Simultaneous measurement of mid-infrared refractive indices in thin-film heterostructures: Methodology and results for GaAs/AlGaAs

Perner, Lukas W.; Truong, Gar-Wing; Follman, David; Prinz, Maximilian; Winkler, Georg; Puchegger, S.; Cole, Garrett D.; Heckl, Oliver H.

doi:10.1103/physrevresearch.5.033048

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…Gallium Arsenide (GaAs) transmits about 50% light on an average in mid to long wave infrared light because of high refractive index [1][2] making it unsuitable to use in optoelectronic devices such as photodetectors [3,4], light emitting diodes (LEDs) [5,6] and Solar Cells [7,8,9]. Consequences of high index of refraction are Total internal reflection and Fresnel reflections at semiconductor-air interface.…”

Section: Introductionmentioning

confidence: 99%

Comparison of nano holes and nano pillars moth eye structures for mid-wave infrared

Sood,

Tu,

Hensley

et al. 2024

Image Sensing Technologies: Materials, Devices, Systems, and Applications XI

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Subwavelength moth eye structures are the nanostructures arranged uniformly whose feature size is less than the incident optical wavelength. These structures are promising to reduce the reflection of any material by creating a refractive index gradient profile at the interface surface. Mid-wave infrared (MWIR) is an important wavelength to investigate the moth eye structures for various applications like photovoltaic, solar cells and display technologies.In this paper, we fabricated two different moth eye structures Nano pillars and Nano holes using the simple and robust lithography technique. Using silicon dioxide as a hard mask, structures are transferred onto gallium arsenide substrate using different etching conditions. We compared the transmission of nanoholes and nanopillars structures and find out that nanoholes structures shows better transmittance in MWIR. We also obtained theoretical transmission data using rigorous coupled wave analysis (RCWA) which agrees with our experimental data. Moreover, Nano holes structures has an advantage over nanopillars structure as the former are resistant against contamination which therefore will not lead to decrease in transmission performance. The characterization results of the structures are obtained from SEM which shows the morphologies of the structures. Our approach is reproducible and can be easily applied to any optical devices which require antireflective property.

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Section: Introductionmentioning

confidence: 99%

Comparison of nano holes and nano pillars moth eye structures for mid-wave infrared

Sood,

Tu,

Hensley

et al. 2024

Image Sensing Technologies: Materials, Devices, Systems, and Applications XI

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Graphene-based solar absorber structure using GaAs-Al-Zr materials for renewable energy application

Alsalman,

Han,

Patel

2024

International Journal of Thermal Sciences

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Mid-infrared supermirrors with finesse exceeding 400 000

Truong,

Perner,

Bailey

et al. 2023

Nat Commun

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For trace gas sensing and precision spectroscopy, optical cavities incorporating low-loss mirrors are indispensable for path length and optical intensity enhancement. Optical interference coatings in the visible and near-infrared (NIR) spectral regions have achieved total optical losses below 2 parts per million (ppm), enabling a cavity finesse in excess of 1 million. However, such advancements have been lacking in the mid-infrared (MIR), despite substantial scientific interest. Here, we demonstrate a significant breakthrough in high-performance MIR mirrors, reporting substrate-transferred single-crystal interference coatings capable of cavity finesse values from 200 000 to 400 000 near 4.5 µm, with excess optical losses (scatter and absorption) below 5 ppm. In a first proof-of-concept demonstration, we achieve the lowest noise-equivalent absorption in a linear cavity ring-down spectrometer normalized by cavity length. This substantial improvement in performance will unlock a rich variety of MIR applications for atmospheric transport and environmental sciences, detection of fugitive emissions, process gas monitoring, breath-gas analysis, and verification of biogenic fuels and plastics.

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Simultaneous measurement of mid-infrared refractive indices in thin-film heterostructures: Methodology and results for GaAs/AlGaAs

Cited by 4 publications

References 34 publications

Comparison of nano holes and nano pillars moth eye structures for mid-wave infrared

Comparison of nano holes and nano pillars moth eye structures for mid-wave infrared

Graphene-based solar absorber structure using GaAs-Al-Zr materials for renewable energy application

Mid-infrared supermirrors with finesse exceeding 400 000

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