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}); </script> </div> <div id="content" class="narrow_content" data-article="20159"> <div id="article_top" class="summary_details">  <div class="sd_top"> <script type="text/javascript">// <![CDATA[ var mobile = (/iphone|ipad|ipod|android|blackberry|mini|windows\sce|palm/i.test(navigator.userAgent.toLowerCase())); if (mobile) { var mob_link = "<img src='https://web.archive.org/web/20120212041657/http://images.gizmag.com/layout/icons/cellphone.png'/><a id='article_mobile_link' class='small' href='https://web.archive.org/web/20120212041657/http://m.gizmag.com/article/20159'>View on mobile site</a>"; $jqr('.sd_top').append(mob_link); } // ]]></script> <a class="small" href="/web/20120212041657/http://www.gizmag.com/researchwatch/" style="float: left; ">RESEARCH WATCH</a> </div> <h2>Event-hiding "temporal cloak" demonstrated</h2> <div class="summary_details_left"> <p>By <a href="/web/20120212041657/http://www.gizmag.com/author/darren-quick/" rel="author">Darren Quick</a></p> <p><em>23:55 October 13, 2011</em></p> </div> <div class="summary_details_right"> <p><img src="https://web.archive.org/web/20120212041657im_/http://images.gizmag.com/layout/icons/comments.png" alt=""/> <a href="#comments">6 Comments</a> </p> <p></p> </div> </div> <div id="hero_box" style="width: 530px;"> <a id="hero_link" href="/web/20120212041657/http://www.gizmag.com/temporal-cloak-demonstrated/20159/picture/144776/"> <img src="https://web.archive.org/web/20120212041657im_/http://images.gizmag.com/hero/time-turning.jpg" title="Cornell researchers have demonstrated a working temporal cloak that creates a gap in the f..." width="530" height="297" alt="Cornell researchers have demonstrated a working temporal cloak that creates a gap in the f..." border="0"/></a><div class="pic_caption"> <p>Cornell researchers have demonstrated a working temporal cloak that creates a gap in the flow of light to conceal events (Image: fdecomite via <a href="https://web.archive.org/web/20120212041657/http://www.flickr.com/photos/21649179@N00/406635986" target="_blank">Flickr</a>) </p> </div> <div class="clear_both"></div> </div> <div class="article_body"> <div id="top_unit"></div> <script type="text/javascript" language="JavaScript"> </script> <script type="text/javascript" language="JavaScript" src="https://web.archive.org/web/20120212041657js_/http://pagead2.googlesyndication.com/pagead/show_ads.js"></script> <p>Last year researchers at Imperial College London proposed that along with being used to cloak physical objects <a href="https://web.archive.org/web/20120212041657/http://www.gizmag.com/tag/metamaterials/" target="_blank">metamaterials</a> could also be used to <a href="https://web.archive.org/web/20120212041657/http://www.gizmag.com/spacetime-cloak-invisible-events/16970/" target="_blank">cloak a singular event in time</a>. A year later, researchers from Cornell University have demonstrated a working "temporal cloak" that is able to conceal a burst of light as if it had never occurred.</p> <p>In a research paper published in the <em>Journal of Optics</em> last year, Prof. Martin McCall and his team at Imperial College London said it should be theoretically possible to create a "Spacetime Cloak" by using metamaterials - a class of artificial materials engineered to have properties not be found in nature - to speed up the leading edge of light waves, while slowing down the trailing half. This would create a "corridor" between the two halves, at which point their source wouldn't be observable.</p> <p>To demonstrate the theory, a Cornell research team led by Moti Fridman sent a beam of light down an optical fiber and passed it through a split-time lens - a silicon device originally designed to speed up data transfer. As the beam passes through the first lens it is compressed, leaving a dead zone or gap in the flow of light. A similar lens further along the path reverses the velocity adjustments, decompressing the light wave so it appears that the light coming through the second lens is uninterrupted as if no distortion had occurred.</p> <p>To test the temporal cloak's performance the researchers created pulses of light directly between the two lenses that repeated like clockwork at a rate of 41 kHz. When the cloak was off, the researchers were able to detect a steady beat, but after switching on the cloak, which was synchronized with the light pulses, it appeared as if the pulses were erased from the data stream.</p> <p>Rather than relying on the properties of metamaterials as was initially proposed by McCall, the temporal cloak demonstrated by the Cornell research team relies on the fundamental properties of light and how it behaves under highly constrained space and time conditions.</p> <p>The length of the cloaked area is a mere six millimeters (0.2 in) long and the effect can only lasts for 110 nanoseconds. The team says the best it can achieve will be 120 microseconds because longer durations would create turbulence in the system that would hint that an event had occurred. To achieve any measurable macroscopic effects would require an experiment on planetary or even interplanetary scales, the researchers say.</p> <p>The <a href="https://web.archive.org/web/20120212041657/http://www.cornell.edu/" target="_blank">Cornell</a> team will present their findings in a presentation "Demonstration of Temporal Cloaking" at the <a href="https://web.archive.org/web/20120212041657/http://www.osa.org/" target="_blank">Optical Society'</a>s Annual Meeting, Frontiers in Optics (FiO) 2011, being held in San Jose, California, next week.