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A Wide Dynamic Range Polarization Sensing Long Wave Infrared Detector.

Elham Mohammadi¹, Nader Behdad²

¹University of Wisconsin-Madison, Department of Electrical and Computer Engineering, Madison, WI, 53706, USA.

Scientific Reports

|December 14, 2017

Summary

We developed a compact infrared polarization detector using orthogonal slot antennas and microbolometers. This device accurately senses infrared polarization with a wide dynamic range and sub-wavelength dimensions.

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Area of Science:

Optoelectronics
Infrared Sensing Technology
Nanophotonics

Background:

Infrared polarization detection is crucial for various applications, including remote sensing and imaging.
Existing detectors often lack sufficient dynamic range or operate at larger scales.
Sub-wavelength detectors offer enhanced spatial resolution and miniaturization potential.

Purpose of the Study:

To design and fabricate a novel infrared polarization sensing detector.
To achieve a wide dynamic range and sub-wavelength dimensions.
To characterize the detector's performance at a specific wavelength and varying incidence angles.

Main Methods:

The detector utilizes two orthogonal slot antennas, each with two edge-loaded microbolometers.
Infrared polarization is determined by comparing power levels absorbed by microbolometer pairs.
Detection relies on measuring changes in DC current due to microbolometer resistance variations upon IR absorption.
A DC bias voltage is applied to each antenna for sensing.

Main Results:

A prototype detector with dimensions of 0.7λ × 0.7λ (λ = free-space wavelength) was fabricated.
Maximum sensitivity was achieved at λ = 10.6 μm.
The detector demonstrated a dynamic range of 24 dB for orthogonal polarizations.
Performance was characterized for incidence angles up to ±20° from boresight.

Conclusions:

The developed detector effectively senses infrared polarization with a wide dynamic range.
Its sub-wavelength dimensions and design enable compact and high-resolution polarization sensing.
The device shows promising performance for applications requiring sensitive IR polarization detection within a specific angular range.