19 research outputs found
Synthesis of Saturated Heterocycles via Metal-Catalyzed Formal Cycloaddition Reactions That Generate a C–N or C–O Bond
Finding the Needle in the Haystack: Characterization of Trace Crystallinity in a Commercial Formulation of Paclitaxel Protein-Bound Particles by Raman Spectroscopy Enabled by Second Harmonic Generation Microscopy
Selective Imaging of Active Pharmaceutical Ingredients in Powdered Blends with Common Excipients Utilizing Two-Photon Excited Ultraviolet-Fluorescence and Ultraviolet-Second Order Nonlinear Optical Imaging of Chiral Crystals
Elucidation of Compression-Induced Surface Crystallization in Amorphous Tablets Using Sum Frequency Generation (SFG) Microscopy
Crystallization and Dissolution Behavior of Naproxen/Polyethylene Glycol Solid Dispersions
Physically Transient Photonics: Random versus Distributed Feedback Lasing Based on Nanoimprinted DNA
The authors report on a room-temperature nanoimprinted, DNA-based distributed
feedback (DFB) laser operating at 605 nm. The laser is made of a pure DNA host
matrix doped with gain dyes. At high excitation densities, the emission of the
untextured dye-doped DNA films is characterized by a broad emission peak with
an overall linewidth of 12 nm and superimposed narrow peaks, characteristic of
random lasing. Moreover, direct patterning of the DNA films is demonstrated
with a resolution down to 100 nm, enabling the realization of both
surface-emitting and edge-emitting DFB lasers with a typical linewidth<0.3 nm.
The resulting emission is polarized, with a ratio between the TE- and
TM-polarized intensities exceeding 30. In addition, the nanopatterned devices
dissolve in water within less than two minutes. These results demonstrate the
possibility of realizing various physically transient nanophotonics and laser
architectures, including random lasing and nanoimprinted devices, based on
natural biopolymers.Comment: 20 pages, 5 figures, 31 reference