Name: design, fabrication, and experimental characterization of plasmonic photoconductive terahertz emitters
Uploaded: 2013-07-08T13:00:00
Description: Watch this Scientific Journal Video about Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters at JoVE.com

Forfatterne vil gerne takke Picometrix for at levere de LT-GaAs substrat og taknemmeligt anerkende den økonomiske støtte fra Michigan Space Grant Consortium, DARPA Young Faculty Award forvaltes af Dr. John Albrecht (kontrakt # N66001-10-1-4027), NSF KARRIERE Award forvaltes af Dr. Samir El-Ghazaly (kontrakt # N00014-11-1-0096), ONR Young Investigator Award forvaltes af Dr. Paul Maki (kontrakt # N00014-12-1-0947), og ARO Young Investigator Award forvaltes af Dr. Dev Palmer (kontrakt # W911NF-12-1-0253).

1.. Plasmoniske Photoconductive Emitter Fabrication <ol><li> Fabrikere plasmoniske riste. <ol><li> Rengør halvlederskiven ved nedsænkning i acetone (2 min) efterfulgt af isopropanol (2 min), og skylning med deioniseret vand (10 sek). </li><li> Tør prøven med nitrogen og varmes på en varmeplade ved 115 ° C i 90 sekunder for at fjerne eventuelt resterende vand. </li><li> Spin MICROCHEM 950K PMMA A4 på prøven ved 4.000 rpm i 45 sek. Forbag ​​modstå på en varmeplade ved 180 ° C i 3 minutter. </li><li> Indl?...

