Lecture 17 - Alternative plasmonic materials (student presentation)

Lecture 17- - 1 ECE-695S(2009 Student presentation Stonehenge prehistoric monument in England said to be built by the end of stone age 2

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Unformatted text preview: 12/10/2009 1 ECE-695S (2009) Student presentation Stonehenge : prehistoric monument in England said to be built by the end of stone age 12/10/2009 2 ECE-695S (2009) Student presentation 12/10/2009 ECE-695S (2009) Student presentation 3 Shaman’s Rattles from Bronze age 12/10/2009 ECE-695S (2009) Student presentation 4 Weapons from from Iron age 12/10/2009 ECE-695S (2009) Student presentation 5 . . . now, 12/10/2009 6 Intel’s Single Chip Cloud Processor containing 48 cores 12/10/2009 ECE-695S (2009) Student presentation 7 J.R. Krenn et al., Europhys.Lett. 60, 663 (2002) Oct 22, 2009 Intel turns to photonics to extend Moore's law Intel's Photonics Technology Laboratory in California is showing how optics may one day enable computer-chip designers to overcome the fundamental limitations of electronics. Breck Hitz talks to the lab's director, Mario Paniccia. Courtesy: optics.org Courtesy: Prof. M. Brongersma 12/10/2009 8 ECE-695S (2009) Student presentation What’s the problem? Losses! 12/10/2009 9 ECE-695S (2009) Student presentation 12/10/2009 10 ECE-695S (2009) Student presentation • Losses in materials, especially in near-IR and visible spectra • Emerging innovative fields such as Transformational Optics have different requirements: • Require effective permittivity nearly zero: e.g. optical cloaks, hyperlens etc. • Real permittivity of metals must be comparable to that of dielectrics 12/10/2009 11 ECE-695S (2009) Student presentation • Losses in materials: mechanisms & significance • Review of metals: Gold, Silver, Copper, Aluminum, Platinum, Palladium, Nickel • Noble-Transition metal alloys, Alkali metals, Noble- Alkali metal alloys • Semiconductors: Silicon, GaAs, InSb etc. • Transparent Conducting Oxides • Graphene • Comparative study: Quality factors • Conclusions • Molecular rotations/vibrations • Phonons • Exciton generation • Impurities & defects • Intraband losses • Interband transitions • Photoelectron generation • Auger absorption • Compton effect • Pair production AA Sokol et al., Faraday Discussions , 134, 267 (2007) 12/10/2009 12 ECE-695S (2009) Student presentation ) ( . ) ( " ' ) ( 2 2 2 2 2 2 int p p i i * * , * 2 2 2 m e m ne m ne o o p P. B. Johnson and R. W. Christy, Phys. Rev. B 6 , 4370 (1972). 12/10/2009 13 ECE-695S (2009) Student presentation • Free electron losses • At a given ω , smaller Г and smaller ω p lower losses • m * and Г are not independent of frequency! • Electron-hole pair production by absorption of photon • Introduce significant losses in metals • reason why copper is reddish, gold is yellow, silver is grayish white … E F k E E F k E 12/10/2009 14 ECE-695S (2009) Student presentation ) ( 2 2 2 k kn n k E D E W Fermi’s golden rule : Rate of absorption per volume: k k n k k E E dE E W E D F F ) ( ) (...
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This note was uploaded on 01/10/2011 for the course ECE 695s taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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Lecture 17- - 1 ECE-695S(2009 Student presentation Stonehenge prehistoric monument in England said to be built by the end of stone age 2

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