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Light wheel - new type of light wave extends the possibilities in nanotechnology

Light wheel - new type of light wave extends the possibilities in nanotechnology | Possibilities, Conflict and Prejudice Assignment by_Ivan Koh | Scoop.it

Propeller or wheel? In circularly polarized light, the vector which represents the electric field of the light wave (blue arrows in above figure) rotates helically in the direction of propagation. Such an electromagnetic wave has longitudinal angular momentum. If two circularly polarised waves rotating in opposite directions meet at a focal point, light with purely transverse angular momentum is generated. Its electric field vector rotates about an axis perpendicular to the direction of propagation like a bicycle spoke.

Light in general can exert incredible forces. According to the rules of quantum mechanics, light is an electromagnetic wave, as well as a stream of photons. Since it has momentum, a transparent particle through which a light beam falls experiences a recoil when the photons leave it. Although the force which a photon exerts in this process is almost infinitesimal, the effect of innumerable light particles in intense and tightly focused laser beams adds up in such a way that objects up to a few micrometres can be held in an optical trap or moved in a specific way. Biologists, for example, use this effect in optical tweezers to fix cells and rotate them at the focus of a microscope. To this effect, scientists working with Gerd Leuchs, Director at the Max Planck Institute for the Science of Light, are now creating new possibilities for them.

 

The team has created a photonic wheel, i.e. light with purely transverse angular momentum: the electric field of the electromagnetic wave rotates about an axis whose orientation is perpendicular to the direction of motion, just like the axis of a wheel. Until now, physicists have mainly been familiar with light with longitudinal angular momentum where the electric field rotates like a propeller around an axis aligned along the direction of motion. “The possibility that light can have purely transverse angular momentum when averaged over the complete cross-section of the beam had not been realised before,” says Peter Banzer, who made a significant contribution to the discovery.

 

This is because, as the Erlangen-based physicists have now shown both theoretically and practically, it is indeed possible to generate light with purely transverse angular momentum - and what’s more it is surprisingly easy to do so. “Once it’s down on paper, it looks easy,” says Gerd Leuchs. But somebody has to come up with the idea in the first place. The researchers are now developing this idea using circularly polarised light. A wave of circularly polarised light turns like a screw around the direction of beam propagation and has propeller-like longitudinal angular momentum. Light with circular polarisation can be generated with the aid of a birefringent crystal, for example.


Via Dr. Stefan Gruenwald
Ivan Koh's insight:

This article is about telling that using light manipulation, we may be able to utilise nanotechnology. It goes down into the scientific terms of how its done and how it can be used to benefit other things. I think the factors leading to the realization of reaching the possibilities is mostly still limited to science. One may come up with an idea but if it cannot be proven theoretically or scientifically, then its still far from being a possibility.
I wonder then how some science discovery and breakthrough happened through accidents. 

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Case Study: Sri Lanka - Conflict and Harmony in Multi-Ethnic Societies - Resource Guides at National Library, Singapore

Case Study: Sri Lanka - Conflict and Harmony in Multi-Ethnic Societies - Resource Guides at National Library, Singapore | Possibilities, Conflict and Prejudice Assignment by_Ivan Koh | Scoop.it
This LibGuide explores the following themes: 1. causes and effects of conflict in a multi-ethnic society (case studies of Northern Ireland and Sri Lanka and 2. challenges in resolving ethnic conflicts.

Via Liang YouQI
Ivan Koh's insight:

This article tells me about how Sri Lanka had many problems regarding in harmony and multi-ethnic societies, leading to many civil wars in Sri Lanka.

I think that Sri Lanka suffers from acceptance, as the Tamils when under control of the British was privileged in Jobs and opportunity, but when the government took independence, they enforce laws that specifically made life difficult for the Tamils. The resulting non-cooperation led to violence and wars. I think this could be averted by making good decisions and make fair policies for everyone in Sri Lanka so that neither one of the race have to live in burden anymore. I wonder though why did the government just led a civil war happen and did not do enough to solve it fast before many dies in the war.

