Abstract
Silver iodide metaphosphate glasses of the xAgI + (1−x)AgPO3 family are embedded inside the air capillaries of a commercial silica photonic crystal fiber (PCF) by means of vacuum-assisted infiltration technique. In this paper, we report on tuning the photonic bandgap (PBG) guidance characteristics of the fabricated all-glass photonic bandgap fibers, by varying the composition of the fast-ion-conducting phosphate glass infiltration medium. Doping AgPO3 metaphosphate glass with AgI significantly alters the PBG guidance patterns in the examined range between 350 and 1750 nm, as it leads to the introduction of numerous additional transmission stop-bands, while affecting scattering dependant losses. The effect of phosphate glass cooling method during sample fabrication on the transmission behavior of the xAgI + (1−x)AgPO3/PCFs is also considered.
Highlights
Photonic bandgap (PBG) optical fiber guidance relies on the existence of a refractive index contrast opto-geometrical configuration, where a low refractive index photonic crystal fiber (PCF) core is surrounded by high refractive index strands ordered in a periodic lattice, while rendering the low refractive index fiber core a phase defect of this periodic lattice wherein propagation at discrete frequencies is allowed [1,2,3]
We note that scanning electron microscopy (SEM) scans of the binary metaphosphate glass AgPO3/LMA-10 fibers have been extensively presented in previous studies [6,7], and not included for the sake of space
The transmission characteristics of composite xAgI + (1−x)AgPO3/silica photonic bandgap (PBG) fibers were tuned by varying AgI concentration, as well as, following different cooling methods during sample fabrication
Summary
Photonic bandgap (PBG) optical fiber guidance relies on the existence of a refractive index contrast opto-geometrical configuration, where a low refractive index photonic crystal fiber (PCF) core is surrounded by high refractive index strands ordered in a periodic lattice, while rendering the low refractive index fiber core a phase defect of this periodic lattice wherein propagation at discrete frequencies is allowed [1,2,3]. The effect of AgPO3 glass laser photosensitivity on the guiding properties of the composite PCF was investigated [6], whereas, the latter study focuses on shaping the PBG guiding properties of AgPO3 glass infiltrated PCFs upon introduction of silver nanoparticles inside the phosphate glass strands via thermal poling processes [7] Along these lines, the potential exploitation of silver nanoparticles plasmon resonance characteristics attracts substantial interest in terms of the development of in-fiber electrically driven devices and sensors [9,10,11]. The choice of infiltrating PCFs with FIC phosphate glasses is prompted by variety of reasons and opens up new prospective for developing new devices and for studying interesting light propagation effects Apart from their soft nature (extremely low glass transition temperature, Tg) and low melt viscosities that allow the formation of highly homogeneous glass strands inside the PCFs, silver phosphate FIC glasses provide two additional advantages of great importance. Samples, while all samples are examined by scanning electron microscopy (SEM) in order to verify glass filling quality
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