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	<li>Preu, S., Dohler, G. H., Malzer, S., Wang, L. J., Gossard, A. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tunable,+continuous-wave+terahertz+photomixer+sources+and+applications.">Tunable, continuous-wave terahertz photomixer sources and applications.</a> J. Appl. Phys. 109, 061301 (2011).</li><li>Bjarnason, J. E., Chan, T. L. J., Lee, A. W. M., Brown, E. R., Driscoll, D. C., Hanson, M., Gossard, A. C., Muller, R. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=ErAs:GaAs+photomixer+with+two-decade+tunability+and+12+&#956;W+peak+output+power.">ErAs:GaAs photomixer with two-decade tunability and 12 &#956;W peak output power.</a> Appl. Phys. Lett. 85, 3983-3985 (2004).</li><li>Peytavit, E., Lepilliet, S., Hindle, F., Coinon, C., Akalin, T., Ducournau, G., Mouret, G., Lampin, J. -. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Milliwatt-level+output+power+in+the+sub-terahertz+range+generated+by+photomixing+in+a+GaAs+photoconductor.">Milliwatt-level output power in the sub-terahertz range generated by photomixing in a GaAs photoconductor.</a> Appl. Phys. Lett. 99, 223508 (2011).</li><li>Upadhya, P. C., Fan, W., Burnett, A., Cunningham, J., Davies, A. G., Linfield, E. H., Lloyd-Hughes, J., Castro-Camus, E., Johnston, M. B., Beere, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Excitation-density-dependent+generation+of+broadband+terahertz+radiation+in+an+asymmetrically+excited+photoconductive+antenna.">Excitation-density-dependent generation of broadband terahertz radiation in an asymmetrically excited photoconductive antenna.</a> Opt. Lett. 32, 2297-2299 (2007).</li><li>Roehle, H., Dietz, R. J. B., Hensel, H. J., B&#246;ttcher, J., K&#252;nzel, H., Stanze, D., Schell, M., Sartorius, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Next+generation+1.5+&#956;m+terahertz+antennas:+mesa-structuring+of+InGaAs/InAlAs+photoconductive+layers.">Next generation 1.5 &#956;m terahertz antennas: mesa-structuring of InGaAs/InAlAs photoconductive layers.</a> Opt. Express. 18, 2296-2301 (2010).</li><li>Taylor, Z. D., Brown, E. R., Bjarnason, J. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Resonant-optical-cavity+photoconductive+switch+with+0.5+%+conversion+efficiency+and+1.0W+peak+power.">Resonant-optical-cavity photoconductive switch with 0.5 % conversion efficiency and 1.0W peak power.</a> Opt. Lett. 31, 1729-1731 (2006).</li><li>Park, S. -. G., Jin, K. H., Yi, M., Ye, J. C., Ahn, J., Jeong, K. -. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Enhancement+of+Terahertz+Pulse+Emission+by+Optical+Nanoantenna.">Enhancement of Terahertz Pulse Emission by Optical Nanoantenna.</a> ACS NANO. 6, 2026-2031 (2012).</li><li>Auston, D. H., Cheung, K. P., Smith, P. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Picosecond+photocoducting+Hertzian+dipoles.">Picosecond photocoducting Hertzian dipoles.</a> Appl. Phys. Lett. 45, 284-286 (1984).</li><li>Berry, C. W., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Terahertz+generation+using+plasmonic+photoconductive+gratings.">Terahertz generation using plasmonic photoconductive gratings.</a> New Journal of Physics Focus Issue on Terahertz Plasmonics. 14, 105029 (2012).</li><li>Berry, C. W., Hashemi, M. R., Unlu, M., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Significant+Radiation+Enhancement+in+Photoconductive+Terahertz+Emitters+by+Incorporating+Plasmonic+Contact+Electrodes.">Significant Radiation Enhancement in Photoconductive Terahertz Emitters by Incorporating Plasmonic Contact Electrodes.</a> arXiv. , 1209.1680v1 (2012).</li><li>Berry, C. W., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ultrafast+Photoconductors+based+on+Plasmonic+Gratings.">Ultrafast Photoconductors based on Plasmonic Gratings.</a> Proc. Int. Conf. Infrared, Millimeter, and Terahertz Waves. , 1-2 (2011).</li><li>Berry, C. W., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Plasmonically-enhanced+localization+of+light+into+photoconductive+antennas.">Plasmonically-enhanced localization of light into photoconductive antennas.</a> Proc. Conf. Lasers and Electro-Optics. , CFI2 (2010).</li><li>Berry, C. W., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Principles+of+impedance+matching+in+photoconductive+antennas.">Principles of impedance matching in photoconductive antennas.</a> Journal of Infrared, Millimeter and Terahertz. , (2012).</li><li>Ralph, S. E., Grischkowsky, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Trap-enhanced+electric+fields+in+semi-insulators:+The+role+of+electrical+and+optical+carrier+injection.">Trap-enhanced electric fields in semi-insulators: The role of electrical and optical carrier injection.</a> Appl. Phys. Lett. 59, 1972 (1991).</li><li>Upadhya, P. C., Fan, W., Burnett, A., Cunningham, J., Davies, A. G., Linfield, E. H., Lloyd-Hughes, J., Castro-Camus, E., Johnston, M. B., Beere, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Excitation-density-dependent+generation+of+broadband+terahertz+radiation+in+an+asymmetrically+excited+photoconductive+antenna.">Excitation-density-dependent generation of broadband terahertz radiation in an asymmetrically excited photoconductive antenna.