Enhanced nonlinear absorption and optical limiting of transparent, electrospun graphite filled polymer composite nanofibers in near IR region

Investigation of the Defect and Intensity-Dependent Optical Limiting Performance of MnO2 Nanoparticle-Filled Polyvinylpyrrolidone Composite Nanofibers

“…Moreover, the diameter of the nanofibers also decreased with the filler content. Similar results were observed in the literature . Nanoparticle aggregates are more discernible and are indicated by white arrows in the micrographs.…”

Defect-assisted wavelength dependence of one photon and multiphoton absorptions in a composite nanofiber of polyvinylpyrrolidone and hexagonal boron nitride

“…Very recently, it was found that the NA of polymer/semiconductor composite nanofibers is strongly influenced by the distribution of defect states inside the energy band gap. 14,15 OPA from the valence band to defect states or the conduction band, excited state absorption (ESA), and sequential and simultaneous TPA may be observed by the defect state distribution inside the energy band gap and different laser wavelength excitation. By paying attention to these, materials possessing NA in a wide spectral range can be designed.…”

“…11 In particular, point defects lead to the creation of new trapping states within the band gap and provide magnetic and photonic functionalities. 12,13 Very recently, the effect of defect states on nonlinear absorption (NA) has been investigated for amorphous semiconductors and polycrystalline semiconductors, [14][15][16][17] as well as for polymeric nanofibers. 14,15 Those studies showed that the NA performance can be tuned by increasing the defect density.…”

“…12,13 Very recently, the effect of defect states on nonlinear absorption (NA) has been investigated for amorphous semiconductors and polycrystalline semiconductors, [14][15][16][17] as well as for polymeric nanofibers. 14,15 Those studies showed that the NA performance can be tuned by increasing the defect density. 16,[18][19][20] This strategy is a crucial point for applications such as optical limiters.…”

Slow-Photon Modes Mediated Enhanced Nonlinear Optical Absorption of a Fluorophenyl Porphyrin in a Flexible All-Polymer Bragg Reflector

“…In the MPA process two or more photons get absorbed simultaneously to the excited state with the aid of intermediate virtual states and in this case, the NLA coefficient is found to be independent of input light intensity. On the contrary, ESA represents sequential absorption of photons supported by real intermediate states and is an intensity-dependent process . Hence, to comment on the major contribution term to RSA, we have computed the βvalues for the OA curves at different optical intensities and obtained a plot of β vs input intensity (Figure d).…”