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

5 Mar 2012

Volume 100, Issue 10, Articles (10xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 101903 (2012); http://dx.doi.org/10.1063/1.3673327 (3 pages)

Michael Ian Lapsley, Anaram Shahravan, Qingzhen Hao, Bala Krishna Juluri, Stephen Giardinelli, Mengqian Lu, Yanhui Zhao, I-Kao Chiang, Themis Matsoukas, and Tony Jun Huang
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Multicolor Čerenkov conical beams generation by cascaded-χ(2) processes in radially poled nonlinear photonic crystals

H. X. Li, S. Y. Mu, P. Xu, M. L. Zhong, C. D. Chen, X. P. Hu, W. N. Cui, and S. N. Zhu

Appl. Phys. Lett. 100, 101101 (2012); http://dx.doi.org/10.1063/1.3692593 (4 pages) | Cited 4 times

Online Publication Date: 5 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We observe multiple simultaneous cascaded-χ(2) Čerenkov conical radiations in radially poled nonlinear photonic crystals. By using two incident fundamental waves ω1 and ω2, a variety of cascaded nonlinear up-conversion processes occur which result in high-frequency Čerenkov radiations at 2ωi+ωj(i,j = 1,2) exhibiting as multicolor conical beams. Two types of phase-matching geometries with different emission angles are demonstrated for each kind of cascaded-χ(2) Čerenkov radiation. The external angle of the Čerenkov radiation exhibits strong dependence on the fundamental wavelengths. The experimental results agree well with the theoretical calculations.
Show PACS
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
42.70.Qs Photonic bandgap materials
42.65.-k Nonlinear optics

Ultrafast laser inscribed waveguide lattice in glass for direct observation of transverse localization of light

Somnath Ghosh, Nicholas D. Psaila, R. R. Thomson, Bishnu P. Pal, R. K. Varshney, and Ajoy K. Kar

Appl. Phys. Lett. 100, 101102 (2012); http://dx.doi.org/10.1063/1.3691194 (4 pages) | Cited 3 times

Online Publication Date: 5 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We present initial results of the direct observation of the signature of localized light in an ultrafast laser-inscribed (ULI) disordered lattice that contains an array of evanescently coupled, one-dimensional optical waveguides in glass in which certain amount of disorder in refractive index was introduced. Numerical simulations were carried out to test the feasibility of the initial experimental design. Such configurable ULI disordered waveguide lattices should open up a platform for investigating the phenomenon of transverse localization of light and its statistical nature.
Show PACS
42.62.-b Laser applications
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.70.Ce Glasses, quartz
42.79.Gn Optical waveguides and couplers

Assembly of microparticles by optical trapping with a photonic crystal nanocavity

C. Renaut, J. Dellinger, B. Cluzel, T. Honegger, D. Peyrade, E. Picard, F. de Fornel, and E. Hadji

Appl. Phys. Lett. 100, 101103 (2012); http://dx.doi.org/10.1063/1.3692104 (3 pages) | Cited 5 times

Online Publication Date: 5 March 2012

Full Text: Read Online (HTML) | Download PDF

multimedia

Show Abstract
In this work, we report the auto-assembly experiments of micrometer sized particles by optical trapping in the evanescent field of a photonic crystal nanocavity. The nanocavity is inserted inside an optofluidic cell designed to enable the real time control of the nanoresonator transmittance as well as the real time visualization of the particles motion in the vicinity of the nanocavity. It is demonstrated that the optical trap above the cavity enables the assembly of multiple particles in respect of different stable conformations.
Show PACS
42.50.Wk Mechanical effects of light on material media, microstructures and particles
42.82.Cr Fabrication techniques; lithography, pattern transfer
42.70.Qs Photonic bandgap materials
81.16.Dn Self-assembly

Air-guided photonic-crystal-fiber pulse-compression delivery of multimegawatt femtosecond laser output for nonlinear-optical imaging and neurosurgery

Aleksandr A. Lanin, Il’ya V. Fedotov, Dmitrii A. Sidorov-Biryukov, Lyubov V. Doronina-Amitonova, Olga I. Ivashkina, Marina A. Zots, Chi-Kuang Sun, F. Ömer Ilday, Andrei B. Fedotov, Konstantin V. Anokhin, and Aleksei M. Zheltikov

Appl. Phys. Lett. 100, 101104 (2012); http://dx.doi.org/10.1063/1.3681777 (4 pages) | Cited 2 times