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Hui Yu Leong's comment, July 2, 2013 6:19 AM
From this article, I can see that many lives were affected by an internal ethnic conflict, if everyone had been more understanding to wards each other, would as many lives be lost?
Hui Yu Leong's comment, July 2, 2013 6:24 AM
In this article, I can see the disastrous outcomes of not being a multi racial country like singapore. If the sri lankan government had not favoured one race over anothe, none of this would have happened. Young teenager would not have to join dangerous groups to fight for their freedom and everything would have been fine. This article has taught me the importance of being a fair and just country where everyone is given an equal opportunities, this article has also taught me the importance of peace and harmony as an internal conflict can cause the whole nation to be affected in a negative way.
Pua Peng Guan's curator insight, July 2, 2013 10:19 AM

This is my insight using See-Think-Wonder thinking routine. From this article, I can see that the conflict between the Sinhalese and the Tamils in Sri Lanka has not been resolved even after 100 years which is suprising. Over this long period, many innocent lives have been lost, which is heartbreaking. I think that this conflict between the two races can be resolved as long as they are willing to understand each other more and accept one another. I wonder what was the start of all these arguements and why it cannot be solved even after so many years, and how serious is the problem that is worth the sacrifice of so many innocent people.

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How Singapore creates its economic miracles | Globe and Mail

How Singapore creates its economic miracles | Globe and Mail | Possibilities, Conflict and Prejudice Assignment by_Ivan Koh | Scoop.it

 

When Gregory Wade left Research In Motion’s Asia Pacific headquarters here last fall, the logical thing to do might have been to pack up his family and head home to his native shore of British Columbia.

 

Instead, the eight-year expat joined an equity firm and continued preaching the economic miracle of Singapore, coaching Canadian firms looking to set up shop in the region as a vice-president for The Canadian Chamber of Commerce in Singapore.

 

“You will sense a vibe of growth, of energy, a sense of entrepreneurship and the desire and interest to create new and innovative products and services,” said Mr. Wade, who is now managing director of mobility at InflexionPoint Acquisition Corp. “I didn’t get that same vibe in Canada, regardless of locale.”

 

For a city-state with no resources, limited land and a small population, creating the explosive growth and development of the past half-century has meant running it like a corporation – using highly trained, highly paid leaders, inviting the world’s best and brightest to its work force with an open-door policy, and with a near-zero tolerance for dissent among the masses.

 

The result is a planned, modern economy with efficient public services, an educated population and a per-capita share of gross domestic product of more than $60,000 (U.S.), the highest in Southeast Asia. Singapore ranks No. 2 on the World Economic Forum’s global competitiveness rankings.

 

Today, as Singapore nears the 50th anniversary of its independence, the original economic miracle is slowing. Hit hard by the Asian financial crisis, the dot-com bust, the outbreak of SARS in 2003 and then global recession in 2008, the city-state is at an economic turning point.

 

Click headline to read more--

 


Via Chuck Sherwood, Senior Associate, TeleDimensions, Inc
Ivan Koh's insight:

This article talks about how Singapore's economy has risen that makes Singapore one of the most competitive country in the world. I think that Singapore being a part of the global community is a very crucial thing as most of our economy depends on global issues. We are also able to explore new opportunity with the global world and use them to help in our economy. By being part of the global world, we also are able to include talents from around the world and bolster what Singapore lacks of. Singapore being part of the global world has benefited us strongly and its what keeps our country what is is today. I wonder though what would we do if the regional area that keeps our economy going gets financial problems.

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Teo J-lyn's curator insight, July 3, 2013 3:13 AM

I see that the economy of Singapore has hetting better but recently, the progress hadbecome slower because of many things that happened which hit hard on our economy.Many countries were affected, including Singapore as our economy relies mainly on exports. Despite this, many big organisations and businesses are willing to set up companies and develop in Singapore. I think that there is still alot that Singapore can do and offer despite the challenges it is facing and the limitations it has.Eventhough things may have been slowing down, Singapore still receives offers. The reason Singapore is slowing down is because since Singapore is such a small country, the amount of natural resources we have here is very limited. Despite the limited and small space, Singapore is not affected as there are still people who wants to work and start businesses here. This shows that Singapore has done a great job making itself known to the world, and has already found a space for itself.

Ameer Artsyrup's curator insight, July 5, 2013 10:44 AM

After reading this article, I found out that Singapore's econmy has boomed since its independence. However this is only due as Singapore has traded with other countries in order to survive. On one end, this sounds great as Singapore is thriving due to this but, on the other end, this is also worrying as this clearly shows that Singapore is dependent on other countries in order to survive. This clearly shows us that Singapore is extremely vulnerable. However after ssingapore survived the SARS, H5N1 and the H1N1 period, I believe that the future of this nation is bright.

