With advancements in infrared detection technology, there is a need for fast, switchable infrared camouflage. Here, we report an adaptive infrared camouflage system that can be engineered to operate at any desired wavelength in the technologically relevant, infrared transparent 3−5 and 8−12 μm bands. Adaptive camouflage is actuated by exploiting the semiconductor to metal phase transition in VO 2 , which modifies the reflection spectra of the multilayered cavity-coupled plasmonic system. The temperature-dependent permittivity of VO 2 is calculated using effective medium theory to investigate its role in the optical response of the system. Finally, we show for the first time active thermal camouflage of multispectral infrared information that was encoded on a designer surface comprised of sub 20 μm pixels. Our results demonstrate the versatility of the design, which can lead to future research and applications of high definition adaptive infrared tagging, camouflaging, and anticounterfeiting efforts.
Early detection of immunoglobin G (IgG), a glycoprotein antibody produced in the serum due to various infections, is of paramount importance that will enable effective treatment, immunity assessment, and assist in monitoring outbreaks of contagious diseases. This work demonstrates the transverse magneto-optic Kerr effect (T-MOKE) based magnetoplasmons excited on a composite ferromagnetic/plasmonic grating as a highly sensitive, single wavelength, and target specific biosensing platform. The sharp T-MOKE sensitivity curve corresponding to reduced fwhm results in a two orders of magnitude enhancement in the resolving power compared to conventional propagating surface plasmon polariton (SPP), which is pivotal in identifying minute fluctuations in specific biomolecular concentrations. An order of magnitude improvement in antibody immunoglobin G (IgG) detection limit is observed compared to the SPP based sensing. A detection limit down to 10 ng/mL (66 pM) is achieved using the proposed T-MOKE technique. The results obtained provide compelling evidence of the significantly superior sensitivity and resolving power of the T-MOKE technique for the detection of Human IgG, and it is envisioned that this spectroscopy free, single wavelength measurement approach can be extended to detect biologically/chemically relevant molecules at lower concentrations for early biomedical diagnosis and therapy.
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