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A ray dynamical approach is developed for the study of large-core asymmetric step index fibres (SIF), especially those made from chalcogenide glasses (ChGs) which can exhibit very high refractive index, large numerical aperture, and which are transparent at mid-infrared wavelengths. The model allows for deformations of the SIF away from concentric circular structures, and for the light rays captured...
The objective of our work is connected with label free investigations at nanoscale by using a new multimodal microscopy system by using near field label free techniques. The system includes the techniques with hundred nanometers resolution and with few nanometers resolution, being able to image simultaneously the same sample area giving complementary information. Our system includes also an atomic...
The paper, after a brief review on optical microresonators for biomedicine, illustrates a set-up based on a praseodymium doped microdisk. It is more deeply described and a few design details are reported. This compact amplifier is based on chalcogenide Pr3+-doped microdisk coupled to two ridge waveguides. The gain close to G = 7.9 dB is simulated for an input signal power of −30 dBm at the wavelength...
Trapping and manipulation of matter at micrometer scaled up to a single nanoparticle has assumed a fundamental role for several applications and, particularly, in biomedical environments. Furthermore, trapping of living matter at the nanoscale, such as proteins and DNA sections, allows the study of many diseases and also the investigation of the effects of new drugs on a single pathogen like a virus.
In the present work, eight-fold rotational symmetric photonic quasi-crystal structure is analyzed to explore the feasibility of supporting slow light surface modes in such configurations. The interface between the surrounding medium (air) and photonic quasi-crystal is modified to sustain surface guided optical modes for slow light applications. The directional photonic band gap and surface modes are...
A new type of layered photonic structure, whose alternating layers are filled with randomly dispersed nano-spheres, is fabricated and its optical properties are experimentally and theoretically analysed. Structures are made on a pullulan doped with chromium ions (dichromated pullulan - DCP) using holography. We found that experimental structures are similar to those observed on wings of the Diachrysia...
Phosphate glasses (PGs) are promising host materials for the development of compact fiber amplifiers and lasers thanks to their good chemical durability, easy processing, outstanding optical properties, no clustering effect and very high solubility of rare-earth (RE) ions. Furthermore, some particular calcium-phosphate glasses exhibit unique dissolution properties in aqueous media with degradation...
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