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Geometry-Driven Performance of Unit Cells in Multiband Reflective Metasurfaces: A Comparative Study
(2025-01-01)
Taufiqqurrachman
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Rahim, Mohamad Kamal B.A.
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Samsuri, Noor Asmawati Binti
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Wijayanto, Yusuf Nur
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Yaziz, Nur Syahirah Mohd
A multiband reflective metasurface can be designed using a multi-ring resonator, where the resonator can take various shapes such as circular, square, hexagonal, triangular, and others. This paper presents a comparative study of unit-cell multiband reflective metasurfaces based on their geometric structure, focusing on reflection magnitude, reflection phase, and bandwidth performance of hexagonal and triangular shapes. Both proposed designs are designed and simulated at X-band frequencies using an F4BMX220 substrate with a thickness of 1.5 mm. Simulation results show that the hexagonal shape offers better reflection performance and a wider bandwidth compared to the triangular shape.
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Optical Hash Function for High Speed and High Security Algorithm using Ring Resonator System
(2021-04-01)
Juleang, Pakom
;
Mitatha, Somsak
This work presents a novel security technique using the optical hash function to create a message digest algorithm in the wavelength domain. The optical devices used for high speed and high security algorithm handling comprised a PANDA ring resonator connected with an add/drop filter system. The PANDA ring resonator was introduced to access the dynamic behavior of bright-bright soliton collision within the modified add/drop filter. Outputs of the dynamic states formed key suppression as a high security application for optical cryptography. The add/drop filter was an essential device in the proposed design for optical hash function processing. Simulation outputs proved that the proposed technique obtained optical hash function in the wavelength domain for real time message digest creation. The wavelength of the data must be within 40% of the center wavelength of the system input signal. The integrity of the data was maintained by this highly secure process.
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Optical Checksum in Multi Tunnels for High Speed Error Detection using Ring Resonator System
(2021-03-10)
Juleang, Pakorn
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Mitatha, Somsak
A novel optical checksum high speed approach for error detection is proposed for use in a multi tunnel wavelength domain. By using this technique, all processes were performed by passing light through optical hardware (PANDA ring resonator together with add/drop filter). Outputs achieved from dynamic states utilizing the bright-dark soliton conversion control was utilized to secure the optical checksum creation process. The add/drop filter was utilized as an essential device in the proposed system. The results proved that the proposed design could achieve optical checksum in wavelength domain for real time error detection. This method could also quickly create and check the accuracy of information using optical processes. The wavelength of the multi tunnels must be within 50% of the center wavelength of the input signal system to maintain data integrity for optical communication.
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Optical asymmetric key cryptography in RoFSO for high security using ring resonator system
(2019-07-01)
Mitatha, Somsak
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Chaiyasoonthorn, Sawatsakorn
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Juleang, Pakorn
A new method for highly secured wireless transmission was proposed as optical asymmetric key cryptography in RoFSO. The optical equipment used for handling high security communication was a PANDA ring resonator and an add/drop filter. A PANDA ring resonator used the dynamic behavior of bright-bright soliton collision. The outputs of the dynamic states were used to form key suppression and key generation as a communication security application. An add/drop filter was used to recover the optical key from suppression and generate an optical asymmetric key (key for sending and key for receiving). Simulation results showed that the proposed design achieved optical asymmetric key cryptography in RoFSO. The sender's data was not perceived by an interferer because the ciphertext data signal was covered by a noiselike signal in a frequency domain of tunnel's form like a noiselike signal.
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Highly secured tunnel by optical crypto carrier transmission using ring resonator system
(2017-11-03)
Soysouvanh, Saysamone
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Mitatha, Somsak
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Juleang, Pakorn
A new optical data transmission technique through a highly secure tunnel using a crypto carrier was investigated. High speed, high-security communication was achieved with an add/drop filter system and PANDA ring resonator optical equipment. The technique employed coding-decoding generated by public and private optical keys in frequency and time domains using a high-security tunnel. This novel technique provided high speed optical communication using light processing without electric control circuits. Restrictions on the operation of various equipment parameters affected the optical data communication signal intensity. The suitable signal ray data intensity was less than 200% of the signal ray intensity used for generating the optical public and private keys. This new technique ran and transmitted encrypted data efficiently to the receiver.
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Optical private tunnel using a ring resonator system for security communication
(2013-12-31)
Juleang, Pakorn
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Mitatha, Somsak
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Yupapin, Preecha P.
