01661nas a2200229 4500008004100000245005800041210005800099300001600157490000800173520102600181100001401207700001901221700001401240700001301254700001901267700002201286700001501308700001801323700002101341700002001362856004901382 2021 eng d00aPhonon Kinetics of Fructose at the Melting Transition0 aPhonon Kinetics of Fructose at the Melting Transition a12269-122760 v1253 a
Terahertz time domain spectroscopy (THz TDS) is used to measure the melting kinetics of fructose molecular crystals. Combining single-crystal anisotropy measurements with density functional calculations, we assign the phonon frequencies and interrogate how specific phonons behave with melting. While nearly all the low-frequency phonons continuously red-shift with heating and melting, the lowest-energy phonon polarized along the c-axis blue-shifts at the melting temperature, suggesting an initial structural change immediately before melting. We find that the kinetics follow a 3D growth model with large activation energies, consistent with previous differential scanning calorimetry (DSC) measurements. The large activation energies indicate that multiple H-bonds must break collectively for the transition. The results suggest the generality of the kinetics for molecular crystals and that THz TDS with picosecond resolution could be used to measure ultrafast kinetics.
1 aDavie, A.1 aVandrevala, F.1 aDampf, S.1 aDeng, Y.1 aGeorge, D., K.1 aSylvester, E., D.1 aKorter, T.1 aEinarsson, E.1 aBenedict, J., B.1 aMarkelz, A., G. uhttps://markelz.physics.buffalo.edu/node/52000619nas a2200193 4500008004100000245008500041210006900126490000900195100001600204700002200220700001800242700001500260700002400275700001500299700001800314700002400332700002000356856004900376 2019 eng d00aBlue Shift of a Molecular Crystal Phonon at the Solid to Liquid Phase Transition0 aBlue Shift of a Molecular Crystal Phonon at the Solid to Liquid 0 v20191 aDavie, Alex1 aVandrevala, Farah1 aDeng, Yanting1 aGeorge, D.1 aSylvester, Eric, D.1 aKorter, T.1 aEinarsson, E.1 aBenedict, Jason, B.1 aMarkelz, Andrea uhttps://markelz.physics.buffalo.edu/node/27604125nas a2200841 4500008004500000020001400045245005400059210005000113260000800163300000700171490000700178520199900185653001202184653001502196653002202211653001502233653001602248653002902264653001202293653002702305653001402332653001902346653001402365653000802379653002902387100002002416700002102436700002102457700001902478700002102497700001502518700001602533700001502549700001802564700002102582700002102603700002302624700001602647700002602663700001402689700001702703700002402720700001602744700001302760700002602773700001902799700001402818700002002832700001902852700002002871700002002891700001402911700001902925700001602944700001202960700001802972700001902990700001603009700001403025700002003039700001503059700001403074700001303088700001503101700001403116700001403130700001603144700001503160700001503175700002303190700002103213856004903234 2017 Engldsh a0022-372700aThe 2017 terahertz science and technology roadmap0 a2017 terahertz science and technology roadmap cFeb a490 v503 a
Science and technologies based on terahertz frequency electromagnetic radiation (100 GHz-30 THz) have developed rapidly over the last 30 years. For most of the 20th Century, terahertz radiation, then referred to as sub-millimeter wave or far-infrared radiation, was mainly utilized by astronomers and some spectroscopists. Following the development of laser based terahertz time-domain spectroscopy in the 1980s and 1990s the field of THz science and technology expanded rapidly, to the extent that it now touches many areas from fundamental science to 'real world' applications. For example THz radiation is being used to optimize materials for new solar cells, and may also be a key technology for the next generation of airport security scanners. While the field was emerging it was possible to keep track of all new developments, however now the field has grown so much that it is increasingly difficult to follow the diverse range of new discoveries and applications that are appearing. At this point in time, when the field of THz science and technology is moving from an emerging to a more established and interdisciplinary field, it is apt to present a roadmap to help identify the breadth and future directions of the field. The aim of this roadmap is to present a snapshot of the present state of THz science and technology in 2017, and provide an opinion on the challenges and opportunities that the future holds. To be able to achieve this aim, we have invited a group of international experts to write 18 sections that cover most of the key areas of THz science and technology. We hope that The 2017 Roadmap on THz science and technology will prove to be a useful resource by providing a wide ranging introduction to the capabilities of THz radiation for those outside or just entering the field as well as providing perspective and breadth for those who are well established. We also feel that this review should serve as a useful guide for government and funding agencies.
