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		</div><p><a href="http://londonglossy.com/wp-content/uploads/2010/12/worlds-smallest-christmas-card.jpg"><img class="alignnone size-full" title="The Christmas card is so small that more than 8,000 of them could fit on a first-class stamp" src="http://londonglossy.com/wp-content/uploads/2010/12/min-worlds-smallest-christmas-card.jpg" alt="The Christmas card is so small that more than 8,000 of them could fit on a first-class stamp"/></a></p>
<p>Nanotechnology experts have unveiled a Christmas card so small that more than 8,000 of them could fit on a first-class stamp.</p>
<p>The card produced by the University of Glasgow, said to be the smallest in the world, is invisible to the naked eye.</p>
<p>The university&#8217;s school of engineering drew up the design to highlight its &#8220;world-leading&#8221; nanotechnology expertise.</p>
<p>A total of 8,276 of the cards could be placed on an area the size of a stamp.</p>
<p>Professor David Cumming and Dr Qin Chen etched the Christmas tree image on to a minute piece of glass.</p>
<p>Prof Cumming said: &#8220;Our nanotechnology is among the best in the world but sometimes explaining to the public what the technology is capable of can be a bit tricky. We decided that producing this Christmas card was a simple way to show just how accurate our technology is.</p>
<p>&#8220;The process to manufacture the card only took 30 minutes. It was very straightforward to produce as the process is highly repeatable &#8211; the design of the card took far longer than the production.</p>
<p>&#8220;The card is 200 micro-metres wide by 290 micro-metres tall. To put that into some sort of perspective, a micro-metre is a millionth of a metre; the width of a human hair is about 100 micro-metres. You could fit over half a million of them on to a standard A5 Christmas card &#8211; but signing them would prove to be a bit of a challenge.&#8221;</p>
<p>The colours were produced by a process known as plasmon resonance in a patterned aluminium film made in the university&#8217;s James Watt Nanofabrication Centre.</p>
<p>Although the Christmas card example is a simple demonstration, the university said the underlying technology has important real-world applications.</p>
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