</a> Opt. Lett. 32, 2297-2299 (2007).</li><li>Taylor, Z. D., Brown, E. R., Bjarnason, J. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Resonant-optical-cavity+photoconductive+switch+with+0.5+%+conversion+efficiency+and+1.0W+peak+power.">Resonant-optical-cavity photoconductive switch with 0.5 % conversion efficiency and 1.0W peak power.</a> Opt. Lett. 31, 1729-1731 (2006).</li><li>Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Terahertz+radiation-band+engineering+through+spatial+beam-shaping.">Terahertz radiation-band engineering through spatial beam-shaping.</a> Photonic Technology Letters. 21, 2019620 (2009).</li><li>Jarrahi, M., Lee, T. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High+power+tunable+terahertz+generation+based+on+photoconductive+antenna+arrays.">High power tunable terahertz generation based on photoconductive antenna arrays.</a> Proc. IEEE International Microwave Symposium. , 391-394 (2008).</li><li>Beck, M., Schafer, H., Klatt, G., Demsar, J., Winnerl, S., Helm, M., Dekorsy, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Impulsive+terahertz+radiation+with+high+electric+fields+from+an+amplifier-driven+large-area+photoconductive+antenna.">Impulsive terahertz radiation with high electric fields from an amplifier-driven large-area photoconductive antenna.</a> Opt. Express. 18, 9251-9257 (2010).</li><li>Hattori, T., Egawa, K., Ookuma, S. I., Itatani, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intense+terahertz+pulses+from+large-aperture+antenna+with+interdigitated+electrodes.">Intense terahertz pulses from large-aperture antenna with interdigitated electrodes.</a> Jpn. J. Appl. Phys. 45, L422-L424 (2006).</li><li>Kim, J. H., Polley, A., Ralph, S. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficient+photoconductive+terahertz+source+using+line+excitation.">Efficient photoconductive terahertz source using line excitation.</a> Opt. Lett. 30, 2490-2492 (2005).</li><li>Dreyhaupt, A., Winnerl, S., Dekorsy, T., Helm, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High-intensity+terahertz+radiation+from+a+microstructured+large-area+photoconductor.">High-intensity terahertz radiation from a microstructured large-area photoconductor.</a> Appl. Phys. Lett. 86, 121114 (2005).</li><li>Brown, E. R., Lee, A. W. M., Navi, B. S., Bjarnason, J. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterization+of+a+planar+self-complementary+square-spiral+antenna+in+the+THz+region.">Characterization of a planar self-complementary square-spiral antenna in the THz region.</a> Microwave Opt. Technol. Lett. 48, 524-529 (2006).</li><li>Huo, Y., Taylor, G. W., Bansal, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Planar+log-periodic+antennas+on+extended+hemishperical+silicon+lenses+for+millimeter/submillimeter+wave+detection+applications.">Planar log-periodic antennas on extended hemishperical silicon lenses for millimeter/submillimeter wave detection applications.</a> Int. J. Infrared and Millimeter Waves. 23, 819 (2002).</li><li>Heshmat, B., Pahlevaninezhad, H., Pang, Y., Masnadi-Shirazi, M., Lewis, R. B., Tiedje, T., Gordon, R., Darcie, T. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Nanoplasmonic Terahertz Photoconductive Switch on GaAs. Nano Lett. 12, 6255-6259 (2012).</li><li>Berry, C. W., Hashemi, M. R., Unlu, M., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Significant+Performance+Enhancement+in+Photoconductive+Terahertz+Optoelectronics+by+Incorporating+Plasmonic+Contact+Electrodes.">Significant Performance Enhancement in Photoconductive Terahertz Optoelectronics by Incorporating Plasmonic Contact Electrodes.</a> Nature Communications. 4, 1622 (2013).</li><li>Wang, N., Berry, C. W., Hashemi, M. R., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Plasmonic+photoconductive+detectors+for+enhanced+terahertz+detection+sensitivity.">Plasmonic photoconductive detectors for enhanced terahertz detection sensitivity.</a> Optics Express. , (2013).</li><li>Hsieh, B. -. Y., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+periodic+metallic+nano-slits+for+efficient+interaction+of+terahertz+and+optical+waves+at+nano-scale+dimensions.">Analysis of periodic metallic nano-slits for efficient interaction of terahertz and optical waves at nano-scale dimensions.</a> J. Appl. Phys. 109, 084326 (2011).</li><li>Hsieh, B. -. Y., Wang, N., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Toward+Ultrafast+Pump-Probe+Measurements+at+the+Nanoscale.+Special+Issue+of+"Optics+in+2011.">Toward Ultrafast Pump-Probe Measurements at the Nanoscale. Special Issue of "Optics in 2011.</a> Optics &amp; Photonics News. 22, (2011).</li><li>Hsieh, B. -. Y., Jarrahi, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simultaneous+focusing+of+terahertz+and+optical+waves+into+nano-scale.">Simultaneous focusing of terahertz and optical waves into nano-scale.</a> Proc. Int. Conf. Infrared, Millimeter, and Terahertz Waves. , 1-2 (2011).</li><li>Jackson, A. W., Ibbetson, J. P., Gossard, A. C., Mishra, U. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reduced+thermal+conductivity+in+low-temperature+grown+GaAs.">Reduced thermal conductivity in low-temperature grown GaAs.</a> Appl. Phys. Lett. 74, 2325-2327 (1999).</li></ol>

