Reversible photodarkening of amorphous arsenic chalcogens

Pfeiffer, G.; Paesler, M. A.; Agarwal, Samarth

doi:10.1016/0022-3093(91)90449-g

Cited by 195 publications

(72 citation statements)

References 118 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Photodarkening has been studied extensively in As 2 S 3 [27][28][29][30][31][32] but relatively little in GLS; however, the thermomechanical and optical properties of GLS and As 2 S 3 are similar. Several mechanisms have been proposed for photodarkening in chalcogenides including a decrease in average intermolecular distance [31] and photoinduced changes in polarizability of van der Waals type hyperpolarizable bonds [32].…”

Section: Transmission and Micro-raman Measurementsmentioning

confidence: 99%

Spectral broadening in femtosecond laser written waveguides in chalcogenide glass

2009

View full text Add to dashboard Cite

Nonlinear spectral broadening to 200 nm, from an initial width of 50 nm, has been demonstrated in gallium lanthanum sulphide glass waveguides from 1540 nm, 200 fs pulses at 30 nJ/pulse. A formation mechanism is presented for these femtosecond laser written waveguides, based on optical characterization and comparisons to previous work. Two different types of waveguide are identified. One has a characteristic long narrow structure and is formed through filamentation caused by self-focusing. The other has a characteristic "teardrop" structure, which is formed by a type IIA photosensitivity mechanism and cumulative heating of glass around a central laser-exposed region.

show abstract

Section: Transmission and Micro-raman Measurementsmentioning

confidence: 99%

Spectral broadening in femtosecond laser written waveguides in chalcogenide glass

2009

View full text Add to dashboard Cite

show abstract

“…Thus again the most efficient − and − polarizations could be expected. The optimal CE-2 polarizations, in our opinion, mean that more complex photoinduced processes, including rearrangement of As-chalcogen helical structures [16], can dominate at 633 nm in a-As-S-Se films at appropriate (CE-2) polarization. Scalar-grating vectorial recording in chalcogenides by − polarizations can be explained by PA or polarization-selective As-As bond breaking in PSC [1,3,5,6].…”

Section: Resultsmentioning

confidence: 99%

Effect of light polarization on holographic recording in glassy azocompounds and chalcogenides

et al. 2011

View full text Add to dashboard Cite

Abstract:Light polarization effects on a holographic grating recording in a glassy chalcogenide a-As 40 S 15 Se 45 film has been experimentally studied and compared with previously studied glassy molecular azobenzene film 8a at 633, using − − , CE-1 and CE-2 circular-elliptic recording-beam polarizations (differing by light electric field rotation directions). The azocompound exhibited much higher self-diffraction efficiency (SDE) and diffraction efficiency, whereas chalcogenide was more sensitive. Their recording efficiency polarization dependences also were different. SDE up to 45% was achieved in 8a with − and up to 2.6% in a-As 40 S 15 Se 45 with CE-2 polarized recording beams. The polarization changes in the diffraction process were studied as well in these and other materials (11, 16, 19 and a-As 2 S 3 film, LiTaO 3 :Fe crystal). It was found that light polarization changes in the process of diffraction from gratings recorded vectorially by − polarizations depended on chemical composition, wavelength, and exposure time. Vector gratings with SDE up to 25% were recorded in 8a, rotating a linear polarization by 90°. No light polarization changes were found in azobenzene 19 and chalcogenide films and in LiTaO 3 :Fe crystal, thus showing a vector recording of scalar holograms. The recording mechanisms in azocompounds and chalcogenides are discussed and compared. 42.25.Ja, 42.25.Gy, 68.35.bj, 68.35.bm PACS (2008):

show abstract

“…Two explanations have been suggested to elucidate the decreasing of the band-gap energy after illumination. The first explanation states that the decrease in E opt g could be due to increasing the number of homopolar bonds [40]. However, the decrease in E g , based on the second explanation, could be due to increasing the randomness with the increase in the temperature.…”

Section: Temperature Dependence Of the Optical Transportsmentioning

confidence: 93%

Spectral optoelectronic features of Cu-containing arsenic sulfide (As2S3)0.95Cu0.05

Badr

Ramadan

Thorrya

2011

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Chalcogenide amorphous thin films of the modification (As 2 S 3 ) 0.95 Cu 0.05 were prepared using a thermal evaporation technique. The optical properties of the resultant films were investigated based on the transmittance spectra in the photon energy range 1.6-2.82 eV. Thicknesses of the films under study were determined using the envelope technique based on the transmittance spectra. The optical measurements were carried out over the conditional temperature extending from 77 to 300 K. The results of the mentioned measurements are conductive tools in investigating the electronic structures of the Chalcogenide Glasses, however the analysis of the experimental results provide information about the optical gap width and elucidate the broadness of the band tail that may disturb the band gap edges. Moreover, the single-effective oscillator was implemented in calculating both the oscillation and dispersion energies of the films under investigation. The static refractive index and the static dielectric constant were also determined for these films.

show abstract

Reversible photodarkening of amorphous arsenic chalcogens

Cited by 195 publications

References 118 publications

Spectral broadening in femtosecond laser written waveguides in chalcogenide glass

Spectral broadening in femtosecond laser written waveguides in chalcogenide glass

Effect of light polarization on holographic recording in glassy azocompounds and chalcogenides

Spectral optoelectronic features of Cu-containing arsenic sulfide (As2S3)0.95Cu0.05

Contact Info

Product

Resources

About