Explaining A Plasmon Version of Young's Experiment. = -- Physics News Update 839

From: "Saved by Windows Internet Explorer 7" Subject: Explaining A Plasmon Version of Young's Experiment. -- Physics News Update 839 Date: Mon, 8 Oct 2007 15:15:07 +0200 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01C809BE.02B54710" X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16480 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C809BE.02B54710 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.aip.org/pnu/2007/split/839-3.html Explaining A Plasmon Version of Young's Experiment. = -- Physics News Update 839

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=B7 PNU = Archives=20
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Number 839 #3, September 17 = ,=20 2007 by Phil Schewe

Explaining A Plasmon Version of = Young's=20 Experiment.

When light strikes a metallic array of subwavelength = apertures=20 surface plasmons may be created. An electromagnetic phenomenon = like=20 light itself, the plasmons propagate in the plane of the metal = but with=20 a wavelength smaller, sometimes appreciably smaller, than the=20 illuminating light. Just as light can couple to surface = plasmons, these=20 plasmons propagating between apertures can also be reconstituted = as=20 light. The overall effect is that =93large=94 light can pass = through tiny=20 holes.

If now the number of openings is limited to two, then one has = the=20 makings of a plasmonic version of the famous Young's experiment, = the=20 early nineteenth-century experiment in which light falling on = two slits=20 in a baffle produced an interference pattern---revealing the = wave nature=20 of light. A number of experiments have now been performed on = exactly=20 this version of Young's experiment. At the Frontiers in Optics = meeting=20 C.H. Gan of the University of North Carolina (Charlotte) reports = on some=20 new theoretical predictions relating to the coherence properties = of=20 light transmitted through the slits.

His detailed simulations, done with collaborators G. Gbur of = UNC=20 Charlotte and T.D. Visser of the Free University of Amsterdam, = show how=20 surface plasmons traveling between the apertures result in a = correlation=20 of the light fields emitted from the apertures. Gan (chgan@uncc.edu) shows how = this effect=20 can be tuned (such as by varying the size or spacing of the = slits) to=20 achieve varying degrees of spatial coherence (that is, the = amount by=20 which the waves are =93in step=94) of the emergent reconstituted = light=20 waves. This tunability in turn has the potential to be exploited = in new=20 forms of coherence-relating imaging, such as 'variable coherence = scattering microscopy.

Back to Physics News=20 Update

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