Silicon cored optical fibers fabrication and optical characterization

surprisesameSemiconductor

Nov 1, 2013 (4 years and 2 months ago)

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1

矽核光纖的製備與光學特性量測


Silicon cored optical fibers




fabrication and optical characterization

報告人:王倫

教授

lon@ntu.edu.tw

2013
-
07
-
12

Acknowledgement


Coworkers:


Yi
-
Chuan Tseng, Yan
-
Bo Huang


Prof.
Hsuen
-
Li
Chen

(Department of Material


Science and Engineering)



Monthly discussion with the joint team members


from Dr.
Ching
-
Fuh

Lin, Dr. Wing
-
Kit
Choi

and


Dr. Chao
-
Hsin

Wu.


This work is supported by International
Collaboration
Project with Peking
University (Grant No. NTU
-
ICRP
-
102R7558
)


.

2

Outline


Motivation

and Prior Arts


Design and
Fabrication



Experiment Results



Discussion



Summary



3


Optical fibers are silica based for communication/sensing


Pros and Cons


Semiconductor devices
--

Si based for electronics, III
-
V
for light sources


Pros and Cons


Semiconductor fibers ??


Many unknowns with expected pros and cons


Potential Applications


mid
-
Infrared


Nonlinear


Silicon photonics


Sensing


4

Motivation

Sand


abundant supply for
making glass fibers and Si
chips, a blessing from
Heaven

to whom we should
be grateful.

Research Groups Worldwide


Southampton University


Clemson University


Pen. State University

5

Properties of Semiconductor Fibers


Optics


Size:
a few microns depending on transmission or
sensing


Low transmission loss


Crystalline, smooth interface or surface


Doping for light sources


Rare earth elements


Electronics


Size:
microwire

to nanowire


Good conductivity


Crystalline better than poly and amorphous


Doping for n
-

and p
-
type


E
-
O integration:
22nm node
and below, placement, etc.


6

Prior Arts

7

Pier J. A.
Sazio

et al
, Southampton

University, Science Vol. 311 No. 1583 (2006)

fabricated by using HPCVD

carrier
mobility
1.05
cm
2
/
Vs

vs.

t
ypical Si FET 10^4
-
10^5
cm
2
/
Vs

11mm long,
dia.
100um, core 5um

r
elatively easy in control on crystalline
direction, roughness and
diffusion.

loss
3dB/cm

8

P. J. A.
Sazio

et al
,

Southampton university,

OE Vol. 20 No.4 (2012)

John
Ballato

et al
,

Clemson university,

OE Vol. 16 No.23 (2008)

fabricated by using CVD

fabricated by using molten core method

Prior Arts

a few meter long, loss
5~7dB/cm


9

P. J. A.
Sazio

et al
, Southampton university,

Nature photonics, Vol. 6 No.174 (2012)

Prior Arts

amorphous p
-
n junction

Toward useful junction based devices

OE conversion with a pulsed laser

10

JLT Vol. 27 No.15 (2009)

pure SiO
2

micro fiber

Well, Our Prior Arts

Uniqueness: several meters long with below nm surface
roughness

Using conventional SMF as
preform

Micro
Coil

Rings

11

FSR = 270pm

Resolution: 5pm

Spectrum of 2
-
ring Coil

A
typical photograph of an MCR
whose gaps between adjacent rings
are controlled within 1.5
μm
.

Experiment Results

optical microscope images

c

a.
Cross section of Si cored
fiber

b.
Lateral view of Si cored
fiber

c.
Lateral view of silicon
core


Visual inspection

13





Results and Discussion

crystalline characterization

Chil
-
Chyuan

Kuo
, J. Russ. Laser Res., vol. 32, pp. 12 (2011)

B.L. Boyce et al.,
Acta

Materialia
,

vol. 58, pp. 439 (2010)

Boundaries can be observed for
a
-

and poly
-
Si when FE
-
SEM is
used.

P.
Hashemi

et al, University of Tehran, Conference of Microelectronics,

pp. 326 (2005)





Results and Discussion

Raman characterization



to know possible causes for crystalline

Summary


Long Si
-
cored silica
-
clad fibers were made.


Their propagation losses were measured, and
crystalline properties characterized.


15

Thanks for your attention!


Questions?


Dreams?

16