مجال
التميز
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تميز دراسي وبحثي
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البحوث المنشورة
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البحث (1):
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عنوان البحث:
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Simulated dynamics of
optically pumped dilute nitride 1300 nm spin vertical-cavity surface-emitting
lasers
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رابط البحث:
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Click here
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تاريخ النشر:
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April 2014
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موجز عن البحث:
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The authors report a
theoretical analysis of optically pumped 1300 nm dilute nitride
spin-polarised vertical-cavity surface-emitting lasers (VCSELs) using the
spin-flip model to determine the regions of stability and instability. The
dependence of the output polarisation ellipticity on that of the pump is
investigated, and the results are presented in two-dimensional contour maps
of the pump polarisation against the magnitude of the optical pump. Rich
dynamics and various forms of oscillatory behaviour causing self-sustained
oscillations in the polarisation of the spin-VCSEL subject to continuous-wave
pumping have been found because of the competition of the spin-flip processes
and birefringence. The authors also reveal the importance of considering both
the birefringence rate and the linewidth enhancement factor when engineering
a device for high-frequency applications. A very good agreement is found with
the experimental results reported by the authors’ group.
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البحث (2):
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عنوان البحث:
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Control of emitted light
polarization in a 1310 nm dilute nitride spin-vertical cavity surface
emitting laser subject to circularly polarized optical injection
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رابط البحث:
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Click here
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تاريخ النشر:
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05-11-2014
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موجز عن البحث:
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We
experimentally demonstrate the control of the light polarization emitted
by a 1310 nm dilute nitride spin-Vertical Cavity Surface Emitting Laser (VCSEL) at
room temperature. This is achieved by means of a combination of polarized optical pumping and
polarized optical injection. Without external injection, the polarization of
the optical pump controls
that of the spin-VCSEL. However, the addition of the externally injected
signal polarized with either left- (LCP) or right-circular polarization (RCP)
is able to control the polarization of the spin-VCSEL switching it at
will to left- or right-circular polarization. A numerical model has
been developed showing a very high degree of agreement with the experimental
findings
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البحث (3):
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عنوان البحث:
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Circular polarization switching and bistability in an
optically injected 1300 nm spin-vertical cavity surface emitting laser
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رابط البحث:
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Click
here
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تاريخ النشر:
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15-01-2015
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موجز عن البحث:
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We report the experimental observation of circular polarization switching
(PS) and polarizationbistability (PB)
in a 1300 nm dilute nitride spin-vertical cavity surface emitting laser (VCSEL). We
demonstrate that the circularly polarized optical signal at 1300 nm can
gradually or abruptly switch the polarization ellipticity of the spin-VCSEL from
right-to-left circular polarization and vice versa. Moreover, different
forms of PS and PB between right- and left-circular polarizationsare observed by controlling the
injection strength and the initial wavelength detuning. These results
obtained at the telecom wavelength of 1300 nm open the door
for novel uses of spin-VCSELs in polarization sensitive applications in future
optical systems
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البحث (4):
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عنوان البحث:
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1305-nm
Quantum Dot Vertical-External-Cavity Surface-Emitting Laser
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رابط البحث:
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Click here
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تاريخ النشر:
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15-07-2015
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موجز عن البحث:
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We report the first room temperature quantum dot (QD)
vertical-external-cavity surface-emitting laser operating at 1305 nm. The
gain structure was composed of 5 × 3 QD layers; each threefold group was
positioned at an antinode of the standing wave of the optical field.
Continuous wave optical output power >0.5 mW with threshold pump power of
21 mW was demonstrated using a very simple and compact laser configuration by
employing a high reflection-coated fiber as the top mirror. Using a
piezoelectric translation stage, the emission wavelength could be tuned over
a 14-nm spectral range.
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البحث (5):
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عنوان البحث:
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1300 nm optically
pumped quantum dot spin vertical external-cavity surface-emitting laser
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رابط إلى البحث:
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Click
here
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تاريخ النشر:
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15/10/2015
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موجز عن البحث:
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We report a room temperature optically
pumped Quantum Dot-based Spin-Vertical-External-Cavity
Surface-Emitting laser (QD Spin-VECSEL) operating at the telecom
wavelength of 1.3 μm. The active medium was composed of 5 ×
3 QD layers; each threefold group was positioned at an antinode of
the standing wave of the optical field. Circularly polarized lasing in the
QD-VECSEL under Continuous-Wave optical pumping has been realized
with a threshold pump power of 11 mW. We further demonstrate at room
temperature control of the QD-VECSEL outputpolarization ellipticity via
the pump polarization.
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المؤتمر (1):
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عنوان المؤتمر:
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The
SIOE 2013 conference from 9th to 11th April 2013
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تاريخ الإنعقاد:
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9 – 11/04/2013
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مكان
الإنعقاد:
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Cardiff,
UK
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طبيعة المشاركة:
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Oral
presentation
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عنوان المشاركة:
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Simulated
dynamics of dilute nitride 1300 nm spin Vertical Cavity Surface Emitting
Lasers
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ملخص المشاركة:
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Recently the
first demonstration of room temperature optical spin-injection in a dilute
nitride 1300 nm VCSEL under continuous-wave optical pumping was reported by
our group. The experimental results showed that the VCSEL polarisation could
be controlled by the polarisation of the 980 nm pump. The six rate equations
of the spin flip model (SFM) were used to simulate this behaviour and very
good agreement was demonstrated with experiment. In the present contribution
the SFM is used to predict the more general dependence of spin-VCSEL output
power and polarisation on the pump power and polarisation for 1300 nm dilute
nitride structures.
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المؤتمر (2):
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عنوان المؤتمر:
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The Conference on Lasers and Electro-Optics
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تاريخ الإنعقاد:
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08 – 13/06/2014
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مكان
الإنعقاد:
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San
Jose, California, USA
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طبيعة المشاركة:
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Oral
presentation
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عنوان المشاركة:
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Control
of the Emitted Polarization in a 1310 nm spin-VCSEL Subject to Circularly
Polarized Optical Injection
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ملخص المشاركة:
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We
report the first optical injection experiment on a dilute nitride 1300 nm
spin-VCSEL at room temperature. Effective control of the polarization of the
light emitted by the spin-VCSEL is theoretically predicted and experimentally
demonstrated.
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المؤتمر (3):
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عنوان المؤتمر:
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The
24th IEEE International Semiconductor Laser Conference
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تاريخ الإنعقاد:
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7-10/09/2014
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مكان
الإنعقاد:
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Palma Malloca, Spain
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طبيعة المشاركة:
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Oral presentation
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عنوان المشاركة:
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1300 nm Quantum Dot
Semiconductor Disk Laser (QD-SDL)
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ملخص المشاركة:
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We report the first quantum dot
semiconductor disk laser operating at 1300 nm under continuous optical
pumping at room temperature. A threshold power of 21 mW and output power
above 0.5 mW have been achieved.
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المؤتمر (4):
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عنوان المؤتمر:
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IEEE
Photonics Conference 2014
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تاريخ الإنعقاد:
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12-16/10/2014
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مكان
الإنعقاد:
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San
Diego, California, USA
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طبيعة المشاركة:
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Oral
presentation
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عنوان المشاركة:
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Polarization
switching and bistability in a 1300 nm spin-VCSEL Subject to Circularly
Polarized Optical Injection
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ملخص المشاركة:
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We
report the first experimental observation of different forms of polarization
switching and bistability in an optically injected 1300nm dilute nitride
spin-VCSEL and for both (right- and left) circularly polarized modes of the
device.
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