Interaction between Light and Sound in Nanoscale Waveguide

Interaction between Light & Sound – Nanoscale Area

Scientists of Belgium from Ghent University and Nano-electronics research institute, Imec, had a demonstration on the interaction between light and sound in a nanoscale area and their discovery published in the Nature Photonics indicate that the physics of light matter coupling at the level of nanoscale, has paved the way for enhanced signal process on mass producible silicon photonic chips.

The field of silicon in the last decade has attracted increased attention as a driver of lab-on-a-chip biosensors as well as of faster-than-electronics communication between the computer chips. The technology has been built on nanoscale structures which are called silicon photonic wires that are roughly hundred times narrower than human hair and these nanowires tend to carry optical signal from one point to another at the speed of light and are developed with the same technology to fabricate electronic circuitry.

 The wires tends to operate since light moves slower in the silicon core than the surrounding air and glass and due to the trapped light in the wire by the phenomenon of total internal reflection.

Sound Moves Quicker in Silicon Wires 

Confining light simply is one thing though manipulating it is another and the problem is that one light beam cannot change easily the properties of another. It is here that the light matter interaction is in focus which enables some photons to control the other photons.

Researchers from Imec as well as the Photonics Research Group of Ghent University portrayed a peculiar form of light matter interaction and managed to confine light as well as sound to the silicon nanowires where the sound oscillates ten billion times per second which is far more rapid that human ears can hear. They realized that the sound cannot remain trapped in the wire by total internal reflection and unlike light; sound tends to move much quicker in the silicon core than the surrounding air and glass.

The scientistsframed the environment of the core in order to make sure any vibrational wave intending to escape it would eventually bounce back and in doing so, they confined light as well as sound to the same nanoscale waveguide core, a first observation.

Light & Vibration Influence Each Other 

Light and vibrations strongly influenced each other when trapped in an incredibly small area, where light tends to generate sound and sound shifts the colour of light which is a process known as stimulated Brillouin scattering.

They exploited the interaction in order to amplify specific colour of light, anticipating that the demonstration would open up new ways in manipulating optical information such as light pulses could be converted into sonic pulses and back into light, by implementing the much needed delay lines.

Moreover the researchers are expecting that the similar techniques could also be applied to even smaller entities like viruses and DNA since these particles tend to have unique acoustic vibration which could be used to probe their global structure.

Telescopic Contact Lenses Could Magnify Human Eyesight

Telescopic Lens – Magnifying Objects – 2.8 Times

Interesting development have been coming up in the world of contact lenses with scientists making great headways in creating a pair of `smart lenses for diabetic who are capable of monitoring glucose levels as well as Google inventing a set with an in-built cameras. We now have optics researchers from Sweden, developing contact lenses which can zoom in on an object at the blink of an eye where a simple wink tends to activate the telescopic lens and help people to read as well as recognize faces easily.

The prototype lenses which was unveiled recently at the American Association for the Advancement of Science annual meeting helps in magnifying objects up to 2.8 times and probably someday could be useful for those with visual impairment affecting around 285 million people all over the world.

This could be helpful for those with a condition known as age-related macular degeneration –AMD which is a major cause of blindness as well as visual impairment in older people beyond the age of 50. AMD is a progressive condition wherein the person tends to lose their central vision gradually due to cell damage and death in the retina.

Enhanced Design 

Though glasses known as bioptic telescopes are available to help them with this condition, they tend to be bulky and interfere with social interaction and this latest design seems to be less intrusive. The telescopes are inbuilt in the lenses and were first developed with funding from DARPA as super thin cameras for aerial drone, though they were then converted into vision enhancing system and was first unveiled in 2013.

They were not quite suitable for eyeballs for instance the magnification which was always on, had to be deactivated by taking them out. Besides this, the original lenses were not gas permeable and hence could not be worn for very long. Two years later, the development team led by Eric Tremblay of Swiss Federal Institute of Technology in Lausanne has now enhanced the design and they are of the belief that the telescopic lenses can be tried for humans which has been only tested on a mechanical model so far.

