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5 Jul 2010

Volume 97, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 97, 013301 (2010); http://dx.doi.org/10.1063/1.3458867 (3 pages)

M. Uno, Y. Hirose, T. Uemura, K. Takimiya, Y. Nakazawa, and J. Takeya
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Electric field controlled Faraday rotation in an electro-optic/magneto-optic bilayer

Yu. S. Dadoenkova, I. L. Lyubchanskii, Y. P. Lee, and Th. Rasing

Appl. Phys. Lett. 97, 011901 (2010); http://dx.doi.org/10.1063/1.3456534 (3 pages) | Cited 2 times

Online Publication Date: 6 July 2010

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The Faraday rotation for light transmission through a bilayered structure composed of an electro-optic semiconductor film and a slab with high values of magneto-optic and magnetoelectric interactions is theoretically investigated. The influence of dispersion as well as an external electric field on the Faraday rotation is studied.
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78.66.Sq Composite materials
78.20.Ls Magneto-optical effects
78.20.Jq Electro-optical effects
77.55.Nv Multiferroic/magnetoelectric films
75.85.+t Magnetoelectric effects, multiferroics

Active waveguide effects from porous anodic alumina: An optical sensor proposition

F. Trivinho-Strixino, H. A. Guerreiro, C. S. Gomes, E. C. Pereira, and F. E. G. Guimarães

Appl. Phys. Lett. 97, 011902 (2010); http://dx.doi.org/10.1063/1.3447375 (3 pages) | Cited 1 time

Online Publication Date: 7 July 2010

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We present in this paper an active waveguide effect observed in porous anodic alumina (PA), which can be applied in optical sensors. The spectral position, shape, and polarization effect of the narrow waveguide modes is described. An analytical test with a commercial pesticide was performed.
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42.79.Gn Optical waveguides and couplers
78.60.-b Other luminescence and radiative recombination

Two-photon spectral hole burning spectroscopy of InAs/GaAs quantum dots

T. Moldaschl, W. Parz, T. Müller, S. Golka, G. Strasser, and K. Unterrainer

Appl. Phys. Lett. 97, 011903 (2010); http://dx.doi.org/10.1063/1.3460527 (3 pages)

Online Publication Date: 7 July 2010

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Femtosecond spectral hole burning experiments were performed on InAs/GaAs quantum dots to investigate the influence of high excitation intensities. The observation of additional spectral holes, as well as distinct absorption line broadening are both attributed to two-photon absorption processes. These spectral holes can be unambiguously assigned to degenerate two-photon biexciton creation, whereas the absorption line broadening is a direct result of Coulomb renormalization, initiated by carriers created through two-photon absorption in the surrounding GaAs crystal matrix and the InAs wetting layer.
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78.67.Hc Quantum dots
78.47.nd Hole burning spectroscopy
71.35.-y Excitons and related phenomena
82.53.Mj Femtosecond probing of semiconductor nanostructures

A high refractive index metamaterial at visible frequencies formed by stacked cut-wire plasmonic structures

Xingzhan Wei, Haofei Shi, Xiaochun Dong, Yueguang Lu, and Chunlei Du

Appl. Phys. Lett. 97, 011904 (2010); http://dx.doi.org/10.1063/1.3453477 (3 pages) | Cited 4 times

Online Publication Date: 8 July 2010

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A type of metamaterial composing of stacked cut-wire plasmonic structures has been designed, fabricated, and characterized. The excitation of electric resonance caused by the surface plasmons effect dominates the electric field states, so that the effective refractive index can behave as a dramatic increase at visible frequencies, which is intimately associated with the resonance strength and can be modulated by reasonably changing the structure geometries. The phenomenon has been demonstrated with the measured transmittances being in agreement with simulation results. And the effective parameters judged by Kramers–Kronig relations have been uniquely retrieved from the simulated transmission and reflection data.
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78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

Enhanced optical transmission through metal-dielectric multilayer gratings

Lin Zhou, Cheng-ping Huang, Shan Wu, Xiao-gang Yin, Yu-min Wang, Qian-jin Wang, and Yong-yuan Zhu

Appl. Phys. Lett. 97, 011905 (2010); http://dx.doi.org/10.1063/1.3458702 (3 pages) | Cited 3 times

Online Publication Date: 8 July 2010

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The optical transmission properties of metal-dielectric multilayer gratings have been investigated both experimentally and numerically. A remarkable transmission resonance, which makes a significant difference from that of traditional single/triple-layer analogs, has been reported. To understand its physical origin, a field-interference mechanism of dipole arrays induced by the lateral and vertical plasmon coupling has been suggested.
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42.25.Bs Wave propagation, transmission and absorption
42.79.Dj Gratings

High force sensitivity in Q-controlled phase-modulation atomic force microscopy

Naritaka Kobayashi, Yan Jun Li, Yoshitaka Naitoh, Masami Kageshima, and Yasuhiro Sugawara

Appl. Phys. Lett. 97, 011906 (2010); http://dx.doi.org/10.1063/1.3457431 (3 pages) | Cited 1 time

Online Publication Date: 9 July 2010

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We investigate the dependence of effective Q-factor on force sensitivity in Q-controlled phase-modulation atomic force microscopy. With Q-control, the phase noise density spectrum shows a characteristic dependence on modulation frequency (fm). The phase noise density spectrum is nearly constant in the low-fm region, whereas it decreases inverse-proportionally to fm in the high-fm region. Such a decrease enhances the force sensitivity. We demonstrate that force sensitivity can be markedly increased with Q-control to exceed the limit of force sensitivity without Q-control.
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68.37.Ps Atomic force microscopy (AFM)

Nonlinear optical conductance in a graphene pn junction in the terahertz regime

X. G. Xu, S. Sultan, C. Zhang, and J. C. Cao

Appl. Phys. Lett. 97, 011907 (2010); http://dx.doi.org/10.1063/1.3462972 (3 pages) | Cited 1 time

Online Publication Date: 9 July 2010

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We show that the optical responses of a graphene pn junction is dominated by nonlinear intraband and interband processes. At the experimentally relevant electric field intensity, nonlinear conductance is an order of magnitude larger than the linear conductance. Furthermore, the total conductance is negative in the terahertz to far infrared regime. The negative conductance provides a unique mechanism for photon generation in graphene and could be used for developing coherent terahertz radiation sources.
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78.67.Wj Optical properties of graphene
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
42.70.Nq Other nonlinear optical materials; photorefractive and semiconductor materials

Interfacial thermal conductance in spun-cast polymer films and polymer brushes

Mark D. Losego, Lionel Moh, Kevin A. Arpin, David G. Cahill, and Paul V. Braun

Appl. Phys. Lett. 97, 011908 (2010); http://dx.doi.org/10.1063/1.3458802 (3 pages) | Cited 9 times

Online Publication Date: 9 July 2010

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Interfaces between inorganic materials and anharmonic polymers have potentially intriguing thermal transport behavior. The low thermal conductivity of amorphous polymers limits significant interfacial effects to polymer film thicknesses of only a few nanometers. We use time-domain thermoreflectance to directly measure interfacial effects in the thermal conductance of spun-cast poly(methyl methacrylate) (PMMA) thin films and PMMA brushes “grafted-from” the substrate. PMMA brushes are expected to have polymer chains partially aligned perpendicular to the substrate, yet only a modest increase (13%) in thermal conductivity is observed over spun-cast layers.
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81.16.-c Methods of micro- and nanofabrication and processing
61.41.+e Polymers, elastomers, and plastics
81.20.-n Methods of materials synthesis and materials processing
78.20.N- Thermo-optic effects
66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves
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