Effect of midgap defect states on the optical properties of Ge20Se70Te10 nano colloids
Source abstract
Abstract
Abstract In this work, we report the linear and nonlinear optical studies on a pseudo binary chalcogenide glass of composition Ge20 Se70 Te10 in its nano colloidal form. The possibility of tuning the band gap, nonlinear refractive index and nonlinear absorption of the material by changing the glass loading in the colloid has been revealed. A red shift in the band edge along with an intermediate peak in the band tail due to defect states is observed with increasing concentration. Photoluminescence studies confirm the existence of intermediate defect states in the bandgap. Nonlinear properties analyzed with open and closed aperture z scan technique reveal that the nonlinear refraction enhances due to resonant effects as the band gap of the colloid gets near the one photon absorption edge. The nonlinear absorption is prominent in the concentrated sample due to the presence of defect states which acts as an intermediate level in two step photon absorption.
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Research context
OpenAlex topics: Nonlinear Optical Materials Studies · Phase-change materials and chalcogenides · Nonlinear Optical Materials Research
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References (23)
Show source-provided references
1. Chalcogenide glasses: a review of their preparation, properties, and applications10.1016/0022-3093(94)00686-5 ↗
2. Spin-coated amorphous chalcogenide films: structural characterization10.1063/1.332294 ↗
3. Spin-coating of Ge23Sb7S70 chalcogenide glass thin films10.1016/j.jnoncrysol.2009.07.015 ↗
4. Spin-coated amorphous chalcogenide films10.1063/1.330043 ↗
5. Effect of cluster size of chalcogenide glass nano colloidal solutions on the surface morphology of spin-coated amorphous films10.1063/1.2895005 ↗
6. A review on solution processing of chalcogenide glasses for optical components10.1364/OME.3.001259 ↗
7. Inverse opal photonic crystal of chalcogenide glass by solution processing10.1016/j.jcis.2010.10.011 ↗
8. Thermo-tunable hybrid photonic crystal fiber based on solution processed chalcogenide glass nanolayer
9. Mott · 1979
10. Concentration tuned bandgap and corresponding nonlinear refractive index dispersion in Ga-Ge-Se nano colloids Indu Sebastian
11. Impact of intermediate localized states on nonlinear optical absorption of Ga-Ge-Se nano colloidal solutions Indu Sebastian10.1063/1.4789436 ↗
12. Cluster size and Excitation wavelength dependent Photoluminescence behavior of nano colloidal Ge- Se- Sb- Ga chalcogenide glass solutions
13. Nonlinear optical studies on nano colloidal Ga–Sb–Ge–Se chalcogenide glass
14. Studies On Some Ge-Se-Te glasses10.1016/0022-3093(88)90197-4 ↗
15. Sensitive measurement of optical nonlinearities using a single beam10.1109/3.53394 ↗
16. Band gap tuning and nonlinear optical characterization of TiO2-SiO2 nanocomposites with respect to composition and phase10.1016/j.optmat.2014.07.004 ↗
17. States in the gap10.1016/0022-3093(72)90194-9 ↗
18. Composition effect on the structural and optical parameters of GeSeTe thin films10.1016/j.mssp.2014.06.058 ↗
19. Tanaka · J. Mater. Sci. · 2005 · 16
20. Experimental verification of localized defect states in Ga-Ge-Se nano colloidal solutions10.1007/s10853-014-8084-8 ↗
21. Dispersion and band-gap scaling of the electronic kerr effect in solids associated with two-photon absorption10.1103/PhysRevLett.65.96 ↗
22. Dispersion of bound electronic nonlinear refraction in solid10.1109/3.89946 ↗
23. Determination of bound electronic and free carrier nonlinearities in ZnSe, GaAs, CdTe, and ZnTe10.1364/JOSAB.9.000405 ↗