurts and the tara hurts gap. So Tara in this instance refers to trillion in the metric system. So if we go by the different prefixes that we typically use in this realm, kilo means a thousand so akilo hurts is a thousand hurts. Mega refers to one million. Mega hurts would be a million hurts. Giga is one billion, we already mentioned that, and then tara is one trillion. So an electro magnetic energy with a frequency of one tera hurts would mean you would have one trillion wavelengths of this energy pass a given spot in one second. Now, there's a section of the electromagnetic spectrum that sits between the microwave range of spectrums and where infrared begins, and it starts around point one terror hurts and frequency, or around three millimeters if we're looking at wavelength, and it goes up to around ten terror hurts or thirty micrometers in wavelength. And even that is a little fuzzy, right, Like it all depends on your point of view and what you're talking about. How we're talking about harnessing terror hurts frequencies, But it's in this little section of radiation tucked between microwaves and infrared where we haven't quite really harnessed the energy to its fullest potential. Uh So, we can use microwaves to do stuff like set up communication systems where I mean you can use them to heat up food in a microwave oven, or potentially you can use them as a means of transmitting energy to distant receptors for stuff like say space elevators. You wouldn't be generating energy this way. It would literally be you generate energy in one spot or you know, you I guess you're not technically generating, but you're harnessing energy in one spot, transmitting it over distance with microwaves, and receiving it in some distant spot. So it's basic like antenna kind of approach, but you're talking about energy, not communications. You're not modulating the signal for that purpose. We can leverage infrared to create systems that let us see and what would otherwise be darkness. You know, thermal vision works in this way where we can uh see thermal energy, which is infrared energy. Or we can use infrared to create all sorts of kinds of heating elements, and there's even like infrared lasers and things of that nature. And then, of course, later on we have the visible light spectrum, which a lot of us rely upon every single day directly, and obviously a ton of our technology is centered on generating or exploiting visible light. And then at higher frequencies we have stuff like X rays, which we've leveraged for medical imaging and more. But this little band of about point one terror hurts to ten terror hurts has proven to be a little more tricky for us to lean on. I'll explain more after we come back from this quick break. All right, let's think of it this way. This range of frequencies in the electro magnetic spectrum kind of represents a zone that exists between the world of electronics and the world of optics. Optics obviously being technology that deals with light in some way, and in the realm of tech, you can almost think of it as kind of a no man's land, at least for broad technology. It's like a dead zone. Uh, this is the terror Hurts gap. So we can rely on technology like high speed transistors and oscillating circuits to create lower frequency electromagnetic radiation. So this would be like microwaves and radio waves and that kind of stuff. We can use electronics to do that. For the higher frequency stuff, we can use semiconductor lasers to produce that kind of radiation from you know, visible light all the way up to X rays. But between these two we have that dang Terra Hurts gap, and the range in the Tarro Hurts gap is one where we can't really produce those frequencies using either of those primary methods. We have to go with other methods. And I could rattle off those methods, but honestly, it would start to sound like science fiction. You know, words like quantum would be coming up, and the point being that they aren't your run of the mill approaches to creating electro magnetic radiation. It's the type of stuff you find in super high tech laboratories. However, this doesn't mean that no one has any idea regarding how we might exploit terror hurts radiation in the future. In fact, it's it's a pretty rich area of research among physicists, and it's something that astronomers and cosmologists already use in order to study the universe. So labs around the world have discovered various methodologies for generating terror hurts frequencies or for you know, detecting terror hurts radiation. But these are exceptions and so far have not evolved to a point where we could say, scale them up and mass produce them or make efficient use of them, where it would make sense to start using that technology for um, you know, broader purposes. For these very specific, narrow purposes where you're talking about laboratory research, you know, like cutting edge research. It makes sense there because you could be hitting some incredible breakthroughs that you otherwise wouldn't without the techno apology, but for practical everyday use, it doesn't yet make sense. We haven't correcked that code yet. And that's not to say there's a lack of interest there, but there are certain properties of terra Hurts frequency energies that kind of limit their applicability. So, for example, the heart's atmosphere is pretty darned good at absorbing electromagnetic radiation in that tara Hurts gap range of frequencies. So we're talking about these these forms of radiation