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CRC Press eBooks

Optical Spin

Preecha Yupapin, Jalil Ali

Published Jul 30, 2013• 0 citations
Publisher

Abstract

Optical add-drop filters have been widely investigated in many areas of application, especially the use of an all-optical device which is formed with a modified add-drop optical filter known as a PANDA ring resonator [1-3]. By using an optical darkbright soliton control arrangement within a semiconductor add-drop multiplexer, promising applications have been observed [4]. In application, one of the advantages is that the dark soliton peak signal is always at low level, which is useful for secured signal communications in the transmission link. The other applications are associated with high-optical-field configurations (such as an optical tweezer or potential well) [5]. Spin manipulation has generated tremendous research progress in many fields, such as the light-shift effect in a rubidium atom [6], magnetic clusters [7], semiconductors [8], GaAs/AlGaAs quantum well [9], carbon nanotubes [10], thinfilm nanomagnets [11], magnetic tunnel junctions [12], and CdTe quantum dots [13]. All of these fields are based on pulsed magnetic resonance technique, which is well developed, but to date the single spin detection still remains a challenging task. The use of photon states for spin manipulation has become a promising technique of investigation, in which photons are the ideal candidates to transmit quantum information with little decoherency. Furthermore, spin states can be used to store and process quantum information due to their long coherence time. Therefore, the investigation of spin manipulation [14,15], spin detection, remote spin entanglement mediated by photons, and quantum-state transfer between photons and spins are of great importance. However, there is still a need to explore aspects of spin coupling and orbital motion of electrons in carbon nanotubes, magnetic manipulations, sidewall oxide effects on spin torque, magnetic field-induced reversal characteristics of thin-film nanomagnets, magnetic vortex oscillator driven by direct spin polarized current, and measurement of the spin transfer torque vector in magnetic tunnel junctions [16,17].

