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

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue

30 Jun 2003

Volume 82, Issue 26, pp. 4633-4843

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 4797 (2003); http://dx.doi.org/10.1063/1.1587262 (3 pages)

Ongi Englander, Dane Christensen, and Liwei Lin
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Probing dielectric relaxation properties of liquid CS2 with terahertz time-domain spectroscopy

B. L. Yu, F. Zeng, Q. Xing, and R. R. Alfano

Appl. Phys. Lett. 82, 4633 (2003); http://dx.doi.org/10.1063/1.1586995 (3 pages) | Cited 11 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Terahertz time-domain spectroscopy is used to investigate the dielectric relaxation properties of liquid CS2. The frequency-dependent absorption coefficient and index of refraction were measured in the frequency range 0.2–2.0 THz. The ultrafast dielectric relaxation time of liquid CS2 was determined to be 630±30 fs by fitting the dielectric function to the Debye model which is attributed to average time for rocking and rotational response of the CS2 molecules possessing an anisotropic polarizability. © 2003 American Institute of Physics.
Show PACS
77.22.Gm Dielectric loss and relaxation
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons

Dynamics of stimulated emission in silicon nanocrystals

L. Dal Negro, M. Cazzanelli, L. Pavesi, S. Ossicini, D. Pacifici, G. Franzò, F. Priolo, and F. Iacona

Appl. Phys. Lett. 82, 4636 (2003); http://dx.doi.org/10.1063/1.1586779 (3 pages) | Cited 69 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Time-resolved luminescence measurements on silicon nanocrystal waveguides obtained by thermal annealing of plasma-enhanced chemical-vapor-deposited thin layers of silicon-rich oxide have revealed fast recombination dynamics related to population inversion which leads to net optical gain. Variable stripe length measurements performed on the fast emission signal have shown an exponential growth of the amplified spontaneous emission with net gain values of about 10 cm−1. The fast emission component is strongly dependent on the pumping length for fixed excitation intensity. In addition, both the fast component intensity and its temporal decay revealed threshold behavior as a function of the incident pump intensity. © 2003 American Institute of Physics.
Show PACS
78.45.+h Stimulated emission
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
78.66.Db Elemental semiconductors and insulators
78.55.Ap Elemental semiconductors
81.07.Bc Nanocrystalline materials

Thermoelastic stress in GaAs/AlGaAs quantum cascade lasers

Vincenzo Spagnolo, Gaetano Scamarcio, Danilo Marano, Hideaki Page, and Carlo Sirtori

Appl. Phys. Lett. 82, 4639 (2003); http://dx.doi.org/10.1063/1.1586998 (3 pages) | Cited 5 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have determined the shear stress associated with the temperature gradient in quantum cascade lasers operated in continuous-wave mode. This information was obtained as a function of the electrical power using a combination of microprobe photoluminescence and anti-Stokes/Stokes Raman measurements in ridge-waveguide GaAs structures mounted epilayer down to the heat sink. At electrical power densities in the order of ∼5 kW/cm2, the strain in the cladding layers at the edges of the laser ridges reaches the critical value for the creation of misfit dislocations. Above 10–12 kW/cm2, extended defect formation and eventual device failure are observed. © 2003 American Institute of Physics.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
62.20.D- Elasticity

Dependence of two-photon-absorption-excited fluorescence on the angle between the linear polarizations of two intersecting beams

Alexandra Rapaport, Ferenc Szipöcs, and Michael Bass

Appl. Phys. Lett. 82, 4642 (2003); http://dx.doi.org/10.1063/1.1585131 (3 pages) | Cited 1 time

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report experimental observation of the dependence of the fluorescence excited by two-photon absorption (TPA/E fluorescence) in dye solutions on the angle between the linear polarizations of two intersecting pump beams. Both degenerate and nondegenerate TPA/E fluorescence were studied with 4 ns pulsed tunable lasers as pump sources. We find that earlier theoretical analyses do not contain all of the observed changes in fluorescence signal with relative polarization angle. © 2003 American Institute of Physics.
Show PACS
78.55.Bq Liquids

Low-loss, high-bandwidth graded-index plastic optical fiber fabricated by the centrifugal deposition method

Bu-Gon Shin, Joeng-Ho Park, and Jang-Joo Kim

Appl. Phys. Lett. 82, 4645 (2003); http://dx.doi.org/10.1063/1.1584516 (3 pages) | Cited 16 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Low-loss and high-bandwidth graded-index plastic optical fiber (GI-POF) was obtained by a thermal drawing of the preform fabricated by the centrifugal deposition method. In the method, a mixture of methyl methacrylate and benzyl methacrylate is fed into a rapidly rotating tube. The mixture forms a thin layer on the tube wall due to the centrifugal force and polymerizes simultaneously by thermal reaction. The feeding rate and the composition of the mixture were changed to form a desired refractive index profile. The refractive index profile of the fiber was the same as the preform. The GI-POF has the optical loss of 120 dB/km and the bandwidth of 3.45 Gbit/s 100 m at the wavelength of 650 nm. © 2003 American Institute of Physics.
Show PACS
42.81.Ht Gradient-index (GRIN) fiber devices
42.81.Bm Fabrication, cladding, and splicing
42.81.Dp Propagation, scattering, and losses; solitons