able to travel maybe a couple dozen meters before they get absorbed by the atmosphere. So that makes this band of electromagnetic energy unsuitable for stuff like say terrestrial communication systems, because you would have to put your transmitters and your receivers so close together you might as well just start shouting out the window. Now, you could potentially create short distance networking systems that used Tara Hurts radiation to transmit data, Like if you wanted to make an indoor Wi Fi network, that's something that this technology could potentially do. Most of the devices we rely on for wireless networks have a fairly limited range already, so it's not like that would be unusual to us, and you could potentially have a terra hurts radiation based indoor Wi Fi system that was super high throughput if we found a way to generate terror hurts frequencies that was cost effective and efficient. Now, on top of that, liquid water will absorb tera hurts radiation, so there's no real application where we could use it for anything that would involve water. Uh, ditto for metals. It is highly reflected off of metals, So you could say there's some limited use cases for terror hurts radiation for things like communications. However, there are other properties that this energy has that are potentially of huge benefit, and in fact it's being used in that way in some limited cases. So, for example, these frequencies are capable of penetrating some types of matter, including body tissue, to a certain degree. That makes them kind of like X rays, But unlike X rays, Terror hurts rain radiation is non ionizing, so that means it doesn't have that photonic energy that would be required to say, strip electrons from their atoms. So X rays are an ionizing form of radiation. One of the consequences of this is that exposure to X rays can cause cellular damage. This ionizing radiation can damage cells and you can lead to serious things like like cancer. Uh. The energy and the terror Hurts gap lacks that ionizing capability, so it would be much more safe to use for medical imaging. However, because the wavelengths in this frequency band are longer the next rays. Remember, higher the frequency, the shorter the wavelength. So this is a lower frequency, longer wavelength energy and you know, it's actually even longer than visible light. Visible light is is a higher frequency than the terror Hurts gap. That means if we were to use devices that generated electromagnetic waves in this gap band for the purposes of imaging for medical purposes, we would actually end up with lower resolution pictures than we would if we were to use X rays. That the wavelengths are literally too large to give us the same resolution we would get with an X ray, So we would have to develop methods to enhance the image quality uh that the we would get from these terror Hurts technologies if in fact, we were to start using them for medical imaging. Another potential use for terror Hurts radiation is to examine non conducting materials because, like I said, it can penetrate paper, plastic, wood, ceramics, and cardboard, So water and metals are out, but this other stuff is totally in. So theoretically we could build this technology that could be used to scan for stuff like prohibited materials like weapons or you know, biologically hazardous materials, and it could even be a remote system. You could use Tara Hurts radiation to scan someone remotely. The radiation itself would be harmless, and as long as you weren't too far away where the Tara Hurts radiation would be absorbed by the atmosphere, you could scan folks safely and remotely. Astronomers have actually been using Tara Hurts frequency detection for a while now to measure stuff like the cosmic microwave background radiation that in turn is connected to the earliest moments of our universe, kind of like the moments after expansion or even during expansion. So it's kind of like being able to peer back into the earliest days of the universe, um like the evolution of the universe in the in the early early times after the first instant. And we might use Terror Hurts radiation in the future to do stuff like improve manufacturing processes. You can build machines that use terra hurts scanning to look for flaws and manufactured components, for example. But in order to do all that, we first have to create technologies that can generate terror hurts radiation without relying on the super advanced tech that you'd only find sophisticated physics labs. And we're just not there yet, though there's been a lot of experimentation in the space. My guess is that the terror Hurts gap is a temporary thing. It's really just a way for us to say there's this one band of frequencies within the electromagnetic spectrum that will probably end up relying on heavily in the future for all sorts of applications. But first we have to find scalable and economic ways to create the tech that generates those frequencies. So it's really just a matter of time. But that's what the terror Hurts gap is and what that means. So if you have suggestions for future tech Stuff, tidbits, topics, really any other tech Bay topic, reach out to me on Twitter. The handle we use for the show is text Stuff h s W and I'll talk to you again really soon. Y. Text Stuff is an I Heart radio production. For more podcasts from my heart Radio, visit the i heart Radio app, Apple podcasts, or wherever you listen to your favorite shows.

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