APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

25 Apr 2011

Volume 98, Issue 17, Articles (17xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 98, 171102 (2011); http://dx.doi.org/10.1063/1.3582035 (3 pages)

Shigeru Nakayama, Satomi Ishida, Satoshi Iwamoto, and Yasuhiko Arakawa
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Enhanced protein binding on femtosecond laser ablated poly(methyl methacrylate) surfaces

Xiaodong Ma, Haibin Huo, Ming Wei, Lingling Wang, Mengyan Shen, Carol Barry, and Joey Mead

Appl. Phys. Lett. 98, 171101 (2011); http://dx.doi.org/10.1063/1.3583981 (3 pages) | Cited 2 times

Online Publication Date: 25 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Poly(methyl methacrylate) (PMMA) substrates were ablated through a fast femtosecond (fs) laser scanning process to create patterns for enhanced protein binding. Typically, two patterns with lines and grids were produced and the protein binding was evaluated by studying the adsorption of fluorescein isothiocyanate (FITC)-labeled bovine serum albumin (BSA). It was found that the adsorption of FITC-BSA was increased up to tenfold on both patterns compared with the untreated PMMA surface, indicating the potential application of the fs laser ablated PMMA surfaces as protein assay substrates.
Show PACS
87.85.mk Proteomics
68.43.-h Chemisorption/physisorption: adsorbates on surfaces
87.15.R- Reactions and kinetics

Effect of cavity mode volume on photoluminescence from silicon photonic crystal nanocavities

Shigeru Nakayama, Satomi Ishida, Satoshi Iwamoto, and Yasuhiko Arakawa

Appl. Phys. Lett. 98, 171102 (2011); http://dx.doi.org/10.1063/1.3582035 (3 pages) | Cited 7 times

Online Publication Date: 25 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We experimentally investigated photoluminescence (PL) from silicon photonic crystal nanocavities with different mode volumes at room temperature. The integrated cavity mode intensity, which was estimated from the observed PL signal by considering extraction and collection efficiencies for each cavity mode, increased as the cavity mode volume decreased. This result suggests that smaller cavities have larger mode emission efficiency per volume than that for larger cavities at room temperature.
Show PACS
78.55.Ap Elemental semiconductors
81.05.Cy Elemental semiconductors

Low-threshold green laser heterostructures with Zn(Mg)SSe/ZnSe graded-index superlattice waveguide: Structural and optical properties

I. V. Sedova, E. V. Lutsenko, S. V. Gronin, S. V. Sorokin, A. G. Vainilovich, A. A. Sitnikova, G. P. Yablonskii, A. Alyamani, D. L. Fedorov, P. S. Kop’ev, and S. V. Ivanov

Appl. Phys. Lett. 98, 171103 (2011); http://dx.doi.org/10.1063/1.3579543 (3 pages) | Cited 2 times

Online Publication Date: 25 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report on structural and optical properties of green (λ ∼ 520 nm) ZnCdSe/ZnMgSSe optically pumped laser heterostructures with a Zn(Mg)SSe/ZnSe graded-index superlattice (SL) waveguide, grown by molecular beam epitaxy. The pseudomorphic 400 nm thick waveguide comprising a set of strained ZnMgSSe/ZnSe and ZnSSe/ZnSe SLs of different periods and barrier-to-well thickness ratios at each side of a ZnCdSe quantum well (QW) active region provides efficient transport of nonequilibrium carriers to the QW. This results in reduction in laser threshold down to the extremely low value of 1.5 kW/cm2 at 300 K and increasing the external quantum efficiency above 44%.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
42.60.By Design of specific laser systems
84.40.Az Waveguides, transmission lines, striplines

Three-dimensional surface profiling and optical characterization of liquid microlens using a Shack–Hartmann wave front sensor

Chenhui Li, Gunnsteinn Hall, Xuefeng Zeng, Difeng Zhu, Kevin Eliceiri, and Hongrui Jiang

