706 research outputs found
Formation of in-volume nanogratings with sub-100 nm periods in glass by femtosecond laser irradiation
We present direct experimental observation of the morphological evolution
during the formation of nanogratings with sub-100-nm periods with the
increasing number of pulses. Theoretical simulation shows that the constructive
interference of the scattering light from original nanoplanes will create an
intensity maximum located between the two adjacent nanoplanes, resulting in
shortening of the nanograting period by half. The proposed mechanism enables
explaining the formation of nanogratings with periods beyond that predicted by
the nanoplasmonic model.Comment: 4 pages, 3 figure
Modeling the Processes of Fluvial Scouring and Sediment Transport of Dajia River, Taiwan
Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive
On-chip electro-optic tuning of a lithium niobate microresonator with integrated in-plane microelectrodes
We demonstrate electro-optic tuning of an on-chip lithium niobate
microresonator with integrated in-plane microelectrodes. First two metallic
microelectrodes on the substrate were formed via femtosecond laser process.
Then a high-Q lithium niobate microresonator located between the
microelectrodes was fabricated by femtosecond laser direct writing accompanied
by focused ion beam milling. Due to the efficient structure designing, high
electro-optical tuning coefficient of 3.41 pm/V was observed.Comment: 6 pages, 3 figure
Thoracic aorta pseudoaneurysm with hemopericardium: unusual presentation of warfarin overdose
There have been few case reports which discuss a relationship between warfarin overdose and aortic pseudoaneurysm leakage. We report the case of a female receiving warfarin who presented with dsypnea. Her international normalized ratio was > 10. Chest radiograph revealed cardiomegaly, and chest computed tomography (CT) showed a bulging pouch-like lesion below the aortic arch greater than 6x6 cm in size and a fluid collection suggesting blood in the pericardium. Thoracic endovascular aneurysm repair (TEVAR) was successfully performed by a cardiovascular surgeon. Aortic pseudoaneurysm formation and leakage may be considered as a rare complication in patients receiving warfarin therapy. Further study regarding warfarin use and the incidence of pseudoaneurysm leakage is needed
Femtosecond laser nanostructuring in glass with sub-50nm feature sizes
We report on controllable production of nanostructures embedded in a porous
glass substrate by femtosecond laser direct writing. We show that a hollow
nano-void with a lateral size of ~40 nm and an axial size of ~1500 nm can be
achieved by manipulating the peak intensity and polarization of the writing
laser beam. Our finding enables direct construction of 3D nanofluidics inside
glass.Comment: 15 pages, 4 figure
On-chip tuning of the resonant wavelength in a high-Q microresonator integrated with a microheater
We report on fabrication of a microtoroid resonator of high-quality (high-Q)
factor integrated with an on-chip microheater. Both the microresonator and
microheater are fabricated using femtosecond laser three-dimensional (3D)
micromachining. The microheater, which is located about 200 micron away from
the microresonator, has a footprint size of 200 micron by 400 micron. Tuning of
the resonant wavelength in the microresonator has been achieved by varying the
voltage applied on the microheater. The drifting of the resonant wavelength
shows a linear dependence on the square of the voltage applied on the
microheater. We found that the response time of the microresonator is less than
10 secs which is significantly shorter than the time required for reaching a
thermal equilibrium on conventional heating instruments such as an external
electric heater
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