Online Publication Date: 6 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Large-core hollow photonic-crystal fibers (PCFs) are shown to enable a fiber-format air-guided delivery of ultrashort infrared laser pulses for neurosurgery and nonlinear-optical imaging. With an appropriate dispersion precompensation, an anomalously dispersive 15-μm-core hollow PCF compresses 510-fs, 1070-nm light pulses to a pulse width of about 110 fs, providing a peak power in excess of 5 MW. The compressed PCF output is employed to induce a local photodisruption of corpus callosum tissues in mouse brain and is used to generate the third harmonic in brain tissues, which is captured by the PCF and delivered to a detector through the PCF cladding.
Show PACS
87.19.lh Optical imaging of neuronal activity
42.62.Be Biological and medical applications
87.63.lt Laser imaging
42.55.Tv Photonic crystal lasers and coherent effects

Control of coherent acoustic phonon generation with external bias in InGaN/GaN multiple quantum wells

C. S. Kim, J. H. Kim, H. Jeong, Y. D. Jho, H. K. Kwon, H. S. Lee, J. S. Park, K. Song, S. H. Kim, Y. J. Kim, D. Lee, and K. J. Yee

Appl. Phys. Lett. 100, 101105 (2012); http://dx.doi.org/10.1063/1.3692594 (3 pages)

Online Publication Date: 6 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Control of acoustic phonon generation with external bias is demonstrated for an InGaN light-emitting diode by performing femtosecond pump–probe measurements. The evolution of both the carrier dynamics and the acoustic phonon strength with an external bias reveals that the acoustic wave is generated during the carrier sweeping process of the depletion field, where electric field screening accompanies stress of the lattice for a piezoelectric material.
Show PACS
85.60.Jb Light-emitting devices
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
63.22.-m Phonons or vibrational states in low-dimensional structures and nanoscale materials
62.65.+k Acoustical properties of solids

Towards all-dielectric, polarization-independent optical cloaks

Jacob Andkjær, N. Asger Mortensen, and Ole Sigmund

Appl. Phys. Lett. 100, 101106 (2012); http://dx.doi.org/10.1063/1.3691835 (3 pages) | Cited 1 time

Online Publication Date: 6 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Fully enclosing, all-dielectric cloaks working for both Ez and Hz polarizations simultaneously are presented in this letter. The cloaks are effective for two antiparallel angles of incidence, and the layout of standard dielectric material in the cloak is determined by topology optimization. Scattering from cylinder and cloak is reduced for an Hz-polarized wave compared to an Ez-polarized wave by taking advantage of the surface mode at the perfectly electric conducting boundary. Perhaps contrary to simple intuition, fully enclosed, all-dielectric, low-contrast cloaks cannot be designed effectively when distributing a material with lower permittivity than the background material.
Show PACS
42.70.-a Optical materials

Surface wave resonances supported on a square array of square metallic pillars

S. J. Berry, T. Campbell, A. P. Hibbins, and J. R. Sambles

Appl. Phys. Lett. 100, 101107 (2012); http://dx.doi.org/10.1063/1.3691949 (3 pages) | Cited 1 time

Online Publication Date: 6 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A family of transverse-magnetic surface waves is shown to be supported at microwave frequencies by a square array of subwavelength square cross-section metal pillars on a conducting ground plane. These surface waves are experimentally characterised with a collimated microwave beam apparatus that utilises a pair of two-dimensional parabolic mirrors positioned on the sample surface. The dispersion of the modes, each associated with a quantisation of the electromagnetic field in the depth of the slits, is fully characterised and compared with the predictions of finite element modelling.
Show PACS
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
75.70.Rf Surface magnetism
78.70.Gq Microwave and radio-frequency interactions

Measurement of light diffusion in ZnO nanowire forests

Marijn A. M. Versteegh, Ruben E. C. van der Wel, and Jaap I. Dijkhuis

Appl. Phys. Lett. 100, 101108 (2012); http://dx.doi.org/10.1063/1.3692741 (4 pages) | Cited 2 times

Online Publication Date: 8 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Optimum design of efficient nanowire solar cells requires better understanding of light diffusion in a nanowire array. Here we demonstrate that our recently developed ultrafast all-optical shutter can be used to directly measure the dwell time of light in a nanowire array. Our measurements on disordered ZnO nanowire arrays, “nanowire forests,” indicate that the photon mean free path and the dwell time of light can be well predicted from SEM images.
Show PACS
78.66.Hf II-VI semiconductors
78.40.Fy Semiconductors
78.47.J- Ultrafast spectroscopy (<1 psec)