Appl. Phys. Lett. 98, 171104 (2011); http://dx.doi.org/10.1063/1.3583379 (3 pages) | Cited 1 time

Online Publication Date: 26 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate three-dimensional (3D) surface profiling of the water–oil interface in a tunable liquid microlens using a Shack–Hartmann wave front sensor. The principles and the optical setup for achieving 3D surface measurements are presented and a hydrogel-actuated liquid lens was measured at different focal lengths. The 3D surface profiles are then used to study the optical properties of the liquid lens. Our method of 3D surface profiling could foster the improvement of liquid lens design and fabrication, including surface treatment and aberration reduction.
Show PACS
42.79.Bh Lenses, prisms and mirrors
42.79.Pw Imaging detectors and sensors
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.60.-j Optical instruments and equipment

An ultrafast quantum random number generator with provably bounded output bias based on photon arrival time measurements

Michael Wahl, Matthias Leifgen, Michael Berlin, Tino Röhlicke, Hans-Jürgen Rahn, and Oliver Benson

Appl. Phys. Lett. 98, 171105 (2011); http://dx.doi.org/10.1063/1.3578456 (3 pages) | Cited 5 times

Online Publication Date: 26 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report the implementation of a quantum random number generator based on photon arrival times. Due to fast and high resolution timing we are able to generate the highest bitrate of any current generator based on photon arrival times. Bias in the raw data due to the exponential distribution of the arrival times is removed by postprocessing which is directly integrated in the field programmable logic of the timing electronics.
Show PACS
84.30.Sk Pulse and digital circuits
85.60.Jb Light-emitting devices
85.60.Ha Photomultipliers; phototubes and photocathodes

Manipulation of multidimensional plasmonic spectra for information storage

Wei Ting Chen, Pin Chieh Wu, Chen Jung Chen, Chun-Jen Weng, Hsin-Chen Lee, Ta-Jen Yen, Chieh-Hsiung Kuan, Masud Mansuripur, and Din Ping Tsai

Appl. Phys. Lett. 98, 171106 (2011); http://dx.doi.org/10.1063/1.3584020 (3 pages) | Cited 2 times

Online Publication Date: 27 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate a concept of optical data storage through plasmonic resonances of metallic nanostructures. Metallic nanostructures exhibit strong variations in their reflectance and/or transmittance spectra due to surface plasmon polariton resonances. We study the variations in spectra through 50×50 arrays of repeated unit cells covering a total area of ∼ 50×50 μm2. Each cell contains ten different nanofeatures, such as an ellipse, a ring, a circle, a triangle, a square, etc. The size of each unit-cell is 500×500 nm2, and the periodicity is 1.0 μm. The variations in spectra are obvious enough to be distinguished and then retrieved.
Show PACS
78.66.Bz Metals and metallic alloys
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
71.36.+c Polaritons (including photon-phonon and photon-magnon interactions)
42.79.Vb Optical storage systems, optical disks

Structured scintillator for hard x-ray grating interferometry

Simon Rutishauser, Irene Zanette, Tilman Donath, Anna Sahlholm, Jan Linnros, and Christian David

Appl. Phys. Lett. 98, 171107 (2011); http://dx.doi.org/10.1063/1.3583464 (3 pages) | Cited 3 times

Online Publication Date: 27 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Grating interferometry at conventional x-ray tubes improves the quality of radiographies and tomograms by providing phase and scattering contrast data. The main challenge encountered when applying this technique at high photon energies, as required by many applications to obtain sufficient penetration depth, is to maintain a high fringe visibility. In this letter, we report on a substantial improvement in fringe visibility and according improvements in image quality achieved by replacing the absorbing analyzer grating of the interferometer with a structured scintillator grating. This development represents a significant step toward the implementation of this technique in industrial testing and medical applications.
Show PACS
07.85.-m X- and γ-ray instruments
07.60.Ly Interferometers

