Biomedical Engineering Reference
In-Depth Information
In PCF golden wires
Multi-core PCF
10 μm
Figure 26.2
(See companion CD for color igure.)
.Fabrication.examples.of.the.proposed.multifunctional.probe..(Reproduced.
by.permission.from.Springer.Science+Business.Media:.
BioNanoSci.,
.Biomedical.super.resolved.imaging.using.
special.micro-probe,.1(3),.2011,.103-109,.Shahmoon,.A.,.Slovin,.H.,.and.Zalevsky,.Z..Copyright.2011.)
made.out.of.two.different.types.of.metals..The.metals.can.also.be.used.to.transmit.radio.
frequency.(RF).radiation.for.radiating.the.treated.tissue.
Figure.26.2.presents.a.microscope.image.of.a.preliminary.fabrication.attempt.of.a.multi-
functional. probe,. that. is,. following. the. multifunctional. concept. previously. described. in.
Zalevsky.et.al..(2005)..Note.that.the.preliminary.fabrication.attempt.of.Figure.26.2.aims.to.
demonstrate.mainly.the.capability.of.multifunctionality.by.fabricating.ibers.with.optical.
cores.interlaced.with.metallic.nanowires..Yet,.in.that.speciic.example,.the.number.of.opti-
cal.cores.is.very.low.and.thus.it.is.not.suficient.for.realizing.high.quality.imaging.
In.order.to.be.able.to.fabricate.a.iber.incorporating.both.photonic.cores.made.out.of.silica.
together.with.metallic.wires,.one.needs.to.realize.a.pre-form.from.materials.having.rela-
tively.close.melting.temperature.so.that.when.the.pre-form.is.being.drawn.into.a.iber,.the.
melting.for.all.materials.involved.occurs.with.similar.timing..This.is.important.for.realizing.
uniform.and.axially.continuous.electrical.wires.as.well.as.for.keeping.uniform.and.identical.
dimensions.of.the.structures/components.appearing.in.the.cross.section.of.the.iber.
The.left.image.of.Figure.26.2.shows.a.multi-core.iber.with.seven.optical.cores.(with.red.
light.coupled.to.them.at.the.upper.right.corner.of.that.image),.while.the.right.image.shows.
a.iber.with.several.golden.wires.integrated.along.its.cross.section..This.probe.was.made.
out.of.silica.and.its.metallic.wires.were.made.from.gold.
The.second.fabrication.attempt.on.which.we.focus.in.this.chapter.is.related.to.the.fab-
rication. of. a. multi-core. iber. without. interlaced. metallic. wires. but. with. a. large. number.
of.optical.cores.to.allow.high.resolution.imaging.functionality.where.the.high.resolution.
imaging.is.performed.through.the.described.endoscope..The.number.of.fabricated.cores.
in.this.iber.was.about.5,000-10,000..This.micro.probe.was.made.out.of.polymers,.while.
the.core.was.made.out.of.PS.(polystyrene).and.the.cladding.was.made.out.of.poly(methyl.
methacrylate).(PMMA)..The.refractive.indexes.of.the.PS.and.the.PMMA.at.a.wavelength.of.
632.nm.are.1.59.and.1.49,.respectively.
Figure.26.3.presents.the.realized.micro.probe.which.was.15.cm.long..In.order.to.polish.
the.edge.of.the.micro.probe.iber.and.to.achieve.better.roughness,.we.used.special.hold-
ers.(shown.on.the.right.side.of.Figure.26.3)..The.special.holders.are.temporarily.attached.
to.both.sides.of.the.micro.probe.only.for.the.polishing.phase.and.are.removed.afterward.
(shown.on.the.left.side.of.Figure.26.3).
