4,995 research outputs found
Pengukuran Indeks Biasan Cecair dan Dielektrik Lut Sinar Menggunakan Kaedah Anjakan Alur Laser
Satu kaedah pengukuran indeks biasan cecair dan dielektrik lut sinar
secara anjakan alur Gaussian laser dilaporkan. Pengukuran indeks biasan
air suling, asiton, kaca dan perspek dilakukan pada suhu bilik 21 0 C,
denganjarak gelombang laser BeNe (5mW), 632.8 nm. Nilai-nilai indeks
biasan direkodkan masing-masing sebagai; 1.333, 1.341, 1.537 dan 1.476.
Pengukuran profil alur Gaussian laser dilakukan dengan kaedah anjakan
pinggir mata pisau. Kaedah ini boleh digunakan untuk mengukur indeks
biasan dari jarak gelombang UV hingga jarak gelombang infra merah dan
boleh diubah suai untuk beroperasi secara automatik dengan kawalan
komputer
Collimated directional emission from a peanut-shaped microresonator
Collimated directional emission is essentially required an asymmetric
resonant cavity. In this paper, we theoretically investigate a type of
peanut-shaped microcavity which can support highly directional emission with
the emission divergence as small as 2.5o. The mechanism of the collimated
emission is explained with the short-term ray trajectory and the intuitive lens
model in detail. Wave simulation also confirms these results. This extremely
narrow divergence of the emission holds a great potential in highly collimated
lasing from on-chip microcavities
Broadband opto-mechanical phase shifter for photonic integrated circuits
A broadband opto-mechanical phase shifter for photonic integrated circuits is
proposed and numerically investigated. The structure consists of a
mode-carrying waveguide and a deformable non-mode-carrying nanostring, which
are parallel with each other. Utilizing the optical gradient force between
them, the nanostring can be deflected. Thus the effective refractive indices of
the waveguide is changed with the deformation, and further causes a phase
shift. The phase shift under different geometry sizes, launched powers and
boundary conditions are calculated and the dynamical properties as well as the
thermal noise's effect are also discussed. It is demonstrated that a
phase shift can be realized with only about 0.64 mW launched power and 50 long nanostring. The proposed phase shifter may find potential usage in
future investigation of photonic integrated circuits
2-Amino-1H-benzoimidazol-3-ium 4,4,4-trifluoro-1,3-dioxo-1-phenylbutan-2-ide
In the title compound, C7H8N3
+·C10H6F3O2
−, 1H-benzoimidazol-2-amine system adopts a planar conformation with an r.m.s. deviation of 0.0174 Å. The cation and anion in the asymmetric unit are linked by N—H⋯O hydrogen bonds. There are also additional intermolecular N—H⋯O hydrogen bonds and π–π stacking interactions between the phenyl rings of neighbouring anions with centroid–centroid distances of 4.0976 (13) Å
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