Tapered gold-helix metamaterials as improved circular polarizers

Justyna K. Gansel, Michael Latzel, Andreas Frölich, Johannes Kaschke, Michael Thiel, and Martin Wegener

Appl. Phys. Lett. 100, 101109 (2012); http://dx.doi.org/10.1063/1.3693181 (3 pages) | Cited 6 times

Online Publication Date: 8 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We have previously shown that square arrays of three-dimensional gold helices can serve as compact broadband circular polarizers. Here, we show by heuristic reasoning supported by numerical calculations that the bandwidth of the device can realistically be increased to 1.5 octaves by tapering the gold-helix radius. The tapering also improves the extinction ratio. Depending on the side from which light impinges onto the tapered helices, the polarization conversions are different. Therefore, the structure is either optimal as polarizer or as analyzer. Corresponding structures for the infrared spectral range are fabricated by direct laser writing and gold electroplating.
Show PACS
42.70.-a Optical materials
42.79.Ci Filters, zone plates, and polarizers
42.86.+b Optical workshop techniques
42.62.Cf Industrial applications

Polarization insensitive in-fiber mode-locker based on carbon nanotube with N-methyl-2-pryrrolidone solvent filled fiber microchamber

Chengbo Mou, Aleksey G. Rozhin, Raz Arif, Kaiming Zhou, and Sergei Turitsyn

Appl. Phys. Lett. 100, 101110 (2012); http://dx.doi.org/10.1063/1.3691922 (4 pages)

Online Publication Date: 8 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report an in-fiber laser mode locker based on carbon nanotube with n-methyl-2-pryrrolidone solvent filled in-fiber microchamber. Symmetrically femtosecond laser fabricated in-fiber microchamber with randomly oriented nanotubes assures polarization insensitive oscillation of laser mode locking. The proposed and demonstrated passively mode locked fiber laser shows higher energy soliton output. The laser has an output power of ∼29 mW (corresponding to 11 nJ energy). It shows stable soliton output with a repetition rate of ∼2.3 MHz and pulse width of ∼3.37 ps.
Show PACS
42.55.Wd Fiber lasers
42.60.By Design of specific laser systems
42.60.Fc Modulation, tuning, and mode locking
42.81.Gs Birefringence, polarization
42.81.Bm Fabrication, cladding, and splicing
42.65.Tg Optical solitons; nonlinear guided waves

Stimulated supercontinuum generation extends broadening limits in silicon

P. T. S. DeVore, D. R. Solli, C. Ropers, P. Koonath, and B. Jalali

Appl. Phys. Lett. 100, 101111 (2012); http://dx.doi.org/10.1063/1.3692103 (4 pages) | Cited 1 time

Online Publication Date: 8 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We demonstrate that stimulated supercontinuum generation alleviates restrictions on spectral broadening in silicon waveguides. At telecommunications wavelengths, two-photon and free-carrier absorption typically deplete the pump before large broadening factors can be achieved. However, broadening via modulation instability (MI) can be enhanced by seeding, which also substantially improves the energy efficiency of spectral broadening in media with nonlinear loss. Coherent seeding also generates a stable output spectrum, in contrast to conventional approaches where broadening starts from noise. The combination of self-phase modulation and stimulated modulation instability generates broadening factors in excess of 40-fold at moderate intensity levels, with >15-times better energy efficiency.
Show PACS
42.79.Gn Optical waveguides and couplers
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation

Dominant ultraviolet electroluminescence from p-ZnO:As/n-SiC(6H) heterojunction light-emitting diodes

Zhifeng Shi, Xiaochuan Xia, Wei Yin, Shikai Zhang, Hui Wang, Jin Wang, Long Zhao, Xin Dong, Baolin Zhang, and Guotong Du

Appl. Phys. Lett. 100, 101112 (2012); http://dx.doi.org/10.1063/1.3694025 (4 pages) | Cited 2 times

Online Publication Date: 9 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Ultraviolet electroluminescence was demonstrated from a p-ZnO:As/n-SiC(6H) heterojunction light-emitting diode at room-temperature. The p-ZnO:As was fabricated by out-diffusion of arsenic atoms from a sandwiched GaAs interlayer on SiC substrate. The p-type doping was confirmed by both Hall and low-temperature photoluminescence measurements. Under forward bias, an intense ultraviolet emission centered at 384 nm was achieved from ZnO side of the diode. Furthermore, the light-output-current characteristic was determined to evaluate the high-efficiency electroluminescence performance of the diode.
Show PACS
85.60.Jb Light-emitting devices
85.30.Kk Junction diodes
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close