I denne video artikel præsenterer vi en ny fotoledende terahertz generation teknik, der bruger en plasmoniske kontakt elektrode konfiguration til at forbedre den optiske-til-terahertz konvertering effektivitet ved to størrelsesordener. Den betydelige stigning i terahertzstråling strøm fra de præsenterede plasmoniske fotoledende udledere er meget værdifuld for den fremtidige højfølsom terahertz billedbehandling, spektroskopi og spektrometri systemer, der anvendes til avanceret kemisk identifikation, medicinsk bil...

Vi præsenterer en roman fotoledende terahertz emitter, der bruger en plasmoniske kontakt elektrode konfiguration til at forbedre den optiske-til-terahertz konvertering effektivitet ved to størrelsesordener. Vores teknik adresser de mest vigtige begrænsninger af konventionelle Photoconductive terahertz udledere, nemlig lav udgangseffekt og dårlig strømeffektivitet, der stammer fra den iboende tradeoff mellem høj kvante effektivitet og ultrahurtig drift af konventionelle fotokonduktorer. En af de vigtigste nyskabelser i vores design, der førte til denne springe performance forbedringer er at designe en kontakt elektrode konfiguration, der akkumulerer et stort antal foto-genererede bærere i umiddelbar nærhed af de kontaktoplysninger elektroder, således at de kan indsamles inden en sub- picosekund tidshorisont. Med andre ord, er afvejningen mellem fotokonduktorsættets ultrahurtig drift og høj kvante effektivitet mindskes ved rumlig manipulation af foto-slægterted luftfartsselskaber. Plasmoniske kontaktelektroder tilbyde denne unikke evne ved (1) tillader lys indespærring i nanoskala enhed aktive områder mellem de plasmoniske elektroder (uden diffraktion grænse), (2) ekstraordinære lys forbedring på metal kontakt og foto-absorberende halvleder-interface 10, 11. En anden vigtig egenskab ved vores løsning er, at det kan rumme store fotokonduktorenheder aktive områder uden en betydelig stigning i den parasitiske belastning til terahertz udstrålende antenne. Udnytte store fotokonduktorenheder aktive områder aktivere afbøde luftfartsselskabet screening effekten og termisk nedbrydning, som er de ultimative begrænsninger for den maksimale stråling strøm fra konventionelle fotoledende udledere. Denne video artikel er koncentreret om de unikke egenskaber i vores præsenterede løsning ved at beskrive de styrende fysik, numerisk modellering og eksperimentel verifikation. Vi eksperimentelt demonstrere 50 gange højere terahertz beføjelser fra en plasmoniske photoconductive emitter i sammenligning med en tilsvarende fotoledende emitter med non-plasmoniske kontakt elektroder.

<table border="1">
 <tbody>
 <tr>
 <td>&nbsp;</td>
 <td>&nbsp;</td>
 <td>&nbsp;</td>
 <td>Reagent</td>
 </tr>
 <tr>
 <td>Polymethyl Methacrylate (PMMA)</td>
 <td>MicroChem</td>
 <td>950K PMMA A4</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Hexamethyldisilazane (HMDS)</td>
 <td>Shin-Etsu MicroSI</td>
 <td>MicroPrime HP Primer</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Optical Photoresist</td>
 <td>Dow Chemical</td>
 <td>Megaposit SPR 220-3.0</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Photoresist Developer</td>
 <td>AZ Electronic Materials</td>
 <td>AZ 300 MIF Developer</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Methyl Iso-Butyl Keytone (MIBK)</td>
 <td>Avantor Performance Materials</td>
 <td>9322-03</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>&nbsp;</td>
 <td>&nbsp;</td>
 <td>&nbsp;</td>
 <td>Equipment</td>
 </tr>
 <tr>
 <td>Ti:Sapphire Mode-Locked Laser</td>
 <td>Coherent</td>
 <td>MIRA 900D V10 XW OPT 110V</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Pyroelectric Detector</td>
 <td>Spectrum Detector</td>
 <td>SPI-A-65 THz</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Electron-Beam Lithography Tool</td>
 <td>JEOL</td>
 <td>JBX-6300-FS</td>
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 </tr>
 <tr>
 <td>Plasma Stripper</td>
 <td>Yield Engineering Systems</td>
 <td>YES-CV200RFS</td>
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 </tr>
 <tr>
 <td>Metal Evaporator</td>
 <td>Denton Vacuum</td>
 <td>SJ-20</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Plasma Enhanced Chemical Vapor Deposition Tool</td>
 <td>GSI</td>
 <td>GSI PECVD System</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Projection Lithography Stepper</td>
 <td>GCA</td>
 <td>AutoStep 200</td>
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 <td>Reactive Ion Etcher</td>
 <td>LAM Research</td>
 <td>9400</td>
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 <tr>
 <td>Parameter Analyzer</td>
 <td>Hewlett Packard</td>
 <td>4155A</td>
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 </tr>
 <tr>
 <td>Optical Chopper</td>
 <td>Thorlabs</td>
 <td>MC2000</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Lock-in Amplifier</td>
 <td>Stanford Research Systems</td>
 <td>SR830</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Electrooptic Modulator</td>
 <td>Thorlabs</td>
 <td>EO-AM-NR-C2</td>
 <td>&nbsp;</td>
 </tr>
 <tr>
 <td>Motorized Linear Stage</td>
 <td>Thorlabs</td>
 <td>NRT100</td>
 <td>&nbsp;</td>
 </tr>
 </tbody>
</table>

