The well-controlled guided modes and long path-lengths offered by both solid and hollow core photonic crystal fibres (PCFs) permit remarkable enhancements (and in some cases reductions) in many kinds of light-matter interaction. Recent examples include: Ultrafast spectrally bright deep and vacuum UV sources based on gas-filled hollow core PCF (pressure-tunable dispersion is a unique feature); generation of stable bright deep UV supercontinuum light in PCF drawn from the fluorozirconate glass ZBLAN; OAM-birefringent helically twisted PCF that preserves the sign of orbital angular momentum; and light-driven optoacoustic devices that permit stable high harmonic mode-locking of fiber ring lasers at GHz repetition rates.
Philip St. John Russell, "Emerging Applications of Photonic Crystal Fibers (Conference Presentation)," Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97282K (Presented at SPIE LASE: February 17, 2016; Published: 6 May 2016); https://doi.org/10.1117/12.2236679.4775980645001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon