KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 10 of 13

Some of the metrics are blocked by your
consent settings
All-optical logic and and or gates generated by dark-bright soliton conversion
(2013-03-01)
Phongsanam, P.
;
Teeka, C.
;
Jomtarak, R.
;
Mitatha, S.
;
Yupapin, P. P.
In this paper, a novel system of simultaneous optical logic AND and OR gates using dark-bright soliton conversion within the add/drop optical filter system is proposed. By using the dark-bright soliton conversion concept, the switching output signal response time of ns can be obtained. The input logic <! - no-mfc - >'0'<! - /no-mfc - > and control logic <! - no-mfc - >'0'<! - /no-mfc - > are formed by using the dark soliton pulse (D) trains. We found that the simultaneous optical logic AND and OR gates at the drop and through ports can be formed, respectively. The comparison data of the commercial system is also given, which is shown that the proposed system has the advantage over the commercial ones. © 2012 Elsevier GmbH. All rights reserved.
Some of the metrics are blocked by your
consent settings
Gold nanoparticle trapping and delivery for therapeutic applications
(2012-02-10)
Aziz, M. S.
;
Suwanpayak, Nathaporn
;
Jalil, Muhammad Arif
;
Jomtarak, R.
;
Saktioto, T.
A new optical trapping design to transport gold nanoparticles using a PANDA ring resonator system is proposed. Intense optical felds in the form of dark solitons controlled by Gaussian pulses are used to trap and transport nanoscopic volumes of matter to the desired destination via an optical waveguide. Theoretically, the gradient and scattering forces are responsible for this trapping phenomenon, where in practice such systems can be fabricated and a thin-film device formed on the specific artifcial medical materials, for instance, an artificial bone. The dynamic behavior of the tweezers can be tuned by controlling the optical pulse input power and parameters of the ring resonator system. Different trap sizes can be generated to trap different gold nanoparticles sizes, which is useful for gold nanoparticle therapy. In this paper, we have shown the utility of gold nanoparticle trapping and delivery for therapy, which may be useful for cosmetic therapy and related applications. © 2012 Aziz et al.
Some of the metrics are blocked by your
consent settings
Geometrically distributed 1D photonic crystals for light-reflection in all angles
(2012-01-01)
Jomtarak, R.
;
Teeka, C.
;
P. Yupapin, P.
In this paper, we presented the general formulation of light reflection using a series of 1D PCs with different periods, made of non-absorptive materials of any refractive indices. In order to have a large bandgap - the spectral range of reflection, the periods of 1D PCs must be distributed in a geometrical progression with a common ratio, r, smaller than a maximum value of r<inf>c</inf>. The paper have presented exact expressions for r<inf>c</inf>, bandgap to mid gap ratio of the PC hetero-structure, and the minimum number of PCs to achieve the desired range of bandgap in single and all angles of incidence. The proposed method can be used to design filters for vast range of applications such as UV filters (i.e., sunglasses, eye safety glasses, UV photography filters) and visible light filters. © 2010 Published by Elsevier Ltd.
Some of the metrics are blocked by your
consent settings
Retraction:All-optical switches based-on GaAs/AlAs quantum dots vertical cavities
(2012-01-01)
Teeka, C.
;
Jomtarak, R.
;
P. Yupapin, P.
In this paper, we present an all-optical switch based on self-assembled GaAs/AlAs quantum dots (QDs) within a vertical cavity. Two essential aspects of this novel device have been investigated, which includes the QD/cavity nonlinearity with appropriately designed mirrors and the intersubband carrier dynamics inside QDs. Verticalreflection- type switches have been investigated with an asymmetric cavity that consists of 12 periods of GaAs/Al0.8Ga0.2As for the front mirror and 25 periods for the back mirror. The thicknesses of the GaAs and AlGaAs layers are chosen to be 89 and 102 nm, respectively. To give a dot-in-a-well (DWELL) structure, 65nm dimension of Si was deposited within an 20nm AlAs QW. All-optical switching via the QD excited states has been achieved with a time constant down to 750 fs, wavelength tunability over 29.5 nm. These results demonstrate that QDs within a vertical cavity have great advantages to realize low-power consumption polarization-insensitive micrometer-sized switching devices for the future optical communication and signal processing systems. © 2010 Published by Elsevier Ltd.
