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

30 Jul 2012

Volume 101, Issue 5, Articles (05xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 101, 051103 (2012); http://dx.doi.org/10.1063/1.4738774 (4 pages)

Alec Rose, Da Huang, and David R. Smith
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Laser induced bubbles inside liquids: Transient optical properties and effects on a beam propagation

V. Lazic, S. Jovicevic, and M. Carpanese

Appl. Phys. Lett. 101, 054101 (2012); http://dx.doi.org/10.1063/1.4739851 (4 pages) | Cited 3 times

Online Publication Date: 30 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Light transmission through a laser formed bubble (LFB) following ablation of a metallic target inside water was studied. During the early expansion and late collapsing phases, the refraction index nb of the hot high-pressure vapor bubble is higher than 1.23 and close to that of the surrounding liquid. The cavity growth lowers nb down to 1.00 and causes strong defocusing of the incident laser beam with consequent enlargement of the ablation crater diameter, here overcoming factor two. Inhomogeneous water vapor clustering inside the cool expanded bubble further perturbs the light transmission and induces irregular ablation by the successive laser pulse.
Show PACS
52.38.Mf Laser ablation
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)

Elastic wave omnidirectional absorbers designed by transformation method

Zheng Chang and Gengkai Hu

Appl. Phys. Lett. 101, 054102 (2012); http://dx.doi.org/10.1063/1.4740077 (4 pages)

Online Publication Date: 31 July 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A conformal mapping is proposed to design with transformation method broadband elastic wave omnidirectional absorbers. This conformal mapping transforms the infinity of the virtual space into the origin of the physical space and keeps the transformed material isotropic. The material realization of such elastic wave absorber is proposed and validated by numerical simulation. Different from the existing procedure based on Hamiltonian optics, the proposed method is a more general one and can be applied to any physical process where the transformation method is valid. It also includes the existing techniques as the special cases for electromagnetic and acoustic waves.
Show PACS
43.58.-e Acoustical measurements and instrumentation

Photothermal formation and targeted positioning of bubbles by a fiber taper

Rui Xu, Hongbao Xin, Qiuguo Li, Xianguang Yang, Hao Chen, and Baojun Li

Appl. Phys. Lett. 101, 054103 (2012); http://dx.doi.org/10.1063/1.4742132 (4 pages) | Cited 1 time

Online Publication Date: 31 July 2012

Full Text: Read Online (HTML) | Download PDF

multimedia

Show Abstract
A fiber taper-based method is proposed for formation and targeted positioning of bubbles in water. By launching a laser of 1.55-μm wavelength with an optical power of over 20 mW into the fiber taper, a microbubble was formed at the taper tip. The mechanism of growth and decay of the microbubble was discussed. With the assistance of a moveable bare fiber, a train of bubbles with controllable diameters from 10 to 600 μm was formed and transported by the moveable fiber. Alternatively, by only moving the fiber taper, the formed bubbles can be easily positioned at targeted positions.
Show PACS
47.55.db Drop and bubble formation
47.80.Jk Flow visualization and imaging

Effect of liquid uptake on critical heat flux utilizing a three dimensional, interconnected alumina nano porous surfaces

Bong June Zhang and Kwang J. Kim

Appl. Phys. Lett. 101, 054104 (2012); http://dx.doi.org/10.1063/1.4739946 (4 pages) | Cited 2 times

Online Publication Date: 1 August 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In this letter, we propose a three dimensional, interconnected alumina nano porous surface (ANPS), which shows significant critical heat flux (CHF) and a reduction of wall superheat. ANPS is versatile in morphology modifications such as thickness and pore diameter and is used to enhance heat transfer. Structurally well-defined, porous wicks are efficient to absorb and spread liquid into a porous matrix. To characterize various surface wetting environments, synthetic approaches of wetting and liquid absorption have been carried out. We have studied the quantitative evaluation of liquid uptake utilizing electrochemical impedance spectroscopy (EIS). The CHF augment trend is well matched with the amount of liquid absorbed into the porous media, pre-determined by the EIS.
Show PACS
81.05.Rm Porous materials; granular materials
81.07.-b Nanoscale materials and structures: fabrication and characterization
82.80.Fk Electrochemical methods
61.43.Gt Powders, porous materials
61.46.-w Structure of nanoscale materials
68.08.Bc Wetting

In situ analysis of free radicals from the photodecomposition of hydrogen peroxide using a frequency-mixing magnetic detector

Hyobong Hong, Hans-Joachim Krause, Kibong Song, and Chel-Jong Choi

Appl. Phys. Lett. 101, 054105 (2012); http://dx.doi.org/10.1063/1.4742740 (3 pages)

Online Publication Date: 3 August 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We present an analytical method for the real-time detection of free radicals from the photodecomposition (ultraviolet radiation, λ = 254 nm) of hydrogen peroxide (H2O2) using frequency-mixing magnetic detection. We monitored the free radicals in situ without catalysts or probe molecules. Both water and H2O2 produced frequency-mixing signals under UV radiation, but the water signal was much weaker. The root mean square amplitude of the frequency-mixing signal was found to depend on the initial H2O2 concentration. Considering the physical properties of the reactants, the frequency-mixing signal is attributed to the generation of paramagnetic free radicals by the photodecomposition of H2O2.
Show PACS
82.50.Hp Processes caused by visible and UV light
33.80.Gj Diffuse spectra; predissociation, photodissociation
82.30.Cf Atom and radical reactions; chain reactions; molecule-molecule reactions
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close