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9 Aug 1999

Volume 75, Issue 6, pp. 745-878

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Polarization-insensitive wavelength selection in an axially symmetric liquid-crystal Fabry-Perot filter

Ju-Hyun Lee, Hak-Rin Kim, and Sin-Doo Lee

Appl. Phys. Lett. 75, 859 (1999); http://dx.doi.org/10.1063/1.124537 (3 pages) | Cited 16 times

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A polarization-insensitive, electrically tunable Fabry-Perot filter (FP) with a nematic liquid crystal (NLC) is demonstrated in an axially symmetrical configuration. Due to the axial symmetry, the wavelength-selection property of the FP filter is completely independent of the polarization state of the input beam in the whole range of tuning. For normal incidence, the in-plane symmetry of the input polarization state is preserved in such configuration that the alignment of the NLC molecules are homeotropic on one mirror surface and axially homogeneous on the other surface. © 1999 American Institute of Physics.
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42.79.Ci Filters, zone plates, and polarizers
42.79.Kr Display devices, liquid-crystal devices

High-efficiency piezoelectric motor combining continuous rotation with precise control over angular positioning

A. E. Glazounov, S. Wang, Q. M. Zhang, and C. Kim

Appl. Phys. Lett. 75, 862 (1999); http://dx.doi.org/10.1063/1.124538 (3 pages) | Cited 2 times

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The letter describes a piezoelectric motor that combines the merits of piezoelectric materials, such as high power density generated at electromechanical resonance, and a precise control of displacement. The motor utilizes a direct coupling mechanism between the stator and rotor, where a clutch drives the rotor via locking it. The direct coupling makes it possible to transmit the whole power generated in the piezoelectric element to the rotor, and thus achieve the high efficiency of the motor. It also allows the combining of two regimes of operation: continuous rotation and a stepwise motion within a 360° interval with a high resolution of angular displacement. © 1999 American Institute of Physics.
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84.50.+d Electric motors
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
07.05.Dz Control systems
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