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IR Spectrometers

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Physics-based simulation of the modulation transfer function in HgCdTe infrared detector arrays.

Benjamin Pinkie¹, Jonathan Schuster, Enrico Bellotti

¹Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215, USA.

|August 14, 2013

Summary

We developed a numerical method to simulate infrared detector modulation transfer function (MTF). This technique analyzes charge carrier diffusion and offers mitigation strategies for improved infrared imaging performance.

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Area of Science:

Optics and Photonics
Semiconductor Physics
Infrared Technology

Background:

Infrared detector performance is crucial for various applications.
Accurate simulation of the modulation transfer function (MTF) is essential for predicting detector resolution.
Lateral charge carrier diffusion can degrade MTF in infrared focal plane arrays.

Purpose of the Study:

To develop a physics-based numerical technique for simulating the MTF of infrared detector focal plane arrays.
To analyze the impact of lateral charge carrier diffusion on MTF.
To propose methods for mitigating MTF degradation.

Main Methods:

Utilized the finite-difference time-domain (FDTD) method for electromagnetic response.
Employed the finite element method (FEM) for electrical response.
Decomposed the total MTF to isolate the effects of lateral diffusion.

Main Results:

Successfully simulated the MTF of infrared detector focal plane arrays.
Quantified the contribution of lateral charge carrier diffusion to MTF reduction.
Demonstrated the effectiveness of proposed mitigation techniques.
Applied the technique to a HgCdTe two-color bias-selectable infrared detector array.

Conclusions:

The developed numerical technique provides a robust framework for MTF simulation in infrared detectors.
Understanding and mitigating lateral diffusion is key to enhancing infrared imaging resolution.
The method is applicable to advanced infrared detector technologies like HgCdTe arrays.