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8 Feb 1999

Volume 74, Issue 6, pp. 777-892

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Corrugated quantum well infrared photodetectors for polarization detection

C. J. Chen, K. K. Choi, L. Rokhinson, W. H. Chang, and D. C. Tsui

Appl. Phys. Lett. 74, 862 (1999); http://dx.doi.org/10.1063/1.123391 (3 pages) | Cited 8 times

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In this letter, we propose the use of the newly developed corrugated quantum well infrared photodetectors (C-QWIPs) for polarization detection. The corrugated structure, which serves as an optical coupler as well as the polarization-sensitive component, is in this case directly created into the active region of the QWIP, therefore dispensed with the need of an external polarizer. Moreover, four C-QWIPs with differently oriented corrugated patterns can be integrated as one unit, thus allowing a precise, real-time measurement of the polarization state. The polarimetry of this detector unit was characterized using a blackbody source and a metal grating polarizer. © 1999 American Institute of Physics.  
Show PACS
85.60.Gz Photodetectors (including infrared and CCD detectors)
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
42.79.Gn Optical waveguides and couplers

Bright-blue electroluminescence from a silyl-substituted ter-(phenylene–vinylene) derivative

Zhiqiang Gao, C. S. Lee, I. Bello, S. T. Lee, Ruey-Ming Chen, Tien-Yau Luh, J. Shi, and C. W. Tang

Appl. Phys. Lett. 74, 865 (1999); http://dx.doi.org/10.1063/1.123392 (3 pages) | Cited 79 times

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A bright-blue electroluminescent device has been fabricated by using an emissive dopant and an electron-transporting host. The dopant was a highly photoluminescent silyl-substituted ter-(phenylene–vinylene) derivative [1,4-bis[4-(2-trimethylsilylvinly) styryl]-2,5-dibutoxybenzene (BTSB)]. BTSB was doped into a trimer of N-arylbenzimidazoles (TPBI) which functioned as the host and electron transporter. N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4-4′-diamine (NPB) was used as the hole transporter. The device, with a structure of indium tin oxide\NPB\TPBI:10%BTSB\TPBI\Mg:Ag, shows a bright blue emission of 11000 cd/m2 at a current density of 360 mA/cm2. The current efficiency of this device is about 3.2 cd/A at 20 mA/cm2. © 1999 American Institute of Physics.
Show PACS
78.60.Fi Electroluminescence

A fully lithographed voltage-biased superconducting spiderweb bolometer

J. M. Gildemeister, Adrian T. Lee, and P. L. Richards

Appl. Phys. Lett. 74, 868 (1999); http://dx.doi.org/10.1063/1.123393 (3 pages) | Cited 8 times

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We describe the fabrication and characterization of superconducting transition-edge bolometers for astrophysical applications at far-infrared and mm wavelengths. The sensor is voltage biased and the current is measured with a superconducting quantum interference ammeter. Strong negative electrothermal feedback keeps the sensor temperature nearly constant, reduces the response time significantly, and improves linearity. It also makes the responsivity relatively insensitive to changes in optical background loading and refrigerator temperature. The bolometers are made using standard microlithographic techniques suitable for fabrication of large scale arrays. Detailed measurements of optical response are presented for a range of bias conditions and are compared with theory. Measured noise spectra are shown and a model for the noise is presented. © 1999 American Institute of Physics.
Show PACS
95.55.Rg Photoconductors and bolometers
85.25.Pb Superconducting infrared, submillimeter and millimeter wave detectors
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors
85.25.Am Superconducting device characterization, design, and modeling
95.55.Jz Radio telescopes and instrumentation; heterodyne receivers

Dual function hybrid polymer-nanoparticle devices

K. S. Narayan, A. G. Manoj, J. Nanda, and D. D. Sarma

Appl. Phys. Lett. 74, 871 (1999); http://dx.doi.org/10.1063/1.123394 (3 pages) | Cited 24 times

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Dual properties of photoconduction and electroluminescence (EL) in hybrid devices consisting of a nanocluster semiconductor layer and a polymer are reported. It is observed that the photocurrent spectral response and efficiency in these multilayer devices are similar to that of the semiconductor component, while the EL spectral responses are closer to that of the polymer layer. The results are confirmed using the nanoparticle semiconductor, cadmium sulphide CdS, of different particle sizes and polymers representing a wide spectral range. A general feature of efficient photocurrent spectral response corresponding to nanoparticle and an appreciable EL response corresponding more to the active polymer are observed in all devices and results in wide, separated spectral windows. Current–voltage responses also indicate possibilities of added tunability in these devices. © 1999 American Institute of Physics.
Show PACS
78.66.Hf II-VI semiconductors
73.61.Ga II-VI semiconductors
78.60.Fi Electroluminescence
78.66.Qn Polymers; organic compounds
73.22.-f Electronic structure of nanoscale materials and related systems
73.50.Pz Photoconduction and photovoltaic effects
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