design, fabrication, and experimental characterization of plasmonic photoconductive terahertz emitters

I denne video artikel vil vi fremlægge en detaljeret demonstration af en meget effektiv metode til at generere terahertz bølger. Vor teknik er baseret på photoconduction, som har været et af de mest almindeligt anvendte teknikker til terahertz generation 1-8. Terahertz generation i en fotoledende emitter opnås ved at pumpe en ultrahurtig fotokonduktorenhed med en pulserende eller heterodyned laserbelysning. Den inducerede fotostrøm, der følger kuverten af ​​pumpen laser, dirigeres til en terahertz udstrålende antenne til fotokonduktorenhederne kontaktelektroder at generere terahertz stråling. Selv om den kvante effektiviteten af ​​en fotoledende emitter teoretisk kan nå op på 100%, har de relativt lange transportvej længder af foto-genererede bærere til kontakt elektroder af konventionelle fotoledere alvorligt begrænset deres kvante effektivitet. Derudover luftfartsselskabet screening effekt, og termisk nedbrydning nøje begrænse den maksimale output power af konventionelle fotoledende terahertz kilder. At løse de kvantemekaniske effektivitet begrænsninger af konventionelle Photoconductive terahertz udledere, har vi udviklet et nyt fotoledende emitter koncept, som inkorporerer en plasmoniske kontakt elektrode konfiguration til at tilbyde høj kvante-effektivitet og ultrahurtig drift samtidig. Ved at bruge nano-skala plasmoniske kontakt elektroder, markant reducerer vi den gennemsnitlige foto-genererede carrier transport vej til fotokonduktorenheder kontaktelektroder forhold til konventionelle fotokonduktorer 9. Vores metode giver også mulighed for at øge fotokonduktor aktivt område uden en betydelig stigning i den kapacitive belastning til antennen, øge den maksimale terahertzstråling effekt ved at forhindre luftfartsselskabet screening effekt, og termisk nedbrydning ved høje optiske pumpe beføjelser. Ved at inkorporere plasmoniske kontakt elektroder udviser vi forbedre den optiske-til-terahertz power konvertering effektiviteten af ​​en konventionel fotoledende terahertz emitter med en faktor på 50 10.

For at demonstrere potentialet i plasmoniske elektroder til terahertz power ekstraudstyr, vi fabrikeret to terahertz udledere: en konventionel (figur 1a) og plasmoniske (figur 1b) fotoledende emitter indarbejde plasmoniske kontakt elektroder til at reducere carrier transporttider til at kontakte elektroder. Begge design består af en ultrahurtig fotokonduktor med 20 um mellem anode og katode kontakter forbundet til en 60 um lang butterfly antenne med maksimum og minimum bredder på 100 ...

Watch this Scientific Journal Video about Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters at JoVE.com

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Vi beskriver metoder til design, fabrikation, og eksperimenterende karakterisering af plasmoniske fotoledende udledere, som tilbyder to størrelsesordener terahertz magt niveauer i forhold til konventionelle fotoledende udledere.

Design, fremstilling, and Experimental karakterisering af plasmoniske Photoconductive Terahertz Emitters

In this video article we present a detailed demonstration of a highly efficient method for generating terahertz waves. Our technique is based on ...

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