Updated PrototypeFeatures 

The updated prototype features small air channels which enables oxygen flow through the underside of the lens in order to eliminate eye irritation. The lenses are larger and rigid than the standard lens which covers the sclera or white area of the eyes and within the 1.5 mm thick lenses, a ring of tiny aluminium mirrors which bounces light around and increases the visualized size of the image magnifies it 2.8 times.

According to science, in order to switch between the zoomed and normal vision, the user needs to wink their right eye that interrupts the light from being reflected from the contacts to the glasses.When this signal is block, the polarized filter in the glasses kicks in and guides lights in the telescopic area and to get back to normal vision one needs to wink their left eye.

It is not certain when these future lenses would come in the market though science is making changes in viewing the world.

Facebook Will Soon Be Able to ID You in Any Photo

Facebook’s DeepFace System

When one appears in a photo taken at any event, they are recognized most of the time but a machine may fail to do so unless a computer has been programmed to look for you and has been trained on several photos of the face with high quality images to examine you.

However, in Facebook, where one will find the largest collection of personal photographs, the technology is making some headway in that direction. The California based company besides several other corporate players in the field – Facebook’s DeepFace System, is presently as accurate as a human being with few constrained facial recognition tasks. According to Yann LeCun, a computer scientist at New York University in New York City directing Facebook’s artificial intelligence research, states that the purpose is not to intrude on the privacy of Facebook user which is more than 1.3 billion active users but to protect it.

When DeepFace tends to identify a face in one of the 400 million new photos which the users upload daily, ‘one will get an alert from Facebook informing them of their appearance in the picture. The user then has the option to blur their image from the picture in order to protect their privacy.

Automated Facial Recognition – Usage/Limitation - Unknown

Most of the people tend to get disturbed on being identified particularly in stranger’s pictures and Facebook has already begun using the system though its face tagging system reveals only the identities of their friends. Besides DeepFace, the U.S government has also been funding in university based facial recognition research while others in the private sectors, like Google together with other companies are proceeding with their own projects to identify individuals automatically who tend to appear in videos and photos.

How automated facial recognition will be used and its limitation on the law is unknown though once the technology takes shape it would create many privacy problems as it solves. Brian Mennecke, an information systems research at Iowa State University in Ames, studying privacy states `the genie is or soon will be out of the bottle and there will be no going back’.

Social Face Classification 

LeCun comments that identifying a face could be much harder problem than detecting it which unlike fingerprints constantly tends to change. By just a smile, the face gets transformed where the corners of the eyes wrinkle, nostrils flare and the teeth are seen. When the head is thrown back with laughter, the apparent shape of the face contorts and when one has the same expression, the hair varies from each photo particularly after a visit to a hair dresser.

Yet most of them are recognized without any effort even if they have been seen in just one photo. The greatest advantage of DeepFace and the aspect of the project which sparked off is its training data. The DeepFace paper mentions the presence of a data set called SFC – Social Face Classification, which is a library of 4.4 million labelled faces taken from the Facebook pages of 4030 users and though users have given permission to Facebook to use their personal data on signing up for the website, DeepFace research paper does not make a mention on the consent of the owner’s photos.

Net Neutrality

Net Neutrality – Guiding Principle of Internet

Net Neutrality is the guiding principle of Internet and preserves our right to freely communicate online which is defined as an open Internet. It is the principle that all Internet traffic should be treated equally.In other words it means an Internet which allows and protects free speech wherein the internet provider provides the user with open networks and should not block or discriminate against any content or application which rides over the networks.

It is the principle which Internet service providers as well as government should treat the data on the internet equally without discriminating or making any charges differentially by user, site, content, platform, and application, type of attached equipment or mode of communication. Tim Wu, Professor of Columbia Law School states that the best way to explain network neutrality could be as a principle which could be used while designing a network which a public information network could end up being useful for all content, sites and platform, are equally treated.

