Performance analysis of quantum dots infrared photodetector

Liu, Hongmei; Zhang, Fangfang; Zhang, Jianqi; He, Guojing

doi:10.1117/12.898602

Cited by 3 publications

(3 citation statements)

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“…Different technologies (or even the same technology operating in a different wavelength regime) may produce dramatically different signal current densities operating at similar conditions. The amount of signal current generated for a given input power of IR radiation (measured for a specific wavelength) is the responsivity of the device and is defined in Equation (2):

R = \frac{e η g}{h v}

where η is the quantum efficiency (the percentage of generated carriers that are extracted from the device) of the detector and g is the photoconductive gain (the number of carriers that are generated by the device structure and applied bias for every carrier generated by an absorbed photon) [17]. As with dark current density, comparisons of responsivity are valid within specific technologies under comparable conditions, but are deceptive outside of those limitations.…”

Section: Introductionmentioning

confidence: 99%

“…Specific detectivity incorporates aspects of both the dark current density and responsivity of a device to provide a comparison of the amount of signal current generation for a given amount of noise at a specific wavelength, defined in Equation (3):

D^{*} = \frac{R_{p} \sqrt{A Δ f}}{i_{n}}

where R p is the peak responsivity, A is the cross-sectional area of the IRPD, Δf is the bandwidth of the device, and i n is the noise current [17]. High specific detectivities indicate a larger signal current generated for a given amount noise, which allows for better signal detection.…”

Section: Introductionmentioning

confidence: 99%

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Progress in Infrared Photodetectors Since 2000

Downs

Vandervelde

2013

Sensors

231

110

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The first decade of the 21st-century has seen a rapid development in infrared photodetector technology. At the end of the last millennium there were two dominant IR systems, InSb- and HgCdTe-based detectors, which were well developed and available in commercial systems. While these two systems saw improvements over the last twelve years, their change has not nearly been as marked as that of the quantum-based detectors (i.e., QWIPs, QDIPs, DWELL-IPs, and SLS-based photodetectors). In this paper, we review the progress made in all of these systems over the last decade plus, compare the relative merits of the systems as they stand now, and discuss where some of the leading research groups in these fields are going to take these technologies in the years to come.

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R = \frac{e η g}{h v}

Section: Introductionmentioning

confidence: 99%

D^{*} = \frac{R_{p} \sqrt{A Δ f}}{i_{n}}

Section: Introductionmentioning

confidence: 99%

Progress in Infrared Photodetectors Since 2000

Downs

Vandervelde

2013

Sensors

231

110

View full text Add to dashboard Cite

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“…where R p is the peak responsivity (units of A W −1 ), A is the cross-sectional area of the infrared photodetector, ∆f is the bandwidth of the device, and i n is the noise current [156]. The specific detectivity can also be thought of as the reciprocal of the noise equivalent power (NEP), which is a measure of how sensitive a device is and is equivalent to the optical input power that produces an output signal equal to the noise power.…”

Section: Detectorsmentioning

confidence: 99%

Mid-wave and long-wave infrared transmitters and detectors for optical satellite communications—a review

Flannigan

Yoell

2022

J. Opt.

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There has been a recent surge in interest for optical satellite communication utilizing lasers. It is clear to see why, as optical SatCom is capable of higher speed, lighter weight, higher directionality, and higher efficiency versus their radio-based counterparts. Research into optical SatCom has focused on devices operating in the short-wave infrared, which is due to the maturity and commercial availability of such component’s thanks to significant development in terrestrial telecommunications networks. However, short-wave infrared performs poorly in fog and heavy weather, prompting investigations into longer mid-wave and long-wave infrared bands for optical communication instead due to reduced atmospheric losses. This paper provides a comprehensive review of laser transmitters, detectors, and the science behind selecting longer wavelengths for optical SatCom to boost optical SatCom between ground stations and low earth orbit satellite constellations being deployed.

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