Detailed balance limit of the efficiency of multilevel intermediate band solar cells

Tomohiro Nozawa and Yasuhiko Arakawa

Appl. Phys. Lett. 98, 171108 (2011); http://dx.doi.org/10.1063/1.3583587 (3 pages) | Cited 13 times

Online Publication Date: 27 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Intermediate-band solar cells (IBSCs) promise ultrahigh solar-electricity energy conversion. We have calculated the detailed balance limit of the efficiency for IBSCs with multiple intermediate bands by optimizing IB’s energy levels. The results indicate that thermodynamic limit of IBSCs with 4 IBs is 74.6% which far exceeds 63% calculated in a previous study for the single IB case. By further increasing the total number IBs, the thermodynamic limit of IBSCs can ultimately approach nearly 80%.
Show PACS
88.40.H- Solar cells (photovoltaics)
88.40.J- Types of solar cells

Enhancement of nonreciprocal phase shift by magneto-optical slot waveguide with a compensation wall

Wenfu Zhang, Jian-Wei Mu, Wei-Ping Huang, and Wei Zhao

Appl. Phys. Lett. 98, 171109 (2011); http://dx.doi.org/10.1063/1.3584035 (3 pages) | Cited 3 times

Online Publication Date: 28 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrated that the nonreciprocal phase shift (NPS) can be efficiently enhanced by introducing a low-index magneto-optical (MO) slot with a compensation wall (CW) in a high-index non-MO waveguide. The proposed structure has been examined by a perturbation theory and it is found that by adjusting the slot width and waveguide height, more than 20 times enhancement of NPS comparing with the rib waveguide with a CW can be realized.
Show PACS
42.79.Gn Optical waveguides and couplers
85.70.Sq Magnetooptical devices

Statistical optoacoustic image reconstruction using a-priori knowledge on the location of acoustic distortions

X. Luís Deán-Ben, Vasilis Ntziachristos, and Daniel Razansky

Appl. Phys. Lett. 98, 171110 (2011); http://dx.doi.org/10.1063/1.3564905 (3 pages) | Cited 2 times

Online Publication Date: 28 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Strong reflection and scattering effects, arising at the boundaries of acoustically mismatched areas in living organisms, such as bones, lungs, and other air cavities, may introduce severe image artifacts into optoacoustic reconstructions. Yet, in many cases, an a priori knowledge on the location of strongly mismatched areas is available, either based on general anatomical knowledge or using other imaging modalities. In this letter, we suggest a statistical optoacoustic image reconstruction method, which uses a priori knowledge on the location of acoustic distortions in order to improve image quality and quantification. Significant improvements are showcased experimentally on tissue mimicking phantoms of different complexities.
Show PACS
87.63.D- Ultrasonography
43.35.Ud Thermoacoustics, high temperature acoustics, photoacoustic effect
87.57.cp Artifacts and distortion
87.57.nf Reconstruction
43.58.Ry Distortion: frequency, nonlinear, phase, and transient; measurement of distortion

Large optical gain AlGaN-delta-GaN quantum wells laser active regions in mid- and deep-ultraviolet spectral regimes

Jing Zhang, Hongping Zhao, and Nelson Tansu

Appl. Phys. Lett. 98, 171111 (2011); http://dx.doi.org/10.1063/1.3583442 (3 pages) | Cited 27 times

Online Publication Date: 28 April 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The gain characteristics of high Al-content AlGaN-delta-GaN quantum wells (QWs) are investigated for mid- and deep-ultraviolet (UV) lasers. The insertion of an ultrathin GaN layer in high Al-content AlGaN QWs leads to valence subbands rearrangement, which in turn results in large optical gain for mid- and deep-UV lasers.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
42.60.By Design of specific laser systems
42.72.Bj Visible and ultraviolet sources
73.20.At Surface states, band structure, electron density of states
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close