Optical nonlinearity of semiconductor-doped glasses at frequencies below the band gap: the role of free carriers

Banfi, G. P.; Degiorgio, Vittorio; Tan, Hui Ming

doi:10.1364/josab.12.000621

Cited by 43 publications

(10 citation statements)

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“…Up to now, most of researches about the optical nonlinearities of nanocrystal are focused on the resonant nonlinearities, whereas the study of the nonresonant optical nonlinearities is rarely involved. 10,11 At the excitation wavelength of 800 nm, hv͞E g equals 0.67 and is larger than 1͞2 E g . Around the excitation of this wavelength, the nonlinear optical responses of CdO nanoparticles are complex due to several processes involved.…”

Section: Discussion Of the Origin Of Optical Nonlinearitiesmentioning

confidence: 92%

“…These surface trapped states, although with relatively low state density, could contribute to the optical nonlinearity significantly. 11 The direct excitation of these surface trapping states will generate photocarriers which will give negative nonlinear n 2 . The nonlinear optical responses of trapped states depend on the density and the lifetime of trapping states.…”

Section: Discussion Of the Origin Of Optical Nonlinearitiesmentioning

confidence: 99%

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Optical properties of nanometer-sized CdO organosol

Wang

Zou

et al. 1998

J. Mater. Res.

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Section: Discussion Of the Origin Of Optical Nonlinearitiesmentioning

confidence: 92%

Section: Discussion Of the Origin Of Optical Nonlinearitiesmentioning

confidence: 99%

Optical properties of nanometer-sized CdO organosol

Wang

Zou

et al. 1998

J. Mater. Res.

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“…33) CdTe-doped glass has also demonstrated to be able to passively mode lock a Ti:sapphire laser. 34) Various nonlinear optical techniques, i.e., degenerate four wave mixing (DFWM), 35) non-degenerate four wave mixing, 36) spectrally resolved two beam coupling technique 37) and single beam Z-scan 38) have been employed to measure the nonlinear optical response of semiconductor doped glasses containing nanocrystals of semiconductors. Miyoshi et al investigated the femtosecond dynamics in semiconductor-doped glasses using DFWM experiments.…”

Section: Jcs-japanmentioning

confidence: 99%

Semiconductor doped glasses

Monte

2008

J. Ceram. Soc. Japan

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This paper reviews some of the interesting applications of semiconductor nanocrystals embedded in glasses. Because of their unique electronic and optical properties, semiconductor quantum dots (QDs) found wide applications in photonics. They are inexpensive and robust material and have attracted a great attention in the application of 1.3-1.5 μm optical communication.Embedding semiconductor QDs in spherical microcavities is also an attractive system both for fundamental physics research in the field of cavity quantum electrodynamics and for its potential application in lasing materials. Energy transfer processes and coupling-strength between nanocrystals can be studied and demonstrated using semiconductor nanocrystals doped glasses. It has been established that an efficient energy transfer occurs between QDs having a significant band gap energy difference, i.e., between dots of markedly different sizes. We demonstrate that a promising way to enhance energy transfer between different subsets of QDs is to red-shift the emission sufficiently far from the host absorption so that self-absorption by the host becomes negligible.

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“…The thin films of II-VI compound semiconductors group attract more attention due to their wide range of applications in the field of optoelectronics like photo-detectors [1,2], gas sensors [3], light emitting diodes (LEDs) [4,5], thin film transistors [6], optical wave guides and solar cells [7][8][9]. Among this group, cadmium selenide (CdSe) is a well-known compound semiconductor having direct band gap 1.74 eV at room temperature, high absorption coefficient in the visible range and often possess n-type conductivity [10].…”

Section: Introductionmentioning

confidence: 99%