A voltage-tunable multispectral 320 × 256 InAs/GaAs quantum-dot infrared focal plane array

Abstract

A voltage-tunable multispectral 320 × 256 infrared imaging focal plane array (FPA) is reported. It is based on InAs/GaAs quantum dots infrared phototdetctors (QDIP) with GaAs and In 0.20 Ga 0.80 As capping layers, corresponding to the extended middle-wave infrared (5-8 μm) and long-wave infrared (8-12 μm) detection bands, respectively. The FPA shows a noise-equivalent temperature difference of 172 mK at an operating temperature of 67 K. Voltage-tunable multispectral imaging was also achieved. Since each of the detection spectra of the QD FPA can be individually tuned by engineering its QD capping layer, this approach offers great flexibility in designing of a multispectral FPA.

Colloidal and Epitaxial Quantum Dot Infrared Photodetectors: Growth, Performance, and Comparison

“…Quantum dotbased FPA performances have been improving. Normalized NETD is plotted as a function of wavelength in Figure 23 for both QDIPs (52,(290)(291)(292)(293)(294)(295)(296) and QWIPs (296)(297)(298)(299)(300)(301)(302)(303)(304).…”

Review of current progress in quantum dot infrared photodetectors

“…Normalized NETD is plotted as a function of wavelength in Fig. 7 for both QDIPs [67,68,105,[133][134][135][136][137] and QWIPs [91,92,102,126,128,[138][139][140]. For fair comparison, all NETD data points are scaled to have an f-number (f ) of 2, using the following relation [116]:…”

Voltage-tunable dual-band quantum dot infrared photodetectors for temperature sensing

“…Besides, with three dimensional confinement structure and suppressed electron-phonon interactions, QDIPs are predicted to be able to absorb normal incident light and provide high temperature operation [5]. With these motivations, QDIPs have been widely studied in the past decade and the voltage-tunable dual-band operations using different designs have been demonstrated by many groups [6][7][8][9][10][11][12][13]. Some results are also implemented into FPAs [11][12][13].…”

“…With these motivations, QDIPs have been widely studied in the past decade and the voltage-tunable dual-band operations using different designs have been demonstrated by many groups [6][7][8][9][10][11][12][13]. Some results are also implemented into FPAs [11][12][13]. However, the previous reports did not present a very desirable spectral feature that comprises narrow peaks located separately at mid-wave IR (MWIR, 3-5 µm) and long-wave IR (LWIR, 8-12 µm) atmospheric windows and also shows low spectral cross-talk on the two-color operation.…”