Ultrafast bandgap photonics semiconductor phenomenology: response to ultra-short pulse laser

Rafailov, Michael K.

doi:10.1117/12.858568

Cited by 5 publications

(4 citation statements)

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“…Energy of photons that induced bleaching may be well below of what is needed to exceed the level of detection [4] for the period of time that free carriers is needed in order to move through bandgap material. Therefore, energy of photons may not generate observable changes in electrical output of a photodetector.…”

Section: Electric Potential Applied To Bandgap Materials Under Bleachingmentioning

confidence: 97%

“…Ultrafast Bandgap Photonic effects can be observed, sustained and measured in an experiment: -when in experiment we are be able to separate thermal and photonic response [4] or, -when energy per pulse is carefully managed to a level when thermal effects are negligible, while ultra-short pulses are enveloped in a train where pulses intensity and repetition time do not allow thermal energy to built up in the lattice. Ultrafast Bandgap Photonics: Separating Thermal and Photonic Response.…”

Section: Transparency In Condensedmentioning

confidence: 99%

“…Surface plasmons, localized absorption on defects and dislocations, multiple scatter, superconductivity are the only partial list of effects that otherwise either obscured in the presence of volume absorption or do not exist at all without bleaching. Three major phenomena are in the foundation of Ultrafast Bandgap Photonics [4]: excitation to the level sufficient for bleaching, energy re-distribution in the conduction band and recombination. There are thermal diffusion and presence of continuum spectra specific for ultra-short pulse that may affect observation timing of Ultrafast Bandgap Photonics phenomena.…”

Section: Media Response To Ultra-short Pulsementioning

confidence: 99%

“…Bleaching fundamentally changes phenomenology of interaction and, therefore the pattern of condensed matter response. Bandgap material becomes transparent [4], volumetric absorptivity drops to zero.…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast bandgap photonics

Rafailov

2011

SPIE Proceedings

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It is well known that ultra-short pulse is able to change physical state of condensed matter: to melt, to evaporate, to ionize. It is less known that ultra-short pulse is able to change optical state -transmittance, reflectivity and polarization characteristics. In the same time a fact that ultra-short pulse may not change observable electronic state of the media passed practically unnoticed. Combination of the effects most pronounced in semiconductors were bandgap amplifies it in highly non-linear way. Changes in optical state are induced on the time scale comparable with pulse dwell time, but these changes last on the scale comparable with recombination time and depend on bandgap structure. Therefore we are introducing the term -Ultrafast Bandgap Photonics. When ultra-fast laser induces non-linear absorption, then Ultrafast Bandgap Photonic effects may be observed if combination of pulse dwell time, energy per pulse and pulse repetition rate satisfy very specific requirement. Ultrafast bandgap photonics is an optical and electronic phenomenon that changes spectral reflectivity, and transmittance as well as polarization characteristics when electronic structure of matter changes. Ultrafast Bandgap Photonics depends on pulse characteristics and bandgap structure. Ultrafast Bandgap Photonic effects are reversible and may not change physical state of media. Applications of Ultra-fast bandgap photonics are control of semiconductor characteristics and material properties. That includes, but is not limited, optically induced superconductivity, remote sensing and counter-sensing of all kind, laser cooling, bandgap material characteristics management. In this paper we discuss some foundations of ultra-fast bandgap photonics.

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Section: Electric Potential Applied To Bandgap Materials Under Bleachingmentioning

confidence: 97%

Section: Transparency In Condensedmentioning

confidence: 99%

Section: Media Response To Ultra-short Pulsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations