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12 Nov 2012

Volume 101, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 101, 203102 (2012); http://dx.doi.org/10.1063/1.4747717 (4 pages)

Hyukjin Jung and Ki-Hun Jeong
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Controlled formation and manipulation of colloidal lattices by dynamically reconfigurable three dimensional interferometric optical traps

Jolly Xavier, Raktim Dasgupta, Sunita Ahlawat, Joby Joseph, and Pradeep Kumar Gupta

Appl. Phys. Lett. 101, 201101 (2012); http://dx.doi.org/10.1063/1.4766342 (5 pages)

Online Publication Date: 12 November 2012

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We present real-time controlled manipulation of microparticles optically trapped in three dimensional (3D)-trap array lattices generated by dynamically reconfigurable n + 1 non-coplanar multiple plane wave interference in an umbrella-like configuration. Through a programmable spatial light modulator-assisted approach, reconfigurable stable 3D interferometric optical traps belonging to diverse transverse rotational symmetry are realized and used to trap micro beads in multi-layers. Dynamically controlled translation as well as rotation of trapped array of particles are also demonstrated using presented approach. Further, the optical stacking of microparticles in an array of 3D single-stranded chiral traps portrays the versatility in tailoring axially tunable trap arrays.
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81.16.Ta Atom manipulation
82.70.Dd Colloids

Interference of surface plasmon polaritons excited at hole pairs in thin gold films

V. Häfele, F. de León-Pérez, A. Hohenau, L. Martín-Moreno, H. Plank, J. R. Krenn, and A. Leitner

Appl. Phys. Lett. 101, 201102 (2012); http://dx.doi.org/10.1063/1.4767523 (4 pages) | Cited 1 time

Online Publication Date: 12 November 2012

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The excitation of surface plasmon polaritons by focusing a laser beam onto a hole pair in a thin gold film is studied both experimentally and theoretically. By means of leakage radiation microscopy we quantitatively measure the light-plasmon coupling efficiency as a function of the hole distance. We find a modulation of the coupling efficiency as a function of hole distance that strongly depends on the polarization direction of the incident light, in agreement with theoretical simulations.
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73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
68.55.-a Thin film structure and morphology
71.36.+c Polaritons (including photon-phonon and photon-magnon interactions)

A perfect plasmonic quarter-wave plate

Yuri Gorodetski, Emmanuel Lombard, Aurélien Drezet, Cyriaque Genet, and Thomas W. Ebbesen

Appl. Phys. Lett. 101, 201103 (2012); http://dx.doi.org/10.1063/1.4766189 (4 pages) | Cited 1 time

Online Publication Date: 13 November 2012

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The excitation of surface plasmons on an elliptical grating followed by the transmission through a subwavelength aperture can modify the polarization state of the incoming light. The combined effect of the elliptical grooves and a slightly elliptical central hole allows to fully control the birefringence and retardation of the structure, providing a simple approach for polarization state design by the geometry of the structure. From this combination, a perfect plasmonic quarter-wave plate is obtained.
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42.79.Ci Filters, zone plates, and polarizers
42.79.Dj Gratings

High-efficiency spoof plasmon polariton coupler mediated by gradient metasurfaces

Jiafu Wang, Shaobo Qu, Hua Ma, Zhuo Xu, Anxue Zhang, Hang Zhou, Hongya Chen, and Yongfeng Li

Appl. Phys. Lett. 101, 201104 (2012); http://dx.doi.org/10.1063/1.4767219 (4 pages)

Online Publication Date: 13 November 2012

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Gradient metasurfaces (GMs) can provide pre-defined wave vectors that are along the surface of GMs. When the additional wave vector is greater than that of incident waves, the incident waves can be coupled efficiently as spoof plasmon polaritons (SPPs) even under normal incidence. In this Letter, the design of SPP couplers was proposed based on GMs. A high-efficiency SPP coupler was designed using split-ring resonators. Both the simulation and experiment show that the GM can achieve nearly perfect SPP-coupling under normal incidence at the designed frequency.
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42.79.Gn Optical waveguides and couplers
42.15.Eq Optical system design

Measuring the stability of polarization orientation in high intensity laser filaments in air

A. H. Sheinfux, E. Schleifer, J. Papeer, G. Fibich, B. Ilan, and A. Zigler

Appl. Phys. Lett. 101, 201105 (2012); http://dx.doi.org/10.1063/1.4767526 (3 pages)

Online Publication Date: 13 November 2012

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We suggest a method for measuring the polarization orientation of high-intensity beams, by analyzing the damage structures on metal targets, created by laser-plasma-metal interaction. We apply our method on laser filaments and demonstrate stability and instability of the polarization orientation dynamics. Our experimental results show that the polarization orientation of linearly polarized input beams during filamentation is stable, whereas that of elliptically polarized input beams is not. The results are supported by an analytical model.
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07.60.-j Optical instruments and equipment
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
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