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8 Jan 2001

Volume 78, Issue 2, pp. 139-257

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Complex micromachines produced and driven by light

Péter Galajda and Pál Ormos

Appl. Phys. Lett. 78, 249 (2001); http://dx.doi.org/10.1063/1.1339258 (3 pages) | Cited 201 times

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A method is introduced to build microscopic light driven rotors that are created and manipulated in laser tweezers. Laser light-induced two-photon polymerization of light curing resins is applied to generate effective rotating particles several microns in size. The dynamics of rotation are evaluated. Mechanical devices consisting of multiple moving parts driven by these rotors are produced. It is shown that the combination of the techniques of microfabrication by two-photon polymerization by light and the light-induced trapping and rotation offers a powerful tool with which to build complex mechanical machines of micrometer size. © 2001 American Institute of Physics.
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07.10.Cm Micromechanical devices and systems
37.10.Vz Mechanical effects of light on atoms, molecules, and ions
82.35.Ej Nonlinear optics with polymers

Study of single-cycle pulse propagation inside a terahertz near-field probe

O. Mitrofanov, R. Harel, M. Lee, L. N. Pfeiffer, K. West, J. D. Wynn, and J. Federici

Appl. Phys. Lett. 78, 252 (2001); http://dx.doi.org/10.1063/1.1338962 (3 pages) | Cited 9 times

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Propagation of 0.5 THz single cycle pulses inside an aperture-type near-field probe is studied. The E-field amplitude attenuation is experimentally measured at various distances from the aperture. Numerical simulations based on a two-dimensional model illustrate the pulse waveform transformation and the spectral blueshift, which is experimentally observed. The study shows that the sensitivity of such a near-field probe can be improved by more than a factor of 10 by decreasing the aperture-to-detector separation without reduction of the spatial resolution. © 2001 American Institute of Physics.
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07.79.Fc Near-field scanning optical microscopes
02.60.-x Numerical approximation and analysis
42.25.Bs Wave propagation, transmission and absorption
42.65.Re Ultrafast processes; optical pulse generation and pulse compression

Digital thin-film color optical memory

C. J. Chi and A. J. Steckl

Appl. Phys. Lett. 78, 255 (2001); http://dx.doi.org/10.1063/1.1339250 (3 pages)

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A promising optical memory device called digital thin-film (DTF) color optical memory is presented. The DTF optical memory utilizes localized regions of varying thickness to adjust the spectral characteristic of reflected light from a broad band source. The DTF structure has been fabricated by Ga+ focused ion beam milling on thermally grown silicon dioxide on Si to prove the concept. A charge-coupled device array is used as the optical detector for the readout of the stored data. The reflected light image of the DTF memory reveals easily discriminated color levels and proves the suitability of using optical means to extract the stored data. DTF optical memory structures with 16 physical levels or 4 bits/pixel have been fabricated providing an equivalent storage density in excess of 5 Gb/in.2 © 2001 American Institute of Physics.
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42.79.Vb Optical storage systems, optical disks
78.66.-w Optical properties of specific thin films
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