Photonic crystal laser sources for chemical detection

Marko Lončar, Axel Scherer, and Yueming Qiu

Appl. Phys. Lett. 82, 4648 (2003); http://dx.doi.org/10.1063/1.1586781 (3 pages) | Cited 103 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have realized photonic crystal lasers that permit the introduction of analyte within the peak of the optical field of the lasing mode. We have explored the design compromises for developing such sensitive low-threshold spectroscopy sources, and demonstrate the operation of photonic crystal lasers in different ambient organic solutions. We show that nanocavity lasers can be used to perform spectroscopic tests on femtoliter volumes of analyte, and propose to use these lasers for high-resolution spectroscopy with single-molecule sensitivity. © 2003 American Institute of Physics.
Show PACS
42.55.Tv Photonic crystal lasers and coherent effects
42.70.Qs Photonic bandgap materials
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
87.80.-y Biophysical techniques (research methods)

Delayed electroluminescence via triplet–triplet annihilation in light emitting diodes based on poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene]

S. Sinha and A. P. Monkman

Appl. Phys. Lett. 82, 4651 (2003); http://dx.doi.org/10.1063/1.1588733 (3 pages) | Cited 12 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A spectroscopically resolved delayed electrofluorescence is observed from poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH–PPV) thin film at low temperature. From the measurements of the delayed fluorescence intensities at a particular delay time as well as the decay kinetics of the delayed fluorescence spectra at different temperatures, we conclude that the delayed fluorescence is generated via triplet–triplet annihilation. It is suggested that the triplet state of MEH–PPV thin film has a lifetime much shorter than that of polyfluorene thin film, which is consistent with the triplet energies of these polymers. © 2003 American Institute of Physics.
Show PACS
85.60.Jb Light-emitting devices
78.60.Fi Electroluminescence

Resonance transmission modes in dual-periodical dielectric multilayer films

Q. Qin, H. Lu, S. N. Zhu, C. S. Yuan, Y. Y. Zhu, and N. B. Ming

Appl. Phys. Lett. 82, 4654 (2003); http://dx.doi.org/10.1063/1.1587880 (3 pages) | Cited 39 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The resonance transmission modes with high-quality factors may generate in a one-dimensional dual-periodic photonic band-gap structure. The frequency, frequency interval, and number of these modes can be tuned as desired by adjusting its structural parameters. In this letter, we report the experimental and theoretical results on dual-periodical TiO2/SiO2 multilayer films. With perfect transmission and mode controllability, this structure opens a promising way to fabricate multiwavelength filters for future dense wavelength division application. © 2003 American Institute of Physics.
Show PACS
42.70.Qs Photonic bandgap materials
42.79.Wc Optical coatings

High-efficiency optical transfer of torque to a nematic liquid crystal droplet

Saulius Juodkazis, Shigeki Matsuo, Naoki Murazawa, Ichiro Hasegawa, and Hiroaki Misawa

Appl. Phys. Lett. 82, 4657 (2003); http://dx.doi.org/10.1063/1.1588366 (3 pages) | Cited 23 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report on the determination of the difference in the refractive index between the ordinary and extraordinary rays in droplets of nematic liquid crystal E-44 at the wavelength of laser trapping, 1064 nm. This difference was calculated by measuring the ellipticity of laser tweezers for the moment at which rotation of the trapped droplet starts. The precision of this determination of the refractive index difference is approximately 5×10−3. Hydrophobic nematic liquid crystal E-44 formed 0.5–5-μm droplets when cast into D2O. The efficiency of the transfer of light torque to the liquid crystal droplets was determined to be 70% for the no-slip-boundary condition. © 2003 American Institute of Physics.
Show PACS
77.84.Nh Liquids, emulsions, and suspensions; liquid crystals
37.10.Vz Mechanical effects of light on atoms, molecules, and ions
61.30.-v Liquid crystals
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
78.20.Fm Birefringence

Cross-gain modulation in inhomogeneously broadened gain spectra of InP-Based 1550 nm quantum dash optical amplifiers: Small-signal bandwidth dependence on wavelength detuning

R. Alizon, A. Bilenca, H. Dery, V. Mikhelashvili, G. Eisenstein, R. Schwertberger, D. Gold, J. P. Reithmaier, and A. Forchel

Appl. Phys. Lett. 82, 4660 (2003); http://dx.doi.org/10.1063/1.1588372 (3 pages) | Cited 18 times

Online Publication Date: 24 June 2003

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Dynamical properties of cross-gain modulation (XGM) within the inhomogeneously broadened gain spectrum of an InP quantum dash optical amplifier operating at 1550 nm are examined. The small-signal XGM modulation bandwidth increases with the carrier escape time, which is achieved at long probe wavelengths. The nature of the XGM dynamics is confirmed by spectrally resolved optical modulation response measurements in quantum dash lasers. © 2003 American Institute of Physics.
Show PACS
42.55.Px Semiconductor lasers; laser diodes
42.60.Fc Modulation, tuning, and mode locking
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close