Polaritons in layered materials (LMs) are a promising platform to manipulate and control light at the nanometer scale. Thus, the observation of polaritons in wafer‐scale LMs is critically important ...for the development of industrially relevant nanophotonics and optoelectronics applications. In this work, phonon polaritons (PhPs) in wafer‐scale multilayer hexagonal boron nitride (hBN) grown by chemical vapor deposition are reported. By infrared nanoimaging, the PhPs are visualized, and PhP lifetimes of ≈0.6 ps are measured, comparable to that of micromechanically exfoliated multilayer hBN. Further, PhP nanoresonators are demonstrated. Their quality factors of ≈50 are about 0.7 times that of state‐of‐the‐art devices based on exfoliated hBN. These results can enable PhP‐based surface‐enhanced infrared spectroscopy (e.g., for gas sensing) and infrared photodetector applications.
Infrared nanoimaging reveals propagating phonon polaritons on wafer‐scale nanometer‐thick hexagonal boron nitride grown by chemical vapor deposition. The material quality allows for the fabrication of phonon polariton nanoresonators with quality factors comparable to those fabricated from exfoliated hexagonal boron nitride, paving the way for wafer‐scale applications.
In this work we present an integrated biosensor that enables FTIR (Fourier Transform-Infrared) detection of analytes contained in diluted solutions. The fabricated nanosensor allows for the detection ...of proteins through the identification of the fine structure of their amide I and II bands, up to the nanomolar concentration range. We exploited two distinct effects to enhance the sensitivity: (i) the concentration effect due to the presence of the superhydrophobic surface that conveys molecules dispersed in solution directly inside the focus of a FTIR spectromicroscope; (ii) the plasmonic resonance of the nanoantenna array that provides electromagnetic field enhancement in the amide I and II spectral region (1500-1700 cm(-1)). We demonstrate the detection of ferritin in the nanomolar concentration range, a blood protein that is usually available in small amounts in typical blood samples.
The optical constants of sodium chloride in a wide pressure range were determined from the analysis of the reflectance and transmittance spectra of a minute quantity of NaCl powder placed in diamond ...anvil cells. The so-called “reststrahlen band” dominates the far-infrared reflectance spectra shifting from 150 cm–1 to 500 cm–1 at 100 GPa. For the 0–17.5 GPa pressure range, measurements allow accurate determination of both transverse and longitudinal mode frequencies. Higher pressure measurements reveal the B1 → B2 structural transition around 30 GPa and provide frequencies for the transverse and longitudinal modes. This spectroscopic signature on a sample smaller than 100 μm using light of a wavelength close to this dimension was observed, thanks to the high brilliance synchrotron source. In addition, ab initio calculations performed for the 0–200 GPa range predict the TO and LO frequencies. They are validated by the excellent agreement with the experiment.
Localized surface plasmon resonances (LSPRs), which are associated with collective oscillations of free electrons at a metal-dielectric interface, can generate large field confinement in an extremely ...small volume. This optical phenomenon is ideal for plasmonic sensing. Bearing this in mind, we combine the 3D nanoantennas design, developed recently by our group, with galvanic gold deposition to exploit LSPRs in the infrared spectral region. Here we report our theoretical and experimental results on this particular design. Moreover, our design comprises the use of a thin layer of Palladium, a well-known metal used for hydrogen sensing. The nanoantenna arrays are then applied to hydrogen detection using a mixture of 2% hydrogen in nitrogen atmosphere. The proposed device can fulfill all the requirements of conventional devices, combining easy and reproducible fabrication techniques with high sensitivity.
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•Fabrication of 3D nanoantennas with a novel design•Theoretical investigations suggest that the design can support very strong resonance in the NIR.•Galvanic gold deposition showed good uniformity and high reproducibility.•Very good response to hydrogen exposure, resulting in a resonance shift of about 250nm at 4.5μm
In this work we present an integrated biosensor that enables FTIR (Fourier Transform-Infrared) detection of analytes contained in diluted solutions. The fabricated nanosensor allows for the detection ...of proteins through the identification of the fine structure of their amide I and II bands, up to the nanomolar concentration range. We exploited two distinct effects to enhance the sensitivity: (i) the concentration effect due to the presence of the superhydrophobic surface that conveys molecules dispersed in solution directly inside the focus of a FTIR spectromicroscope; (ii) the plasmonic resonance of the nanoantenna array that provides electromagnetic field enhancement in the amide I and II spectral region (1500-1700 cm
−1
). We demonstrate the detection of ferritin in the nanomolar concentration range, a blood protein that is usually available in small amounts in typical blood samples.
In this work we present an integrated biosensor that enables FTIR (Fourier Transform-Infrared) detection of analytes contained in diluted solutions.
n-Ge on Si for mid-infrared plasmonic sensors Paul, Douglas J.; Gallacher, Kevin; Millar, Ross W. ...
2017 IEEE Photonics Society Summer Topical Meeting Series (SUM),
2017-July
Conference Proceeding
Open access
The detection and amplification of molecular absorption lines from a mustard gas simulant is demonstrated using plasmonic antennas fabricated from n-Ge epitaxially grown on Si. Approaches to ...integrated sensors will be presented along with a review of n-Ge compared to other mid-infrared plasmonic materials.
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