This is a review paper about the most important laser safety procedures, it aims to implement the skills and safety awareness of lasers operation in teaching laboratories and clinical application for students and early careers who could be involved in laser operation and usage. This awareness is of great importance for individual who will be involved in dealing with lasers, as the knowledge and consistent application of laser safety procedures will guarantee a safe working environment of laser.
The objective of this project is to develop a low cost laser source for two-photon microscopy for increasing optical resolution and contrast to be used for research and deep imagining purposes.
One of the unique properties of metamaterials is the ability to manipulate electromagnetic waves at subwavelength scales, made possible by their structure on these scales. Here, rather than consider effective bulk properties, we consider the properties of microscopic features based on considering resonant unit cells. We used wire array metamaterials to form localized resonant cavities by changing the resonance frequency of one or more unit cells, surrounded by unchanged unit cells that do not support resonance for the propagating mode (i.e. forming a band gap). We validate our approach experimentally with electromagnetic waves in the terahertz range, demonstrating and characterizing subwavelength resonant cavities in this range. These resonant cavities can pave the way for ultra-compact subwavelength waveguides and other optical components.
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