10aex-vivo10ageneration10ametal wave-guides10anear-field10aperformance10aphotoconductive emitters10aPhysics10aquantum-cascade lasers10aradiation10asemiconductors10aTerahertz10athz10atime-domain spectroscopy1 aDhillon, S., S.1 aVitiello, M., S.1 aLinfield, E., H.1 aDavies, A., G.1 aHoffmann, M., C.1 aBooske, J.1 aPaoloni, C.1 aGensch, M.1 aWeightman, P.1 aWilliams, G., P.1 aCastro-Camus, E.1 aCumming, D., R. S.1 aSimoens, F.1 aEscorcia-Carranza, I.1 aGrant, J.1 aLucyszyn, S.1 aKuwata-Gonokami, M.1 aKonishi, K.1 aKoch, M.1 aSchmuttenmaer, C., A.1 aCocker, T., L.1 aHuber, R.1 aMarkelz, A., G.1 aTaylor, Z., D.1 aWallace, V., P.1 aZeitler, J., A.1 aSibik, J.1 aKorter, T., M.1 aEllison, B.1 aRea, S.1 aGoldsmith, P.1 aCooper, K., B.1 aAppleby, R.1 aPardo, D.1 aHuggard, P., G.1 aKrozer, V.1 aShams, H.1 aFice, M.1 aRenaud, C.1 aSeeds, A.1 aStohr, A.1 aNaftaly, M.1 aRidler, N.1 aClarke, R.1 aCunningham, J., E.1 aJohnston, M., B. uhttps://markelz.physics.buffalo.edu/node/22401415nas a2200349 4500008004500000020002200045245004200067210004200109260004900151490000900200520047800209653002300687653001300710653000900723653002300732653002500755653001700780653001200797653002100809653001700830653001400847100001400861700002000875700001900895700001400914700002000928700001300948700002100961700001700982700001700999856004901016 2013 Engldsh a978-0-8194-9392-700aMeasuring phonons in protein crystals0 aMeasuring phonons in protein crystals aBellinghambSpie-Int Soc Optical Engineering0 v86233 aUsing Terahertz near field microscopy we find orientation dependent narrow band absorption features for lysozyme crystals. Here we discuss identification of protein collective modes associated with the observed features. Using normal mode calculations we find good agreement with several of the measured features, suggesting that the modes arise from internal molecular motions and not crystal phonons. Such internal modes have been associated with protein function.
10acorrelated motions10adynamics10amode10amolecular crystals10amolecular vibrations10anormal modes10aphonons10aprotein dynamics10aspectroscopy10aTerahertz1 aAcbas, G.1 aNiessen, K., A.1 aGeorge, D., K.1 aSnell, E.1 aMarkelz, A., G.1 aBetz, M.1 aElezzabi, A., Y.1 aSong, J., J.1 aTsen, K., T. uhttps://markelz.physics.buffalo.edu/node/21800733nas a2200217 4500008004100000245011300041210006900154260003400223100001800257700001800275700001900293700002100312700001900333700002300352700002000375700001700395700002000412700002000432700001400452856004900466 2012 eng d00aMulti-component response in multilayer graphene revealed through terahertz and infrared magneto-spectroscopy0 aMulticomponent response in multilayer graphene revealed through aWollongong, Australiac9/20121 aEllis, C., T.1 aStier, A., V.1 aGeorge, D., K.1 aTischler, J., G.1 aGlaser, E., R.1 aMyers-Ward, R., L.1 aTedesco, J., L.1 aEddy, C., R.1 aGaskill, D., K.1 aMarkelz, A., G.1 aCerne, J. uhttps://markelz.physics.buffalo.edu/node/30700567nas a2200181 4500008004100000020001400041245006700055210006600122300001400188490000700202100002100209700002200230700002000252700002200272700001900294700002300313856004900336 2012 eng d a1520-854000aTerahertz magneto-optical polarization modulation spectroscopy0 aTerahertz magnetooptical polarization modulation spectroscopy a1406-14120 v291 aGeorge, Deepu, K1 aStier, Andreas, V1 aEllis, Chase, T1 aMcCombe, Bruce, D1 aerne, John, Č1 aMarkelz, Andrea, G uhttps://markelz.physics.buffalo.edu/node/18600571nas a2200169 4500008004100000245006900041210006900110260005100179300001200230490000900242100002300251700002000274700001900294700001900313700002000332856004900352 2004 eng d00aTagless and universal biosensor for point detection of pathogens0 aTagless and universal biosensor for point detection of pathogens bInternational Society for Optics and Photonics a182-1860 v54111 aMarkelz, Andrea, G1 aKnab, Joseph, R1 aChen, Jing-Yin1 aerne, John, Č1 aCox, William, A uhttps://markelz.physics.buffalo.edu/node/196