Researchers Transmit RF Signals via Laser Beams

first_imgResearchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have demonstrated a laser that can emit microwaves wirelessly, modulate them, and receive external radio frequency signals. It is the first time a laser has been used as a radio frequency transmitter. Researchers transmitted recording of Dean Martin’s classic “Volare” wirelessly via a semiconductor laser.This research opens the door to new types of hybrid electronic-photonic devices and is the first step toward ultra-high-speed Wi-Fi. This study builds off previous work from the Capasso Lab. In 2017, the researchers discovered that an infrared-frequency comb in a quantum cascade laser could be used to generate terahertz frequencies, the submillimeter wavelengths of the electromagnetic spectrum that could move data hundreds of times faster than today’s wireless. In 2018, the team found that quantum cascade laser frequency combs could also act as integrated transmitters or receivers to efficiently encode information.Now, the researchers have figured out a way to extract and transmit wireless signals from laser frequency combs. Unlike conventional lasers, which emit a single frequency of light, laser frequency combs emit multiple frequencies simultaneously, evenly spaced to resemble the teeth of a comb. In 2018, the researchers discovered that inside the laser, the different frequencies of light beat together to generate microwave radiation. The light inside the cavity of the laser caused electrons to oscillate at microwave frequencies – which are within the communications spectrum.The first thing the new device needed to transmit microwave signals was an antenna – so the researchers etched a gap into the top electrode of the device, creating a dipole antenna (like the rabbit ears on the top of an old TV). Next, they modulated the frequency comb to encode information on the microwave radiation created by the beating light of the comb. Then, using the antenna, the microwaves containing the encoded information radiate out from the device. The radio signal is received by a horn antenna, filtered, and sent to a computer.The researchers also demonstrated that the laser radio could receive signals. The team was able to remotely control the behavior of the laser using microwave signals from another device.This all-in-one, integrated device holds great promise for wireless communication. While the dream of terahertz wireless communication is still a ways away, this research provides a clear roadmap showing how to get there.The Harvard Office of Technology Development has protected the intellectual property relating to this project and is exploring commercialization opportunities.last_img read more

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The Inspiring Story Of The Blues – Chelsea Football Club

first_imgChelsea was founded in 1905 who had earlier bought Stamford Bridge. The founder is known as Gus Meras. Meras has the intention of turning Stamford Bridge into a football ground. He originally wanted to rent it to a cub that existed but changed his mind when the Fulham’s deal was halted. The idea of starting a club got him, and that is how he came up with Chelsea FC.The biggest team in LondonSince its establishment, Chelsea overgrew due to the local support. There was huge attendance, which made the club rich hence, players were being paid well. It became the most vibrant club in the country. In the first five years, the team stayed in division one and two. Today, the club is always perceived as being unstoppable. It has won seven FA cups, five league titles, and five league cups. They have also managed to win major UEFA trophies which include: Europa, champion’s league and cup winner’s cup. The team’s success has made several people gamble in its favor at various agen poker sites. First league titleThe first league title won by Chelsea was in 1955. This is after the team had always finished at the bottom half of the league in the years that had passed. They then won their first league cup in 1965 followed by the FA Cup which was won in 1970 and the cup winner’s cup which was won in 1971. From this point, it took the club time before making another trophy. This was due to the financial difficulties that the club started facing. The challenges came as a result of the development of the Stamford Bridge. The club’s fans also demonstrated to some hooliganism which contributed to the difficulties. The officials of the club at some point were fighting bankruptcy, and this made the club’s field result not to be made a priority. The club was then sold in 1982 to new management.AdChoices广告Embed from Getty Images Embed from Getty Images Return to lightChelsea club returned to spotlight in 1997 under the management of Ruud Gullit. However, the club did not manage to go to the premier league in the time. The club got back to being one of the clubs that excited people in English football. During this period, they also managed to win some trophies. In 2003, the club was sold to a Russian billionaire, and this marked the change of everything. The club was financially stable, and it managed to win the premier league back-to-back titles. The club has continued to dominate the English football henceforth. Agen poker sites where fans show their love for Chelsea. ConclusionChelsea football club has millions of people celebrating it as their favorite football teams. The determination set by the founder has made sure that the organization becomes successful. The changing of engagement of the team has also played a crucial role in ensuring that the football club in under proper management. For any football club to bear fruits, their control must be determined to ensuring that the team’s mission and vision are achieved. Therefore all the celebrated football teams in the world have a story behind their success. Follow West London Sport on TwitterFind us on Facebooklast_img read more

