scholarly journals Hyperbolic Plasmons Propagate through a Nodal Metal

2022 ◽  
Author(s):  
Yinming Shao ◽  
Aaron Sternbach ◽  
Brian Kim ◽  
Andrey Rikhter ◽  
Xinyi Xu ◽  
...  
Keyword(s):  
Light Propagation ◽  
Near Infrared ◽  
Surface States ◽  
Nodal Line ◽  
Infrared Light ◽  
Energy Bands ◽  
Optical Wavelengths ◽  
Hyperbolic Waves ◽  
Optical Waveguiding

Abstract Metals are canonical plasmonic media at infrared and optical wavelengths allowing one to guide and manipulate light at sub-diffractional length scales. A special form of optical waveguiding is offered by highly anisotropic crystals revealing different signs of the dielectric function along orthogonal directions. These latter types of media are classified as hyperbolic and many crystalline insulators, semiconductors and artificial metal-based metamaterials belong to that class. Layered anisotropic metals are also anticipated to support hyperbolic waveguiding. Yet this behavior remains elusive primarily because interband processes introduce extreme losses and arrest light propagation. Here, we report on the observation of propagating hyperbolic waves in a prototypical layered nodal-line semimetal ZrSiSe. The unique electronic structure with touching energy bands at nodal points/lines suppresses losses and enables a hyperbolic regime at the telecommunications frequencies. The observed waveguiding in metallic ZrSiSe is a product of polaritonic hybridization between near-infrared light and long-lived nodal-line plasmons. By mapping the energy-momentum dispersion of the nodal-line hyperbolic modes in ZrSiSe we inquired into the role of additional screening associated with the surface states.

scholarly journals Generalized Beer–Lambert model for near-infrared light propagation in thick biological tissues

2016 ◽  
Vol 21 (7) ◽  
pp. 076012 ◽  
Author(s):  
Manish Bhatt ◽  
Kalyan R. Ayyalasomayajula ◽  
Phaneendra K. Yalavarthy
Keyword(s):  
Light Propagation ◽  
Near Infrared ◽  
Biological Tissues ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Lambert Model

scholarly journals Visible Discrimination of Broadband Infrared Light by Dye-Enhanced Upconversion in Lanthanide-Doped Nanocrystals

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Charles G. Dupuy ◽  
Thomas L. Allen ◽  
George M. Williams ◽  
David Schut
Keyword(s):  
Near Infrared ◽  
Spectral Response ◽  
Infrared Light ◽  
Optical Antennas ◽  
Optical Antenna ◽  
Recent Application ◽  
False Color ◽  
Infrared Excitation ◽  
Peak Emission

Optical upconversion of near infrared light to visible light is an attractive way to capture the optical energy or optical information contained in low-energy photons that is otherwise lost to the human eye or to certain photodetectors and solar cells. Until the recent application of broadband absorbing optical antennas, upconversion efficiency in lanthanide-doped nanocrystals was limited by the weak, narrow atomic absorption of a handful of sensitizer elements. In this work, we extend the role of the optical antenna to provide false-color, visible discrimination between bands of infrared radiation. By pairing different optical antenna dyes to specific nanoparticle compositions, unique visible emission is associated with different bands of infrared excitation. In one material set, the peak emission was increased 10-fold, and the width of the spectral response was increased more than 10-fold.

scholarly journals Lipophilicity of Bacteriochlorin-Based Photosensitizers as a Determinant for PDT Optimization through the Modulation of the Inflammatory Mediators

2019 ◽  
Vol 9 (1) ◽  
pp. 8 ◽  
Author(s):  
Barbara Pucelik ◽  
Luis G. Arnaut ◽  
Janusz M. Dąbrowski
Keyword(s):  
Immune Response ◽  
Molecular Mechanisms ◽  
Near Infrared ◽  
Antitumor Immune Response ◽  
Infrared Light ◽  
Gm Csf ◽  
Hydrophobic Compound ◽  
Tnf Α ◽  
Wide Range

Photodynamic therapy (PDT) augments the host antitumor immune response, but the role of the PDT effect on the tumor microenvironment in dependence on the type of photosensitizer and/or therapeutic protocols has not been clearly elucidated. We employed three bacteriochlorins (F2BOH, F2BMet and Cl2BHep) of different polarity that absorb near-infrared light (NIR) and generated a large amount of reactive oxygen species (ROS) to compare the PDT efficacy after various drug-to-light intervals: 15 min. (V-PDT), 3h (E-PDT) and 72h (C-PDT). We also performed the analysis of the molecular mechanisms of PDT crucial for the generation of the long-lasting antitumor immune response. PDT-induced damage affected the integrity of the host tissue and developed acute (protocol-dependent) local inflammation, which in turn led to the infiltration of neutrophils and macrophages. In order to further confirm this hypothesis, a number of proteins in the plasma of PDT-treated mice were identified. Among a wide range of cytokines (IL-6, IL-10, IL-13, IL-15, TNF-α, GM-CSF), chemokines (KC, MCP-1, MIP1α, MIP1β, MIP2) and growth factors (VEGF) released after PDT, an important role was assigned to IL-6. PDT protocols optimized for studied bacteriochlorins led to a significant increase in the survival rate of BALB/c mice bearing CT26 tumors, but each photosensitizer (PS) was more or less potent, depending on the applied DLI (15 min, 3 h or 72 h). Hydrophilic (F2BOH) and amphiphilic (F2BMet) PSs were equally effective in V-PDT (>80 cure rate). F2BMet was the most efficient in E-PDT (DLI = 3h), leading to a cure of 65 % of the animals. Finally, the most powerful PS in the C-PDT (DLI = 72 h) regimen turned out to be the most hydrophobic compound (Cl2BHep), allowing 100 % of treated animals to be cured at a light dose of only 45 J/cm2.

Large area light propagation in quasi-zero average refractive index materials

2009 ◽  
Vol 1182 ◽  
Author(s):  
Principia Dardano ◽  
Vito Mocella ◽  
Stefano Cabrini ◽  
Allan S. Chang ◽  
Luigi Moretti ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Effective Refractive Index ◽  
Light Propagation ◽  
Near Infrared ◽  
Experimental Results ◽  
Infrared Light ◽  
Large Area ◽  
Near Infrared Light ◽  
Average Refractive Index

AbstractIn this paper the experimental results show near-infrared light collimation through large area (2 x 2 mm) nanopatterned material with refractive index quasi-zero on the average. This quasi-zero refractive index is obtained alternating photonic crystals strips with effective refractive index neff = –1 and air strips (n = 1). Layers optically annihilate each other, verifying the optical antimatter concept theoretically proposed by Pendry et al [J. Phys.: Condens. Matter 15, 6345 (2003)].

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