Visit Science News to read breaking news about the latest discoveries in science, health, the environment, technology and more.

Wednesday, 5 February 2020

New Graphene Device Detects and Amplifies Terahertz Waves


In recent years, physicists and engineers have learned to detect and control almost the entire electromagnetic spectrum, from UVs to infrared to gamma rays. However, a range of frequencies still escaped scientists: the terahertz frequency (THz). But recently, a team of researchers has developed a THz graphene detection device capable of amplifying THz waves. A real scientific feat that could lead to a whole new technological era.

Please support by Sharing the article and also by visiting the ads in the post, your little click can help us to keep posting the beneficial Stuff, please leave a comment if you have any suggestions:
And Please follow us on Twitter  and Facebook
Thank you 😊

Terahertz (THz) waves lie between microwaves and infrared in the electromagnetic frequency spectrum, but due to their low energy, scientists have not been able to exploit their potential. The riddle is known in scientific circles as the "terahertz divide".



Being able to detect and amplify THz waves (T rays) would open up a new era of medical, communication, satellite, cosmological and other technologies. A major application would be a safe and non-destructive alternative to X-rays. However, so far, the wavelengths involved, which vary between 3 mm and 30 μm, have proven to be impossible to use due to relatively weak signals from from all existing sources.

Place THz waves in the electromagnetic spectrum. Credits: Y. Chassagneux

A THz wave amplifier based on graphene

A team of physicists has created a new type of optical transistor - a functional THz amplifier - using graphene and a high-temperature superconductor. The physics behind the amplifier is based on the properties of graphene, which is transparent and not sensitive to light and whose electrons are “massless”. It is made up of two layers of graphene and a superconductor which trap the “massless” electrons of graphene between them like a sandwich.

THz radiation hits the device and is re-emitted with amplified energy. Credits: Loughborough University

The device is then connected to a power source. When THz radiation hits the outer graphene layer, the trapped particles inside it attach to the outgoing waves, amplifying them. Professor Fedor Kusmartsev of the Loughborough Physics Department explains: “When the THz light hits the sandwich, it is reflected like a mirror. The main point is that there will be more reflected light than that which hit the device."

"It works because external energy is supplied by a battery or by light hitting the surface from other higher frequencies of the electromagnetic spectrum. THz photons are transformed by graphene into massless electrons, which, in turn, are transformed back into reflected and energized THz photons. Because of such a transformation, THz photons get their energy from graphene - or the battery - and weak THz signals are amplified.”

Towards control of the THz frequency and the advent of a new technological era

The study was published in the journal Physical Review Letters . The team continues to develop the device and hopes to have prototypes ready for testing soon. Professor Kusmartsev said he hopes to have an operational amplifier ready to go on the market in about a year. He added that such a device would greatly improve current technology and allow scientists to reveal more about the human brain.

The THz amplifier is small enough to fit into many technologies. Credits: Loughborough University

“The universe is full of terahertz radiation and signals. In fact, all biological organisms absorb and emit them. I hope that with such an amplifier available, we will be able to discover many mysteries of nature. For example, how chemical reactions and biological processes happen, or how our brain works at the thought level,” says Kusmartsev.

"It has properties that would greatly improve vast scientific fields such as imaging, spectroscopy, tomography, medical diagnosis, health monitoring, environmental monitoring and chemical and biological identification. The device we have developed will allow scientists and engineers to exploit this bandwidth and create the next generation of medical equipment, detection equipment and wireless communication technology,” he adds.




Bibliography:

Optical transistor for amplification of radiation in a broadband terahertz domain

Phys. Rev. Lett.

K. H. A. Villegas, F. V. Kusmartsev, Y. Luo, and I. G. Savenko

https://journals.aps.org/prl/accepted/4c07bK4dM5f1bc06a40b1134b1b07c1648b392836

5 comments:

  1. Its a great pleasure for me to write this testimony about how i got my Genital Herpes cured a month ago. i have been reading so many comments of some people who were cured from various diseases by Dr Aza but i never believed them. I was hurt and depressed so I was too curious and wanted to try DR. Aza then i contacted him through his email, he assured me 100% that he will heal me, i pleaded with him to help me out. My experience with him was great, he healed me just as he promised. he sent me his medication and ask me to go for a medical check up after two weeks of usage. i agreed with him i took this medication and went for a check up, to my greatest surprise my result was negative, i am really happy that i am cured and healthy again. I have waited for 3weeks to be very sure i was completely healed before writing this testimony. I did another blood test one week ago and it was still Herpes negative. so i guess its time i recommend anyone going through the same way. reach him through his email address: drazaherbalcenter@gmail.com  OR call, add him on Whatsapp +1(315) 795 1518   