Evelynkoh's curator insight, July 5, 2013 11:13 AM

As we all know , Singapore is a young nation which has been rediscovered and rebuilt a few years ago. Singapore may be small and that it doesn't have any nature resources but it's position in the world is what makes it stands out. It started of as a port and has slowly been created to how it is now , a successful country , the country which practices meritocracy which is known worldwide. All of these wouldn't have happened if our forefather's didn't protect and built our country well. This is their results of their hard work. However , as it is , Singapore is a very tiny red dot on the globe and is extremely vulnerable to everything that's happening in the world. However , no matter how many crisis we faced we're still standing as strong as ever because we didn't give up , we singaporeans all have a sense of belonging and we all fought and stood with singapore when it was weak. Nowadays , competition is really getting more and more intense as the days , the hours , the minutes and the seconds past. Its like between everyone and everything , there's a competition going on , no matter big or small , all of us are under intense pressure , trying our very best to be the victor. This is why , i hope that this article which is published would make an impact to all its reader's out there , slapping them in their face that they would definitely have to step up and work together to maintain how everything is now. Once they stop and start turning lazy , everything will just go down and i really don't want to think how it will be then. Thus i hope that since singapore has survived so many major crisis , we would forever be like this , the bright and successful nation which everyone looks up to.

Rescooped by Ivan Koh from Success Stories From Across The World
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Success Story of Adolf Dassler, the Founder of Adidas

Success Story of Adolf Dassler, the Founder of Adidas | Possibilities, Conflict and Prejudice Assignment by_Ivan Koh | Scoop.it
Adolf Dassler was the founder of the World’s second biggest sportswear manufacturing company Adidas. His father Christoph worked in a shoe factory and mother ran a laundry service.

Via Amanda Simmons
Ivan Koh's insight:

This article tells me about how Adolf Dassler became the founding father of Adidas, one of the biggest sportswear companies. I think that Adolf Dassler, coming from a working family, was determined to help athletes improve their sportswear so that they can do better in competitions. I think it was his experience from being a cobbler that begun at a very young age and advice from many people and his wanting that has led him to creating shoes with good designs which one day earned popularity from wearers of his brand who won competitions. I wonder though how did industry competitions and conflicts fare with puma and nike being that the founder both came from the same family.

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Thinesh Kannan's curator insight, July 1, 2013 6:05 AM

I can see that Adolf Dassler, the founder of Adidas, was from a poor family and worked really hard because of his passion. His father worked in a shoe factory and mother ran a laundry service. He has been trained as a cobbler from a very early age and he loved experimenting with innovative designs and ideas. He split up with his brother after working in a company together. I wonder why he would split with his brother as they had been working together for so long.

Gautam's curator insight, July 2, 2013 9:08 AM

I think that Adolf Hassler worked really hard because of his passion of shoes and sportswear. It also tells me that you do not need to be rich to be a founder of a major sportswear company.

Evelynkoh's curator insight, July 5, 2013 11:34 AM

Since young , i have believed in a saying that everyone born has a mission to accomplish and that it'll only be accomplished when you work hard for it. Its like a mission and that no matter where or when are you born , the mission will also have to be accomplished before you return to where you came from. Some say , passion , faith and hope is what pushes people on to step up and continue what they're doing and fighting for. You'll have to set a goal for yourself and work hard to accomplish it , find motivations along the way and encourage yourself to keep on going as you may never know what might happen next , you might be just a few steps to your dream, Nothing is impossible as long as you try, Learn from your mistakes and never make them again , learn from it and change along the way , make it better and when time comes , you'll never know how all these bits and pieces in life has helped you gained so much experience and memories that will last a lifetime. Work for your dream , you'll definitely succeed someday in the future, Never give up no matter how hard the road is.

Rescooped by Ivan Koh from The Indigenous Uprising of the British Isles
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Racism is a white man's invention: Indians may be bigoted, prejudiced and ... - Daily Mail

Racism is a white man's invention: Indians may be bigoted, prejudiced and ... - Daily Mail | Possibilities, Conflict and Prejudice Assignment by_Ivan Koh | Scoop.it
Daily Mail
Racism is a white man's invention: Indians may be bigoted, prejudiced and ...
Daily Mail
This is what the piece said: "Though rarely racist, Britons are exceptionally hostile to immigration - more so than Germans, French or the Dutch.