We propose optical private tunnel using the dark-bright soliton conversion control in a modified add/drop optical filter. By using the control arrangement, the obtained outputs of the dynamic states of dark-bright soliton can be used to form the key suppression which can be available for communication security application, where finally, the key recovery can be obtained by controlling the add/drop filter outputs. The optical private tunnel system consists of data sending section, key learning section and peering section that use an add/drop filter which is used to generate the shape of tunnel from the optical keys, and a Mach-Zehnder interferometer is also used for multiplexing and de-multiplexing operations. The simulation results obtained have shown that the proposed system can be achieved, which can be used to form high security communication. © 2013 IEEE.
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Optical bistability investigation in a nonlinear silicon microring circuit
(2013-02-18)
Chiangga, Surasak
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Pitakwongsaporn, Santhad
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Frank, Till D.
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Yupapin, Preecha P.
We describe the optical bistability phenomenon in a silicon-on-insulator microring resonators device by using an analytical theory, which includes both linear and nonlinear effects such as two-photon absorption, Kerr effect, free carrier and thermo-optic effect (TOE). We show that the bistable switching threshold and the hysteresis loop width can be tuned by geometrical parameters of the device and by the nonlinear parameters. The accuracy of the analytical approach is verified by comparing the spectrum responds with the predicting data from a commercial finite-difference time-domain software tool, and a very close agreement is found between the two when TOE is incorporated in analytical theory. In addition, our analysis reveals that a new type of hysteresis loop occurs at low input intensity. The mode suppression of the designed device by Vernier effect for tunable filter applications is also briefly discussed. © 2012 IEEE.
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Linear and nonlinear behaviors of light in a silicon ring resonator
(2011-05-01)
Vanishkorn, B.
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Kusalajeerung, C.
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Chiangga, S.
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Pitukwongsaporn, S.
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Jukgoljun, B.
We have investigated the nonlinear switching characteristics of an optical device using a double-coupler silicon ring resonator in the presence of the linear losses, the Kerr nonlinearity, two-photon absorption, free-carrier-induced absorption and dispersion, and thermo-optic, in which the general features of the nonlinear switching of the throughput and drop port signals are similar to a single-couple ring resonator and nonlinear Fabry-Perot resonator results, respectively. The interesting results of the double-coupler silicon ring resonator are the low switching power conditions and the linear amplification gain, in which the various applications can provide by controlling the input-output characteristic of silicon-based resonators, for instance, by controlling the coupling ratio, free-carrier lifetime, and input wavelength, which can provide the multiple applications for optical switches, logic gates, and memories. © 2011 Wiley Periodicals, Inc.
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Nonlinear switching in silicon-based ring resonators
(2011-02-01)
Kusalajeerung, Channarong
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Chiangga, Surasak
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Pitukwongsaporn, Santad
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Yupapin, Preecha P.
In this paper, we analyzed and investigated the nonlinear switching characteristics of an optical device using a double-coupler silicon ring resonator in the presence of the linear losses, the Kerr nonlinearity, two-photon absorption, thermo-optic effects, free-carrier-induced absorption, and dispersion. Results obtained have shown that the general features of the nonlinear switching of the throughput and drop port signals are similar to a single-couple ring and nonlinear Fabry-Perot resonators, respectively. The interesting results of the double-coupler silicon ring resonator are the low switching power conditions and the linear amplification gain. The various applications can be provided by controlling the input-output of silicon-based resonators, for instance, by controlling the coupling ratio, free-carrier lifetime, and input wavelength, in which the multiple applications for optical switches, logic gates, and memories can be provided. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).
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Design of triple-mode ring resonator for wideband microstrip bandpass filters
(2010-11-01)
Srisathit, Kunnthphong
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Worapishet, Apisak
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Surakampontorn, Wanlop
A triple-mode microstrip ring resonator core for the design of bandpass filters is proposed in this paper. It is a modification of the conventional single-mode ring resonator with a pair of open-ended coupled lines and a shunt open stub for a transmission-line path of the ring substituted to form a triple-mode resonator. Since the triple-mode resonator possesses three resonances, one at the center frequency and the other two near the edges of the passband, a flat passband response can be achieved when it is employed to implement a bandpass filter. The resonator also exhibits attenuation poles close to the edges of the passband, thereby offering sharp rejection in the bandpass filter response. Moreover, since the signal applied at the input port is effectively forced to travel mainly through the transmission line path over the passband frequency, the loss incurred by the coupled lines is minimized. Extensive theoretical analysis of the triple-mode ring and design example of the bandpass filter prototypes based on the ring structure are given. The prototype filters's performance is validated through both simulations and experiments, where good agreement with the theoretical prediction is observed. © 2006 IEEE.

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