    ReplyDelete
    Replies
    1. Never give up in life they all say no cure to HSV 2 which is a big lie I have pass through many process also i never believe there is really cure to HERPES until I meet Dr.Ehiaguna the doctor that have been helping many people for many years, I come across this doctor online when I was searching for cure online I found out about this man, and to my greatest surprise this man have the herbal medicine which I have been looking for years I explain my problem to him through the email I found on someone who testify about him also, Dr.Ehiaguna write me a reply and explain how the process work so after ordering for the medicine I got it within 4 days and I took it according to the way Dr.Ehiaguna instructed, I was so happy after two week I took the medicine there was very big change in my health when I was done with the process I go for test, I found out I am negative that was the day I have the tears of joy you can also get in contact with my doctor through his email now drehiaguna@gmail.com or you can also WhatsApp him +2348073908953. And He also have herbs medicine to cured the following diseases; eczema,urethra wart,chronic problems.Herpes, Cancer, Als,Hepatitis, Diabetes, HPV,Infections,ulcer  ETC

      Delete
  2. I really want to appreciate Dr Akhigbe for using his herbal medicine to cure my Herpes. since 3 years now I have been living with this virus and it has been giving me challenges, I was so perplexed cause i have been taking several drugs to be cured but all of my effort was in vain,one morning i was browsing through the Internet then i saw several testimonies about Dr.Akhigbe curing people from Herpes virus and immediately i contacted Dr.Akhigbe on his email: Drakhigbeherbalhome5@gmail.com, i told him about my troubles and he told me that i must be cured, gave me some instructions and which i rightly followed. so he prepared a herbal medicine for me and sent it to me which i used for 3 weeks and everything was like a dream to me and my Herpes virus was totally gone, why don't you contact him today and be free from your diseases because he is very good and honest Doctor. contact him via email; Drakhigbeherbalhome5@gmail.or call/whatsApp him on +2349021374574

    ReplyDelete
    Replies
    1. Never give up in life they all say no cure to HSV 2 which is a big lie I have pass through many process also i never believe there is really cure to HERPES until I meet Dr.Ehiaguna the doctor that have been helping many people for many years, I come across this doctor online when I was searching for cure online I found out about this man, and to my greatest surprise this man have the herbal medicine which I have been looking for years I explain my problem to him through the email I found on someone who testify about him also, Dr.Ehiaguna write me a reply and explain how the process work so after ordering for the medicine I got it within 4 days and I took it according to the way Dr.Ehiaguna instructed, I was so happy after two week I took the medicine there was very big change in my health when I was done with the process I go for test, I found out I am negative that was the day I have the tears of joy you can also get in contact with my doctor through his email now drehiaguna@gmail.com or you can also WhatsApp him +2348073908953. And He also have herbs medicine to cured the following diseases; eczema,urethra wart,chronic problems.Herpes, Cancer, Als,Hepatitis, Diabetes, HPV,Infections,ulcer  ETC

      Delete
  3. HELLO EVERYONE.. FEW MUNINETS TO REDY THIS INFOR ON HERPES CURE 2018..2017 MY MOTHER WAS DIAGNOSED OF HERPES/ KNOWN AS GENITAL WARTS ,I SPENT A LOT OF MONEY ON HER MEDICATION TILL A POINT I EVEN LOST HOPE,BECAUSE MY MOTHER WAS GRADUALLY DYING AND LOST HER MEMORY TOO, I WAS SO DESPERATE TO GET MY MOTHER BACK TO NORMAL, ONE DAY MY UNCLE WHO LIVES IN LONDON UNITED KINGDOM TOLD ME ABOUT DR OLIHA ,WHO HELPED HIM GET RID OF HERPES /GENITAL WART WITH HERBAL MEDICINE AND HIS HERBAL SOAP ,I WAS SO SHOCKED WHEN HE TOLD ME ABOUT THIS ,ALTHOUGH I NEVER BELIEVE IN HERB BUT, I KEEP TO BELIEVE BECAUSE MY UNCLE CAN'T TELL ME LIES WHEN IT COMES TO HEALTH CONDITION I CONTACTED DR OLIHA VIA HIS EMAIL; OLIHA.MIRACLEMEDICINE@GMAIL.COM , YOU CAN TALK TO HIM VIA CALL OR WHATSAPP MESSENGER ON +2349038382931 , HE REPLIED AND ASK ME TO SEND MY HOME ADDRESS AND MY MOTHER'S DETAIL AND THEN I PURCHASED THE HERBAL MEDICINE,SENT ME THE HERBAL MEDICINE THROUGH COURIER SERVICE, WHEN I RECEIVED THIS HERBAL MEDICINE USED IT FOR 2 WEEKS, AND 4 DAYS OF USAGE THE WARTS FELL OFF, MY MOTHER I NOW TOTALLY CURED AND MY MOTHER IS LIVING FREE AND HAPPY AGAIN. YOU CAN TALK TO DR VIA HIS MOBILE NUMBER OR WHATS APP HIM ON +2349038382931.ALL THANKS TO DOCTOR DR OLIHA

    ReplyDelete

About us

we are bunch of Guys who Love Science and Technology, we are aware that our site looks junk but we don't have enough money to make our website much better,Your support will keep us growing, Please keep Sharing and join us on facebook and twitter. Thank you for reading our articles, Please leave comments if you feel anything, Have a Nice Life