Via Infidel Patriot
Ivan Koh's insight:

This article tells me about the Indians racism to other races and Indians intolerance to others. I think that the nature of this racism to other races is due to prejudice, that many others look down on Indians. If they live in an environment where they are criticized a lot, they will be more racist in their behavior. This racism may also be due to the other races being hostile to the Indians and current stereotypes of them. I wonder if these prejudice continues, what will the society become in India and what will the government do about it.

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Koo Xin Yi's comment, July 2, 2013 1:04 PM
After reading this article, I can see that racism has became a serious issue such that one's attitude to another is based on their race, skin tone, religion etc. I believe that people should not be bias towards one another for it is not what we can decide to be born as. I think that everyone has equal rights to voice out and their views and should be given equal opportunities. Accepting one another for what they are is a basic respect and furthermore, we should be more conscious of others' feelings and thought. I wonder if racism will still be such a big issue in the near future.
Teo J-lyn's curator insight, July 3, 2013 3:31 AM

India is the world's second-most racist country after Jordan. I think that people should be more accepting towards other races,their languages as well as their religion and not be prejudice. It do not matter what colour we are, as we are all humans, and have blood flowing in us. I wonder if racism will continue and is the government going to do anything about it . Racism had also become a serious issue.

Seamus Ong's curator insight, July 5, 2013 8:55 AM

This is my insight using the see-think-wonder routine. From this article I can see that people are being judged by the colour of their skin, accent and other stuff. I see that most races are being judged based on what the minority from the race does like how some act or talk in public and based on that, other racial groups are under the impression that all people of that certain race is like that and they thus sterotype or generalise everyone belonging to that race. this article makes me think that racism is a big problem and one of the main causes of conflict in multienthnic societies like racial riots. I wonder if racism will ever stop.

Rescooped by Ivan Koh from Amazing Science
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Light wheel - new type of light wave extends the possibilities in nanotechnology

Light wheel - new type of light wave extends the possibilities in nanotechnology | Possibilities, Conflict and Prejudice Assignment by_Ivan Koh | Scoop.it

Propeller or wheel? In circularly polarized light, the vector which represents the electric field of the light wave (blue arrows in above figure) rotates helically in the direction of propagation. Such an electromagnetic wave has longitudinal angular momentum. If two circularly polarised waves rotating in opposite directions meet at a focal point, light with purely transverse angular momentum is generated. Its electric field vector rotates about an axis perpendicular to the direction of propagation like a bicycle spoke.

Light in general can exert incredible forces. According to the rules of quantum mechanics, light is an electromagnetic wave, as well as a stream of photons. Since it has momentum, a transparent particle through which a light beam falls experiences a recoil when the photons leave it. Although the force which a photon exerts in this process is almost infinitesimal, the effect of innumerable light particles in intense and tightly focused laser beams adds up in such a way that objects up to a few micrometres can be held in an optical trap or moved in a specific way. Biologists, for example, use this effect in optical tweezers to fix cells and rotate them at the focus of a microscope. To this effect, scientists working with Gerd Leuchs, Director at the Max Planck Institute for the Science of Light, are now creating new possibilities for them.

 

The team has created a photonic wheel, i.e. light with purely transverse angular momentum: the electric field of the electromagnetic wave rotates about an axis whose orientation is perpendicular to the direction of motion, just like the axis of a wheel. Until now, physicists have mainly been familiar with light with longitudinal angular momentum where the electric field rotates like a propeller around an axis aligned along the direction of motion. “The possibility that light can have purely transverse angular momentum when averaged over the complete cross-section of the beam had not been realised before,” says Peter Banzer, who made a significant contribution to the discovery.

 

This is because, as the Erlangen-based physicists have now shown both theoretically and practically, it is indeed possible to generate light with purely transverse angular momentum - and what’s more it is surprisingly easy to do so. “Once it’s down on paper, it looks easy,” says Gerd Leuchs. But somebody has to come up with the idea in the first place. The researchers are now developing this idea using circularly polarised light. A wave of circularly polarised light turns like a screw around the direction of beam propagation and has propeller-like longitudinal angular momentum. Light with circular polarisation can be generated with the aid of a birefringent crystal, for example.


Via Dr. Stefan Gruenwald
Ivan Koh's insight:

This article is about telling that using light manipulation, we may be able to utilise nanotechnology. It goes down into the scientific terms of how its done and how it can be used to benefit other things. I think the factors leading to the realization of reaching the possibilities is mostly still limited to science. One may come up with an idea but if it cannot be proven theoretically or scientifically, then its still far from being a possibility.
I wonder then how some science discovery and breakthrough happened through accidents. 

more...
No comment yet.