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16 Aug 1999

Volume 75, Issue 7, pp. 885-1026

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Lithographically induced self-construction of polymer microstructures for resistless patterning

Stephen Y. Chou, Lei Zhuang, and Linjie Guo

Appl. Phys. Lett. 75, 1004 (1999); http://dx.doi.org/10.1063/1.124579 (3 pages) | Cited 94 times

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We have discovered and developed a method that can directly pattern polymer microstructures of arbitrary shapes without using a resist, exposure, chemical development, and etching. A mask with protruded patterns is placed a distance above an initially flat polymer film cast on a substrate. During a heating cycle that raises the temperature above the polymer’s glass transition temperature and then cooled back to the room temperature, we found that the polymer was attracted to the mask protrusions on their own, forming the mesas that have a lateral dimension identical to that of the mask protrusions, a height equal to the distance between the mask and the substrate, and a relatively steep sidewall. The method, termed lithographically induced self-construction, is important to the fabrication of polymer electronic and optoelectronic devices. © 1999 American Institute of Physics.
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85.40.Hp Lithography, masks and pattern transfer
85.65.+h Molecular electronic devices
81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials

Charge density wave ratchet

Mark I. Visscher and Gerrit E. W. Bauer

Appl. Phys. Lett. 75, 1007 (1999); http://dx.doi.org/10.1063/1.124580 (3 pages) | Cited 3 times

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We propose to operate a locally gated charge density wave as an electron pump. Applying an oscillating gate potential with frequency f causes equally spaced plateaus in the sliding charge density wave current separated by ΔI = 2eNf, where N is the number of parallel chains. The effects of thermal noise are investigated. © 1999 American Institute of Physics.
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73.23.-b Electronic transport in mesoscopic systems
71.45.Lr Charge-density-wave systems
72.15.Nj Collective modes (e.g., in one-dimensional conductors)
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
73.50.Td Noise processes and phenomena

Low-voltage 0.1 μm organic transistors and complementary inverter circuits fabricated with a low-cost form of near-field photolithography

John A. Rogers, Ananth Dodabalapur, Zhenan Bao, and Howard E. Katz

Appl. Phys. Lett. 75, 1010 (1999); http://dx.doi.org/10.1063/1.124581 (3 pages) | Cited 30 times

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This letter describes the combined use of a form of near-field photolithography that relies on a conformable phase masks with microcontact printing and shadow masking for low-cost fabrication of organic transistors and simple complementary inverter circuits with critical dimensions of ∼0.1 μm. The good performance of the devices and their low-voltage operation make them and the fabrication procedures potentially attractive for many applications. © 1999 American Institute of Physics.
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85.40.Hp Lithography, masks and pattern transfer
85.30.Tv Field effect devices

Polarity sensitive bistable color effect in cholesteric liquid crystals with an asymmetric polymer network

D. Sikharulidze, A. Tchanishvili, G. Petriashvili, N. Scaramuzza, R. Barberi, and R. Bartolino

Appl. Phys. Lett. 75, 1013 (1999); http://dx.doi.org/10.1063/1.124582 (2 pages) | Cited 2 times

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A polarity sensitive bistable color effect has been observed in cholesteric liquid crystal—polymer mixtures where a gradient of the polymer network density is created by strongly absorbed UV light. The switching between two stable states is driven by electric pulses of the same amplitude and duration but with opposite electric polarity. The effect could be of great interest for practical applications in color display technology. © 1999 American Institute of Physics.
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42.70.Df Liquid crystals
42.79.Kr Display devices, liquid-crystal devices
42.70.Jk Polymers and organics
78.40.Me Organic compounds and polymers

A piezoelectric micromotor based on acoustic precessional waveguide

Riccardo Carotenuto, Antonio Iula, Massimo Pappalardo, and Nicola Lamberti

Appl. Phys. Lett. 75, 1015 (1999); http://dx.doi.org/10.1063/1.124583 (3 pages) | Cited 1 time

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The piezomotor is composed of a stator, a steel axle, and a rotor. In the stator, which consists of a piezoelectric membrane, a flexural traveling wave is excited via piezoelectric effect. The rotating flexural displacement of the membrane excites a wide precessional wave in the axle; this wave propagates as in a waveguide, producing a precessional motion in the terminal surface of the axle. The rotor consists of a cylindrical permanent magnet, pressed in contact with the top surface of the axle by means of the magnetic force. In this way, a continuous slipping takes place between the terminal surface of the axle and the rotor. We demonstrate that the acoustic waveguide can transfer a good mechanical power (max torque 1.5×10−5 Nm, max rotational velocity 3500 rpm) with unique design flexibility in a variety of different microsystem applications. © 1999 American Institute of Physics.
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84.50.+d Electric motors
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
43.20.Mv Waveguides, wave propagation in tubes and ducts
07.10.Cm Micromechanical devices and systems
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