Browsing by Keywords "Wave-guides"

Attractive versus repulsive excitonic interactions of colloidal quantum dots control blue-to red-shifting (and non-shifting) amplified spontaneous emission

Cihan, A. F.; Kelestemur, Y.; Guzelturk, B.; Yerli, O.; Kurum, U.; Yaglioglu, H. G.; Elmali, A.; Demir, H. V. (American Chemical Society, 2013-11-21)

Tunable, high-performance, two-photon absorption (TPA)-based amplified spontaneous emission (ASE) from near-unity quantum efficiency colloidal quantum dots (CQDs) is reported. Besides the absolute spectral tuning of ASE, ...

Enhancement and inhibition of photoluminescence in hydrogenated amorphous silicon nitride microcavities

Serpenguzel, A.; Aydinli, A.; Bek, A. (Optical Society of America, 1997-09-01)

A Fabry-Perot microcavity is used for the enhancement and inhibition of photoluminescence in hydrogenated amorphous silicon nitride. The amplitude of the photoluminescence is enhanced 4 times, while its linewidth is reduced ...

Ferroelectric Based Photonic Crystal Cavity by Liquid Crystal Infiltration

Karaomerlioglu, F.; Simsek S.; Mamedov, A. M.; Ozbay, E. (Taylor & Francis, 2014)

A novel type of two-dimensional photonic crystal is investigated for it optical properties as a core-shell-type ferroelectric nanorod infiltrated with nematic liquid crystals. Using the plane wave expansion method and ...

Large and dynamical tuning of a chalcogenide Fabry-Perot cavity mode by temperature modulation

Yaman, M.; Kondakci, H. E.; Bayindir, M. (Optical Society of America, 2010)

Te-enriched chalcogenide glass Ge15As25Se15Te45 (GAST) is synthesized, thermo-optically characterized and used to fabricate a one dimensional photonic crystal cavity mode that is dynamically and reversibly tuned by temperature ...

Photonic bandgap narrowing in conical hollow core Bragg fibers

Ozturk, F. E.; Yildirim, A.; Kanik, M.; Bayindir, M. (AIP Publishing, 2014)

We report the photonic bandgap engineering of Bragg fibers by controlling the thickness profile of the fiber during the thermal drawing. Conical hollow core Bragg fibers were produced by thermal drawing under a rapidly ...

Ultralow threshold one-photon-and two-photon-pumped optical gain media of blue-emitting colloidal quantum dot films

Guzelturk, B.; Kelestemur, Y.; Akgul, M. Z.; Sharma, V. K.; Demir, H. V. (American Chemical Society, 2014)

Colloidal quantum dots (QDs) offer advantageous properties as an optical gain media for lasers. Optical gain in the QDs has been shown in the whole visible spectrum, yet it has been intrinsically challenging to realize ...