Related Experiment Video
Updated: Aug 26, 2025
07:38
Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared
Published on: January 10, 2025
1.5K
Optically transparent infrared selective emitter for visible-infrared compatible camouflage
Optics Express
|October 12, 2022
Summary
This study introduces an optically transparent infrared selective emitter (OTISE) for advanced camouflage. The OTISE material achieves high visible light transmittance and tailored infrared emissivity, enhancing equipment survivability against surveillance systems.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Modern surveillance systems necessitate advanced camouflage solutions.
- Achieving simultaneous visible transparency and tailored infrared emissivity presents significant challenges due to material property conflicts.
Purpose of the Study:
- To develop an optically transparent infrared selective emitter (OTISE) for effective visible-infrared camouflage.
- To overcome the limitations of current multispectral camouflage materials.
Main Methods:
- Fabrication of an OTISE using Ag-ZnO-Ag disk sub-cells with anti-reflection layers.
- Enhancing and merging multi-resonator responses to improve visible transmittance and infrared absorption.
- Characterization of optical and thermal radiative properties.
Main Results:
- Achieved low emissivity in atmospheric windows (3-5 µm and 8-14 µm) and high emissivity in the 5-8 µm non-atmospheric window.
- Demonstrated high optical transparency due to ultrathin silver films.
- OTISE exhibited significantly reduced radiative flux compared to blackbody and enhanced energy dissipation over chromium film.
Conclusions:
- The proposed OTISE offers a novel strategy for designing optically transparent selective emissive materials.
- This technology holds promising applications for next-generation visible and infrared camouflage.
Related Concept Videos
01:09Infrared (IR) Spectroscopy: Overview
2.1K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
2.1K
01:19IR Spectrum
1.1K
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
1.1K
01:25IR Spectrometers
1.3K
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...
1.3K
01:21IR Absorption Frequency: Hybridization
741
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
741
01:13Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
479
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...
479
01:05Total Internal Reflection Fluorescence Microscopy
5.9K
Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
5.9K