Some of the metrics are blocked by your
consent settings
ASK-to-PSK generation based on nonlinear microring resonators coupled to one MZI arm
(2011-11-11)
Teeka, C.
;
Songmuang, S.
;
Jomtarak, R.
;
Yupapin, P. P.
;
Jalil, M. A.
We present a new concept of ASK-to-PSK generation based on nonlinear microring resonators coupled to one MZI arm by using OptiWave FDTD method. By microring resonator increase from one to three microring (SR to TR), we found that the amplitude shift keying (ASK) are increase exactly and the phase shift keying (PSK) is equal to π. © 2011 American Institute of Physics.
Some of the metrics are blocked by your
consent settings
Single electron-hole pair generation using dark-bright solitons conversion control
(2011-11-11)
Jomtarak, R.
;
Teeka, C.
;
Yupapin, P. P.
;
Ali, J.
In this paper, we present the new concept of single electron-hole pair generation by using dark-bright solitons conversion control based on microring resonator coupled to one arm MZI. By using some suitable parameters and found that the single electron-hole pair are seen, therefore, the single electron-hole pair generate can be storage and controll within the design system. © 2011 American Institute of Physics.
Some of the metrics are blocked by your
consent settings
A new concept of multi electron-hole pair generation using dark-bright soliton conversion control
(2011-08-08)
Punthawanunt, S.
;
Teeka, C.
;
Jomtarak, R.
;
Mitatha, S.
;
Ali, J.
In this paper, we have derived and presented a new concept of multi electron-hole pair generation by using dark-bright soliton collision within the modified add/drop filter, which it is known as PANDA ring resonator. By using the dark-bright soliton conversion control, the obtained outputs of the dynamic states can be used to form the multi electron-hole pair, which can be available for communication security application. © 2011 American Institute of Physics.
Some of the metrics are blocked by your
consent settings
Single electron-hole pair generation using dark-bright solitons conversion control
(2011-05-02)
Punthawanunt, S.
;
Jomtarak, R.
;
Teeka, C.
;
Yupapin, P. P.
;
Ali, J.
In this paper, we present the new concept of single electron-hole pair generation by using dark-bright solitons conversion control based on microring resonator coupled to one arm MZI. By using some suitable parameters and found that the single electron-hole pair are seen, therefore, the single electron-hole pair generate can be storage and controll within the design system.
Some of the metrics are blocked by your
consent settings
A new concept of multi electron-hole pair generation using dark-bright soliton conversion control
(2011-05-02)
Punthawanunt, S.
;
Teeka, C.
;
Jomtarak, R.
;
Mitatha, S.
;
Ali, J.
In this paper, we have derived and presented a new concept of multi electron-hole pair generation by using dark-bright soliton collision within the modified add/drop filter, which it is known as PANDA ring resonator. By using the dark-bright soliton conversion control, the obtained outputs of the dynamic states can be used to form the multi electron-hole pair, which can be available for communication security application.
Some of the metrics are blocked by your
consent settings
ASK-to-PSK generation based on nonlinear microring resonators coupled to one MZI arm
(2011-05-02)
Tanaram, C.
;
Teeka, C.
;
Jomtarak, R.
;
Yupapin, P. P.
;
Jalil, M. A.
We present a new concept of ASK-to-PSK generation based on nonlinear microring resonators coupled to one MZI arm by using OptiWave FDTD method. By microring resonator increase from one to three microring (SR to TR), we found that the amplitude shift keying (ASK) are increase exactly and the phase shift keying (PSK) is equal to π.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results