R. Mu

Tennessee State University

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D. O. Henderson

Care Resource

C. W. White

McMaster University

S. H. Morgan

Fisk University

Y. S. Tung

National Cheng Kung University

Akira Ueda

Kumamoto University

Richard F. Haglund

Vanderbilt University

Akiko Ueda

National Institute of Advanced Industrial Science and Technology

W. E. Collins

Fisk University

Roberto S. Aga

Intel (United States)

Yichun Liu

Northeast Normal University

Cooperative Institutions

Fisk University

Vanderbilt University

Oak Ridge National Laboratory

Chinese Academy of Sciences

Changchun Institute of Optics, Fine Mechanics and Physics

Tennessee State University

Nashville Oncology Associates

Northeast Normal University

Case Western Reserve University

University of Chinese Academy of Sciences

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Surface-Enhanced Raman Probes of Two Bio-molecules Using Ag-Coated Porous Glass-Ceramic Substrates

Frontiers in Optics (2005)

Zhejun Pan S. H. Morgan Akira Ueda R. Mu Yanshan Cui

Surface-enhanced Raman scattering (SERS) of an amino acid - phenylalanine and an antifreeze glycoprotein have been probed using Ag-coated porous glass-ceramic substrates. SERS spectra of these bio-molecules are compared to regular Raman spectra and discussed.

Biomolecule

10.1364/fio.2005.jwa33

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Citations (0)

Vibrational and Electronic Transition in InAs Quantum Dots Formed by Sequential Implantation of in and as in a-SiO₂

MRS Proceedings (1995)

Akiko Ueda D. O. Henderson R. Mu Y. S. Tung Christopher R. Hall

Surface phonon

10.1557/proc-396-441

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Citations (2)

Fabricating active plasmonic structures by combining laser-, electron- and ion-beam techniques

Richard F. Haglund Eugenii U. Donev Benjamin J. Lawrie R. Mu Jae Yong Suh

The burgeoning interest in sub-wavelength metal optics is fueled by applications ranging from cancer therapy and proteomics to opto-electronics and novel photovoltaic materials. The optical properties of nanoscale metallic structures are determined not only by the electromagnetics of localized and propagating surface plasmons, but also by the details of metal nanoparticle size, shape and spatial arrangement, and dielectric environment. This paper presents several ways in which interesting plasmonic structures and applications are made possible by nanoscale materials synthesis and structuring techniques based on pulsed laser and electron-beam deposition, electron-beam lithography and focused ion-beam nanomachining. Examples include (1) using a focused ion beam to create arrays of subwavelength holes in which the extraordinary optical transmission effect can be switched; (2) fabricating gold::VO2 composite nanoparticles to measure the size dependence of the metal-insulator transition in vanadium dioxide using surface-enhanced Raman scattering; and (3) the construction of heterostructures in which excitons can be coupled to surface plasmons.

10.2351/1.5061971

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<title>Relaxation dynamics of silicon quantum dots in silica</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1998)

D. O. Henderson Marvin H. Wu R. Mu Akira Ueda C. W. White

Silicon ions were implanted into fused silica substrates at doses of 1 by 10²¹, 2 by 10²¹, 5 by 10²¹, and 1 by 10²² ions/cm³. The implanted substrates were subsequently annealed at 1100 degrees C for one hour in a reducing atmosphere. Optical absorption spectra recorded after the annealing treatment showed absorption onsets at 316, 373, 434 and 493 nm for substrates implanted with 1 by 10²¹, 2 by 10²¹, 5 by 10²¹, and 1 by 10²² ions/cm³ respectively. Static photoluminescence (PL) measurements indicated red emission between 720 and 770 nm with a slightly increasing red shift with ion dose. Time resolved PL at room temperature revealed slow and fast lifetimes which increased with decreasing temperature. TEM studies showed that the particles size increased with increasing ion dose with typical particle sizes ranging between 2 and 5 nm indicating quantum confinement of the exciton which can account for the blue shift in the absorption edge with decreasing ion dose. However, the maxima in the PL spectra for all ion doses are relatively independent of the ion dose and are strongly Stokes shifted from the absorption spectra suggesting that radiative recombination occurs from a common luminescent center, possibly a surface or interfacial state in the SiO_x layer surrounding the nanocrystal.

Absorption edge

10.1117/12.321961

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Synthesis and Physical Properties of Semiconductor Nanocrystals Formed by Ion Implantation

ACS symposium series (1997)

Jane G. Zhu C. W. White S. P. Withrow J. D. Budai R. Mu

Nanocrystals of elemental and compound semiconductor materials have been fabricated using the ion implantation technique. The nanocrystal formation is controlled by the implantation and annealing conditions, as exemplified by the nanocrystals of Si, Ge and GaAs formed inside SiO2 matrices. Strong red photoluminescence (PL) peaked around 750 nm has been observed in samples containing Si nanocrystals in SiO2. Difference in the absorption bandgap energies and the PL peak energies is discussed. The dielectric properties of SiO2 with Ge nanocrystal inclusions have been studied using infrared reflectance spectrometry. Cavity mode predicted by the Maxwell-Garnett theory has been observed in the samples implanted with a high dose of Ge. Significant influence of implantation sequence on the formation of compound semiconductor nanocrystals are demonstrated with the GaAs in the SiO2 system. Optical absorption measurements show that Ga particles have already formed in the as-implanted stage if Ga is implanted first. A single surface phonon mode has been observed in the infrared reflectance measurement from samples containing GaAs nanocrystals.

10.1021/bk-1997-0679.ch015

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Citations (2)

Effects of exciton-plasmon coupling in zinc oxide thin films and nanowires

Bulletin of the American Physical Society (2013)

R. Mu

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Terbium-activated lithium–lanthanum–aluminosilicate oxyfluoride scintillating glass and glass-ceramic

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2008)

Zhejun Pan K. M. James Yanshan Cui A. Bürger Nerine J. Cherepy

Terbium

Radioluminescence

Lanthanum

Glass-ceramic

10.1016/j.nima.2008.06.041

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Citations (59)

Cooperative infrared to visible upconversion and visible to near-infrared quantum cutting in Tb and Yb co-doped glass containing Ag nanoparticles

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2011)

Zhejun Pan G. Sekar R. Akrobetu R. Mu S. H. Morgan

Tb, Yb, and Ag co-doped glass nano-composites were synthesized in a lithium-lanthanum-aluminosilicate glass matrix (LLAS) by a melt-quench technique. Ag nanoparticles (NPs) were formed in the glass matrix and confirmed by optical absorption and transmission electron microscopy (TEM). Plasmon enhanced luminescence was observed. Cooperative infrared to visible upconversion and visible to near-infrared quantum cutting were studied for samples with different thermal annealing times. Because the Yb³⁺ emission at 940 - 1020 nm is matched well with the band gap of crystalline Si, the quantum cutting effect may have its potential application in silicon-based solar cells.

Photon Upconversion

Ytterbium

Visible spectrum

10.1117/12.893872

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Citations (7)

Structural and Interfacial Effects on the Dielectric Properties of PVDF and its Composites for Energy Storage

Bulletin of the American Physical Society (2014)

Jennifer Jones Anthony Mayo Lei Zhu N. H. Tolk R. Mu

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