Electro-optic properties of a homeotropic liquid crystal cell with 90° surface rubbings and a reverse-handed chiral dopant
The electro-optic properties of a 90° twisted-homeotropic liquid crystal (LC) cell with a chiral dopant whose handedness is opposite to the LC twist are studied. In the voltage-off state, the LC d...
The electro-optic properties of a 90° twisted-homeotropic liquid crystal (LC) cell with a chiral dopant whose handedness is opposite to the LC twist are studied. In the voltage-off state, the LC d...
Poly(9,9-dioctylfluorene)-based light-emitting diodes with pure 
-phase emission
The authors report on poly(9,9-dioctylfluorene) (PFO)-based light-emitting diodes exhibiting an emission spectrum which was previously attributed to the so-called phase. These devices were prepared b...
-phase emissionThe authors report on poly(9,9-dioctylfluorene) (PFO)-based light-emitting diodes exhibiting an emission spectrum which was previously attributed to the so-called phase. These devices were prepared b...
High operating temperature 320×256 middle-wavelength infrared focal plane array imaging based on an InAs/InGaAs/InAlAs/InP quantum dot infrared photodetector
Appl. Phys. Lett. 90, 201109 (2007); doi:10.1063/1.2740111
Published 14 May 2007
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This letter reports a 320×256 middle-wavelength infrared focal plane array operating at temperatures up to 200 K based on an InAs quantum dot/InGaAs quantum well/InAlAs barrier detector grown on InP substrate by low pressure metal organic chemical vapor deposition. The device's low dark current density and the persistence of the photocurrent up to room temperature enabled the high temperature imaging. The focal plane array had a peak detection wavelength of 4 µm, a responsivity of 34 mA/W, a conversion efficiency of 1.1%, and a noise equivalent temperature difference of 344 mK at an operating temperature of 120 K.
©2007 American Institute of Physics
| History: | Received 16 March 2007; accepted 21 April 2007; published 14 May 2007 |
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http://link.aip.org/link/?APPLAB/90/201109/1 |
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