50 × 50 μ m pixel magnetic focus field emitter array image sensor with high-gain avalanche rushing amorphous photoconductor target

Abstract

Articles you may be interested inActive-matrix Spindt-type field emitter array with faster response time for image sensor with high-gain avalanche rushing amorphous photoconductor target J. Vac. Sci. Technol. B 33, 012205 (2015); 10.1116/1.4906103 Scintillator high-gain avalanche rushing photoconductor active-matrix flat panel imager: Zero-spatial frequency xray imaging properties of the solid-state SHARP sensor structure Med. Phys. 39, 7102 (2012); 10.1118/1.4760989 Electrostatic focusing Spindt-type field emitter array for an image sensor with a high-gain avalanche rushing amorphous photoconductor target J. Vac. Sci. Technol. B 29, 04E104 (2011); 10.1116/1.3610960 640 × 480 pixel active-matrix Spindt-type field emitter array image sensor with high-gain avalanche rushing amorphous photoconductor target J. Vac. Sci. Technol. B 28, 96 (2010); 10.1116/1.3272732 256×192 pixel field emitter array image sensor with high-gain avalanche rushing amorphous photoconductor target J.A 50ϫ 50 m pixel field emitter array image sensor with a highly sensitive avalanche-mode photoconductive target and a scanning electron focusing system consisting of permanent magnets were fabricated and tested as a step toward the development of ultrahigh-sensitivity compact image sensors for high-definition television cameras. The experimental results revealed that the magnetic focusing conditions of the prototype sensor were in accordance with those estimated from the simulation, and the prototype sensor could obtain both enough resolution for its pixel size and high sensitivity by focusing the electrons emitted from the field emitter array onto the highly sensitive photoconductive target.

Amorphous selenium (a-Se) based wide wave-range photodetector driven by diamond cold cathode

“…Although much smaller versions of HARP camera tubes have been developed by using field emitter array [1][2], they still suffer from limited resolution and dynamic range. In this study, an a-Se based photodetector is fabricated using nitrogen (N) doped diamond cold cathode as signal read-out.…”

Development of a parallelized 3D electrostatic PIC-FEM code and its applications

“…Note this downward magnetic field can be achieved in practice using either coils or permanent magnets around the emission cells (8). By assuming the electric field and magnetic field do not change due to the emitted electrons, the Poisson's equation is solved only once through the use of a PAMR (parallel adaptive mesh refinement) module (9), which can automatically refine the mesh near the tip of the single CNT (top-left of Figure 3), where the electric field is very large.…”

A novel flat-panel imager for medical x-rays

“…7 With proper electron-optical focusing, this spread can be confined to the pixel size, which ranged from 20 to 90µm for the prototype sensors used in our investigation. 8,9 Future work will focus on developing engineering methods to maintain good spatial resolution and uniform avalanche gain over a large area SAPHIRE detector.…”