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Hamilton wins in Brazil as Mercedes take fifth F1 title

first_imgSAO PAULO,  (Reuters) – A lucky Lewis Hamilton won a tense Brazilian Grand Prix yesterday as his Mercedes team clinched the constructors’ title for the fifth year in a row and Max Verstappen raged at a lost opportunity. The win was the 72nd of Hamilton’s stellar career and 10th of a season that has already seen the 33-year-old Briton clinch his fifth championship, delivering Mercedes their fifth successive double.Hamilton had started on pole position but could not hold off Red Bull’s Verstappen, who led until a collision with Force India backmarker Esteban Ocon on the 44th of 71 laps sent the Dutchman into a spin and put the Mercedes driver back in front.A seething and swearing Verstappen battled back but could not close the gap, finishing runner-up 1.469 seconds adrift of Hamilton, who had never previously won in a season where he has taken the title with races to spare. Verstappen then took matters into his own hands in an angry post-race confrontation with Ocon that led to both being summoned by stewards.Ferrari’s veteran Kimi Raikkonen held off Red Bull’s Daniel Ricciardo to complete the podium on his 150th start for the Italian team.Ferrari had to score 13 points more than Mercedes to keep their hopes alive until Abu Dhabi at the end of the month but failed, with Sebastian Vettel finishing only sixth and behind Mercedes’ Valtteri Bottas in fifth. Mercedes now have 620 points with Ferrari on 553 and 43 still to be won.“That’s it. That’s the double, mate. MercedesAMG are the world champs,” Hamilton was told as he took the chequered flag at Interlagos after a race fraught with concerns about his tyres and engine.“It’s been an incredible journey with them. This is what everyone worked for, for the whole year,” said the ecstatic champion as the celebrations started with one race to go. “I’ve always told you how much of an honour it is to drive for them. Today was the best style that we could do it because we were struggling, we had problems to the end. We were a sitting duck at one stage.”Only the sport’s oldest and most successful team Ferrari have previously managed to win five championships in a row, taking six in succession during their golden Michael Schumacher era from 1999 to 2004.“It was a very difficult season, we had up and downs. Ferrari came back very strong and Red Bull at the end but that makes the championship victory even more enjoyable,” said team boss Toto Wolff. Verstappen, winner in Mexico two weeks ago, joined Hamilton on the podium but the Dutchman knew he should have been on the top step.The collision was the talking point of the day, with arguments on both sides.Ocon was handed a 10-second stop-and-go penalty for causing it but that came as no consolation for Verstappen, whose colourful language over the radio was largely bleeped out for television viewers.When the Dutchman found Ocon, at the post-race scales, matters became more physical with the Red Bull driver caught on television confronting the young Frenchman and giving him a shove. “You do everything well, you go through the field, we had a great car and then by such an idiot you get taken out while he’s being lapped. I have no words,” said Verstappen.“You can easily say afterwards that I have much more to lose than him but I’m just trying to do my race. Suddenly, a backmarker is trying to race you and taking a stupid risk to dive inside. What can I do about it?“The penalty for me is that I lost the victory but hopefully in 15 years’ time we can laugh about it.” Sauber’s Ferrari-bound rookie Charles Leclerc was ‘best of the rest’, the Monegasque finishing seventh after running as high as fourth during the pitstops.Haas savoured a double points finish to close on fourth-placed Renault, with Romain Grosjean eighth and Danish team mate Kevin Magnussen ninth.Ocon’s Mexican team mate Sergio Perez took the final point for a team that had hoped for much more.last_img read more

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