</p>  <div id="bottom_unit"> <script type="text/javascript" language="JavaScript"> </script> <script type="text/javascript" language="JavaScript" src="https://web.archive.org/web/20120212041657js_/http://pagead2.googlesyndication.com/pagead/show_ads.js"></script> </div> </div>  <span class="title">Share</span> <div id="article_share" class="dotsontop"> <div class="pw_widget pw_copypaste_false pw_size_24 pw_counter_false"> <a class="pw_googleplus"></a> <a class="pw_facebook"></a> <a class="pw_twitter"></a> <a class="pw_stumble_upon"></a> <a class="pw_title" style="display:none">Event-hiding "temporal cloak" demonstrated</a> <a class="pw_url" style="display:none">http://www.gizmag.com/temporal-cloak-demonstrated/20159/</a> </div> <script src="https://web.archive.org/web/20120212041657js_/http://i.po.st/share/script/post-widget.js#publisherKey=gizmagcom1096" type="text/javascript" charset="utf-8"></script> <fb:like href="http://www.gizmag.com/temporal-cloak-demonstrated/20159/" send="false" width="450" show_faces="false" font="" id="facebook_like"></fb:like><script type="text/javascript">_ga.trackFacebook();</script> </div>   <div id="tags"> <span class="title">Tags</span> <div class="dotsontop"> <ul> <li>» <a href="/web/20120212041657/http://www.gizmag.com/tag/cloaking/" rel="tag">Cloaking</a></li> <li>» <a href="/web/20120212041657/http://www.gizmag.com/tag/cornell/" rel="tag">Cornell</a></li> <li>» <a href="/web/20120212041657/http://www.gizmag.com/tag/light/" rel="tag">Light</a></li> <li>» <a href="/web/20120212041657/http://www.gizmag.com/tag/optical/" rel="tag">Optical</a></li> <li>» <a href="/web/20120212041657/http://www.gizmag.com/tag/time/" rel="tag">Time</a></li> <li class="clear_both"></li> </ul> </div> </div> <div id="bing_unit"></div>  <span class="title" id="comments">User Comments (6)</span> <div class="dotsontop" id="comment_dots">  <div id="comment-85600" class="a_comment"> <p>Wow..cloaking Space-time events...invisibility cloaks.. succesful animal brain transplants..instilling life to inorganic matter.. reversing cellular aging.. and letsnot forget the handheld 'communicators' or 'globals' a la 'Earth Final Conflict' (smartphones) </p> <p>This story is just another in a long line that clearly shows we're stepping into 'Star Trek' territory indeed.. </p> <p>Some theme music if you please... </p> <img src="https://web.archive.org/web/20120212041657im_/http://images.gizmag.com/layout/icons/comment.png" alt="comment"> <span class="name">sgdeluxedoc</span> <span class="date">- October 14, 2011 @ 05:11 am PDT</span> <div class="clear_both"></div> </div> <div id="comment-85639" class="a_comment"> <p>One of the biggest problems in pop science reporting has to be trying to translate the screwy idioms that are so popular with scientists. "Cloak a singular event in time" sounds like they're doing something naughty with relativity, when in fact it seems they are just messing around with light frequencies- and on a very insignificant scale. </p> <img src="https://web.archive.org/web/20120212041657im_/http://images.gizmag.com/layout/icons/comment.png" alt="comment"> <span class="name">Duane Phillips</span> <span class="date">- October 14, 2011 @ 06:29 am PDT</span> <div class="clear_both"></div> </div> <div id="comment-85669" class="a_comment"> <p>"researchers from Cornell University have demonstrated a working "temporal cloak" that is able to conceal a burst of light as if it had never occurred." </p> <p></p> <p>And if I cover my eyes, it's as if nothing happens anywhere!? </p> <img src="https://web.archive.org/web/20120212041657im_/http://images.gizmag.com/layout/icons/comment.png" alt="comment"> <span class="name">Stephen Dunn</span> <span class="date">- October 14, 2011 @ 09:43 am PDT</span> <div class="clear_both"></div> </div> <div id="comment-85720" class="a_comment"> <p>I have a feeling that this might someday play an interesting role in light-wave data encryption. </p> <img src="https://web.archive.org/web/20120212041657im_/http://images.gizmag.com/layout/icons/comment.png" alt="comment"> <span class="name">kalqlate</span> <span class="date">- October 14, 2011 @ 12:03 pm PDT</span> <div class="clear_both"></div> </div> <div id="comment-85846" class="a_comment"> <p>On interplanetary scales, I suggest hiding behind a nearby moon whenever you need to have a talk with your secret friends. It will be much easier, and no one will ever find out. </p> <img src="https://web.archive.org/web/20120212041657im_/http://images.gizmag.com/layout/icons/comment.png" alt="comment"> <span class="name">ralph.dratman</span> <span class="date">- October 15, 2011 @ 03:44 pm PDT</span> <div class="clear_both"></div> </div> <div id="comment-85936" class="a_comment"> <p>Great! Humans go one better - with lying! LOL </p> <img src="https://web.archive.org/web/20120212041657im_/http://images.gizmag.com/layout/icons/comment.png" alt="comment"> <span class="name">Da Zavros</span> <span class="date">- October 16, 2011 @ 07:17 pm PDT</span> <div class="clear_both"></div> </div> </div> <span class="title">Post a Comment</span> <div class="dotsontop" id="comment_form_div"> <div id="comment_form" data-article="20159"> <div id="comments_login"> <form action="" style="clear: both; padding-top: 0px;" name="login_form" id="login_form" onsubmit="return false;"> <p><strong>Login with your gizmag account:</strong></p> <p id="login_status"></p> <label for="email">Email</label><input type="text" class="text" name="email" id="email" value=""/><br/><br/> <label for="password">Password</label><input type="password" class="text" name="password" id="password" value=""/><br/> <div> <input type="submit" style="float: right" id="submit" value="Log In"/> <div id="options"> <a 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