Showing 3 results for Microstructure
J. Mostafavi-Amjad, H. R. M Khalesifard,
Volume 2, Issue 1 (2-2008)
Abstract
Micro-channels are made over the Ag+/Na+ ion-exchanged soda-lime glass surface by interaction of an intense Ar+ laser beam and the silver ions inside the glass matrix. The Ar+ laser beam reduces the Ag+ ions inside the matrix. The Ag+ atoms aggregate into silver nano-clusters around the interaction area, inside the glass matrix. Aggregation of the silver atoms and the thermal effects of the interaction, changes the geometrical profile of the glass surface. This phenomenon has been used to produce micro-sized channels over the glass surface. During the interaction the glass has moved under the focused laser beam in two dimensions by resolution of 300 nm via a computer controlled xyz sub-micro-positioner to produce the channel walls. Using this technique, micro-channels of 0.3 μm deep and arbitrary width have been made. The height of the produced wall has been determined by interferometry techniques.
H Pakarzadeh, K Nielsen, A. C Brunetti, K Rottwitt, A Zakery,
Volume 6, Issue 2 (10-2012)
Abstract
A polymethylmethacrylate (PMMA) microstructured polymer
optical fiber (mPOF) is fabricated and characterized. Using the cut-back
technique the fiber loss is measured which is higher than the step-index silica
fibers. Through a novel experimental scheme, the backward Stokes spectrum of
the fabricated mPOF is recorded over a range exceeding 3000 cm‑1
during the cut-back method and compared with that of step-index silica fiber.
Especially, the gain coefficient of the Raman peak at 2950 cm‑1
is directly measured, that is without comparing with other known material. The
results show a very good agreement with those obtained through other
experimental schemes.
Dr. Roghaieh Parvizi,
Volume 6, Issue 2 (10-2012)
Abstract
we investigate the temperature-dependences of the Brillouin frequency shift in three different kind of single-mode fibers using a heterodyne method for sensing temperature. Positive dependences coefficients of 0.77, 0.56 and 1.45MHz/0C are demonstrated for 25 km long single-mode fiber, 10 km long non-zero dispersion shifted fiber and 100 m photonic crystal fiber, respectively. The results indicate that microstructure fibers with a partially Ge-doped small core have great potential for fiber Brillouin distributed sensing.