Absence of Net Neutrality 

With the absence of Net Neutrality, phone and cable companies could carve the internet in fast and slow lanes while an ISP could slow down its rivals’ content or block political views disagreed upon. ISPs could also charge additional fees to the few content companies which could afford to pay for preferred treatments reducing the others to a slower tier of service thereby affecting the open internet.

Several debates are on with regards to Net Neutrality being required by law, especially in the United States. Lawrence Lessig, advocate of net neutrality has raised concern with regards to the ability of broadband provider using their last mile infrastructure to block Internet applications as well as content and to block out competitors. Neutrality advocate claims that the telecom companies need to impose a tiered service model to control and remove competitors, create artificial scarcity as well as oblige subscribers to purchase other uncompetitive services.

Important as Preservation 

Many are of the opinion that net neutrality is primarily important as preservation for current freedom and prominent supporter of net neutrality comprises of Vinton Cert, co-inventor of the Internet Protocol as well as Tim Berners-Lee, creator of the Web.

It is crucial for small business owners, entrepreneurs as well as for start-ups, who tend to depend on the open internet in order to launch their business, advertise their products and services, create a market, and distribute products to their customers. The need of open Internet is essential for job growth, competition as well as innovation.

It also tends to lower the obstacle of entry for entrepreneurs, start-ups and the small businesses by making sure that the Web is a fair and a level playing ground and the internet is used to reach the audiences and showcase their goods, services and applications. Interference from any company should not be permitted with this open marketplace. According to definition, ISPs are the gatekeepers to the Internet wherein without the Net Neutrality; they would take then every possible opportunity in order to profit from the gatekeeper control.

Microsoft's Outlook App for iOS is better than Gmail

Microsoft’s new e-mail app, which is exclusively for iOS was released at the end of January 2015 and it seems that Microsoft’s Outlook app is getting a lot of positive reviews in terms of function and look as this app supports Yahoo-Mail, Gmail, Exchange and more with inbuilt calendar syncs. It is expected that this app will be better alternative of Gmail’s official app on iOS platform.

According to anonymous users Microsoft’s Outlook app deserves hype because after installing and using this app I’ve not felt the need to use Gmail app since then. Yes, it is true that there are scopes for few improvements as Gmail and Inbox by Gmail is better in categorizing mails.

While using this app I felt that sometimes it doesn’t show most relevant contacts and to find any specific contact you might have to scroll a lot. In Microsoft’s Outlook app account setting is pretty easy. If you wish to set up multiple accounts, so you can do same in one app and as per wish you can view each inbox separately or together. This app is good enough to cover all the major e-mail service providers such as; Yahoo, Box, Exchange, Dropbox, Outlook, Exchange, iCloud, OneDrive and Gmail and with this facility you can sync your Gmail and Office mail at the same time in same app.

This app also allows you to set different swiping gestures for every e-mail as you can swipe an email from left to right. If you have subscribe for many different website or getting a lot of emails from different websites, so sometimes it becomes tedious task to hunt for important mails, but with this app you can bundle them into one particular coherent group as per the content of mail. Same as Gmail, which is good enough to categorizes emails into different tabs such as; Promotions, Primary, Updates, Group or Inbox, it has Focus inbox that has emails from your colleagues and as well as personal contacts.

The other tabs are useful to keep the record of emails from Twitter, Facebook, your bank bill, Amazon and your purchases, but the good thing is that it keep Focus tab clean and simple. Apart from basic features, you can set Mark as Read¸ None, Flag, Delete, Schedule, Move, Archive and more. The other interesting feature is that if you have gotten some annoying email, so you will get the freedom to delete it straight from the notification bar.

This new app will help you to make the good use of extensions feature in iOS8 because it let you to share the files and attachment in another supporting app. This app have automatically sync feature with your iOS and Google calendar as well, which make it’s pretty convenient to schedule meeting or events. In emails separate tab showcase all the files and attachment, but the best thing is that it will syncs with Dropbox and Google Drive as well, whereas; on slide menu on left side you can see the Birthday, Holidays in India, Contacts’ and more in the calendar as well and this feature can be pretty important and useful for users in India.