A systematic approach to dark current reduction in InGaAs-based photodiode arrays for shortwave infrared imaging

In this paper, the influence of etching depth on the dark current and photo-response of a mid-wave infrared Ga-free T2SL XBn pixel detector is investigated. Two wet chemical etching depths have been considered for the fabrication of a non-passivated individual pixel detector having a cut-off wavelength of 5 µm at 150 K. This study shows the strong influence of the lateral diffusion length of a shallow-etched pixel on the electro-optical properties of the device. The lowest dark current density was recorded for the deep-etched detector, on the order of 1 × 10−5 A/cm2 at 150 K and a bias operation equal to −400 mV. The corresponding quantum efficiency was measured at 60% (without anti-reflection coating) for a 3 µm thick absorbing layer. A comparison of experimental results obtained on the two kinds of etched pixels demonstrates the need for a deep-etching process combined with efficient passivation for FPA manufacturing.

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Temperature dependence of the dark current in HgCdTe photodiode arrays

10.1117/12.623219 ◽

2005 ◽

Author(s):

F. F. Sizov ◽

J. V. Gumenjuk-Sichevska ◽

I. O. Lysiuk ◽

V. V. Zabudsky ◽

A. G. Golenkov ◽

...

Keyword(s):

Temperature Dependence ◽

Dark Current ◽

Hgcdte Photodiode ◽

Photodiode Arrays

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Impact of speckle on laser range-gated shortwave infrared imaging system target identification performance

10.1117/12.477438 ◽

2002 ◽

Cited By ~ 2

Author(s):

Ronald G. Driggers ◽

Richard H. Vollmerhausen ◽

Nicole M. Devitt ◽

Carl E. Halford ◽

Kenneth J. Barnard

Keyword(s):

Infrared Imaging ◽

Imaging System ◽

Target Identification ◽

Identification Performance ◽

Laser Range ◽

Infrared Imaging System ◽

Shortwave Infrared

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Shortwave Infrared Imaging with J-Aggregates Stabilized in Hollow Mesoporous Silica Nanoparticles

10.26434/chemrxiv.7503506 ◽

2018 ◽

Author(s):

Wei Chen ◽

ChiAn Cheng ◽

Emily Cosco ◽

Shyam Ramakrishnan ◽

Jakob Lingg ◽

...

Keyword(s):

Mesoporous Silica ◽

Contrast Agents ◽

Silica Nanoparticles ◽

Near Infrared ◽

Infrared Imaging ◽

Mesoporous Silica Nanoparticles ◽

J Aggregates ◽

Hollow Mesoporous Silica ◽

Shortwave Infrared

Tissue is translucent to shortwave infrared (SWIR) light, rendering optical imaging superior in this region. However, the widespread use of optical SWIR imaging has been limited, in part, by the lack of bright, biocompatible contrast agents that absorb and emit light above 1000 nm. J-aggregation offers a means to transform stable, near-infrared (NIR) fluorophores into red-shifted SWIR contrast agents. Here we demonstrate that hollow mesoporous silica nanoparticles (HMSNs) can template the J-aggregation of NIR fluorophore IR-140 to result in nanomaterials that absorb and emit SWIR light. The J-aggregates inside PEGylated HMSNs are stable for multiple weeks in buffer and enable high resolution imaging <i>in vivo</i>with 980 nm excitation.

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