Research Project: Mikroakiskan Cip Icinde Optik Esnetme ile Taranabilen Mikrodamla Lazerlerinin Gelistirilmesi
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Contributors
Funders
ID
TB.00080
Authors
Kiraz, Alper
Faculty Member
Publications
FRET lasing from self-assembled DNA tetrahedral nanostructures suspended in optofluidic droplet resonators
(Springer, 2014) Aas, Mehdi; Kiraz, Alper; Özelci, Ersan; Jonas, A.; Liu, H.; Fan, C.; Chen, Q.; Fan, X.; Department of Physics; Graduate School of Sciences and Engineering; Yes; College of Sciences; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
We demonstrate Förster resonance energy transfer (FRET) lasing from self-assembled tetrahedral DNA complexes labeled with Cy3 and Cy5 dyes and suspended as a gain medium in aqueous microdroplet cavities deposited on a superhydrophobic surface. Threshold fluence and differential efficiency are characterized for DNA complexes containing 1Cy3-3Cy5 and 3Cy3-1Cy5. We demonstrate that at a constant Cy5 concentration, average threshold fluence is reduced 3 to 8 times and average differential efficiency is enhanced 6 to 30 times for 3Cy3-1Cy5 as compared to 1Cy3-3Cy5. Using 3Cy3-1Cy5 nanostructures, FRET lasing is observed at very low concentrations down to ∼ 1 μM. This work shows that optofluidic microlasers based on droplet resonators can be combined with DNA nanotechnology to explore applications in bio/chemical sensing and novel photonic devices.
Dye lasing in optically manipulated liquid aerosols
(Optical Society of America (OSA), 2013) Aas, Mehdi; Jonas, Alexandr; Karadağ, Yasin; Kiraz, Alper; Anand, S.; McGloin, D.; Department of Physics; Graduate School of Sciences and Engineering; Yes; College of Sciences; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
We report lasing in airborne, rhodamine B-doped glycerol-water droplets with diameters ranging between 7.7 and 11.0 mu m, which were localized using optical tweezers. While being trapped near the focal point of an infrared laser, the droplets were pumped with a Q-switched green laser. Our experiments revealed nonlinear dependence of the intensity of the droplet whispering gallery modes (WGMs) on the pump laser fluence, indicating dye lasing. The average wavelength of the lasing WGMs could be tuned between 600 and 630 nm by changing the droplet size. These results may lead to new ways of probing airborne particles, exploiting the high sensitivity of stimulated emission to small perturbations in the droplet laser cavity and the gain medium.
Lasing in optically manipulated, dye-doped emulsion microdroplets
(Elsevier, 2012) Jonas, Alexandr; Kiraz, Alper; Aas, M.; Department of Physics; Yes; College of Sciences
We introduce a portable, all-liquid microlaser based on optically pumped dye-doped emulsion microdroplets held in a single beam optical trap. We show high stability of the laser emission spectra during prolonged optical manipulation of the droplets within an immiscible host liquid. We investigate the effects of droplet size and dye concentration on the spectral position of lasing wavelength and show how these parameters can be used for the emission wavelength tuning. We also study shifting of the average lasing wavelength to the blue side of the spectrum due to dye photobleaching. The presented optically manipulated fluidic microlasers are disposable and can be easily combined with microfluidic chip technology. This makes them especially attractive for on-chip applications in chemical and biological analysis and sensing.