DOI
10.1201/b15379-7

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Optical add-drop filters have been widely investigated in many areas of application, especially the use of an all-optical device which is formed with a modified add-drop optical filter known as a PANDA ring resonator [1-3]. By using an optical darkbright soliton control arrangement within a semiconductor add-drop multiplexer, promising applications have been observed [4]. In application, one of the advantages is that the dark soliton peak signal is always at low level, which is useful for secured signal communications in the transmission link. The other applications are associated with high-optical-field configurations (such as an optical tweezer or potential well) [5]. Spin manipulation has generated tremendous research progress in many fields, such as the light-shift effect in a rubidium atom [6], magnetic clusters [7], semiconductors [8], GaAs/AlGaAs quantum well [9], carbon nanotubes [10], thinfilm nanomagnets [11], magnetic tunnel junctions [12], and CdTe quantum dots [13]. All of these fields are based on pulsed magnetic resonance technique, which is well developed, but to date the single spin detection still remains a challenging task. The use of photon states for spin manipulation has become a promising technique of investigation, in which photons are the ideal candidates to transmit quantum information with little decoherency. Furthermore, spin states can be used to store and process quantum information due to their long coherence time. Therefore, the investigation of spin manipulation [14,15], spin detection, remote spin entanglement mediated by photons, and quantum-state transfer between photons and spins are of great importance. However, there is still a need to explore aspects of spin coupling and orbital motion of electrons in carbon nanotubes, magnetic manipulations, sidewall oxide effects on spin torque, magnetic field-induced reversal characteristics of thin-film nanomagnets, magnetic vortex oscillator driven by direct spin polarized current, and measurement of the spin transfer torque vector in magnetic tunnel junctions [16,17].
In this paper, we have shown that the two components (TE and TM waves) of polarized light are manipulated by using the orthogonal soliton pair within a PANDA ring resonator known as a dark-bright soliton pair. In operation, the orthogonal soliton sets can be generated by using the system. The optical field is fed into the ring resonator system, which is controlled by an optical switch by using a single microring. To form the initial spin states, the magnetic field is induced by an aluminum plate (Al) coupled on AlGaAs waveguides for optoelectronic spin-up and - down states. The optoelectronic spin is formed by using the TE and TM wave components. In this manipulation, the electromagnetic radiation is formed by using the orthogonal soliton pulses. In fact, they are photons, which behave like elementary particles. Hence, the spin axis of photon is always parallel to its direction of motion. Many orthogonal sets are also available and existed, in which the spin conservation of many particles is maintained for large scale system use. Therefore, for future applications, the use for high performance storage, low power magnetic logic, quantum logic, quantum gate, nano antenna, nano radio, and applications of spintronic sensing can be realized based on realistic device parameters.
Abstract By using the optical add‐drop filter which is formed by a microring resonator.After a dark soliton pulse is fed into an input port of the add‐drop filter, the orthogonal soliton pair (dark and bright solitons) can be formed within the system and detected simultaneously at the output ports. Under the resonant condition, the conversion of dark and bright solitons corresponding to the left‐hand and right hand soliton orientations can be generated and seen. Whenever a soliton(photon) is absorbed by an object, an angular momentum of either +h or −h is imparted to the object, in which two possible soliton states known as soliton spins are exhibited and confirmed by the helical phase presentation. In application, the train of orthogonal solitons, that is, many solitons (photons) with slightly different wavelengths can be generated by using the modified add‐drop filter, which is available for many soliton spin investigations. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1100–1103, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26671
A new concept of an optical spin generation using bright and dark soliton conversion behaviors within a modified optical add–drop filters known as a PANDA ring resonator is proposed. The orthogonal solitons can be formed randomly within the system and detected simultaneously at the output ports. Under the resonant condition, the orthogonal solitons corresponding to the left-hand and right-hand solitons (photons) can be generated. Whenever a photon is absorbed by an object, an angular momentum of either +ℏ or -ℏ is imparted to the object, in which two possible spin states known as soliton spins are exhibited. Many soliton spins, i.e., many particles, dynamic spin and long distance spin transport using the proposed design are also discussed.
By using the optical add-drop filter which is formed by a microring resonator, and after a dark soliton pulse is fed into an input port of the add-drop filter, the orthogonal soliton pair (dark and bright solitons) can be formed within the system and detected simultaneously at the output ports. Under the resonant condition, the conversion of dark and bright solitons corresponding to the left-hand and right-hand soliton orientations can be generated and seen. Whenever a soliton (photon) is absorbed by an object, an angular momentum of either +ℏ or -ℏ is imparted to the object, in which two possible soliton states known as soliton spins are exhibited and confirmed by the helical phase presentation. In application, the train of orthogonal solitons, i.e. many solitons (photons) with slightly different wavelengths can be generated by using the modified add-drop filter, which is available for many soliton spins and long distance spin transport investigations.
Optical buffer is recognized as an essential component in a wavelength router, in which packets of data can be stored for resolving packet contention problem and also to delay the outgoing packets [1-2]. In practice, optical router patents have been proposed and recorded [3-5], which can be useful for various applications. Recently, promising techniques of microscopic volume trapping and transportation within an add/drop multiplexer have been reported in both theory [6]and experiment [7], respectively. The transporter in these techniques is known as an optical tweezer. The technique for generating optical tweezers has become a powerful tool for manipulating of micrometer-sized particles. Useful static tweezers have now been well recognized and realized. The use of dynamic tweezers has also been realized in practical works [8-10]. Schulz et al. [11] have shown that trapped atoms between can be transported between two optical potentials. Optical tweezers use forces exerted by intensity gradients in strongly focused beams of light to trap and move nanoscopic volumes of matter. During the movement, another combination of forces is induced between photons due to their interactions caused by photon scattering effects. The field intensity can also be adjusted and tuned to the desired gradient field and scattering force so that the suitable trapping force can be formed. Thus, by configuring the appropriated force for the transmitter/ receiver part, nanoscopic particles can be transported over a long distance. In this chapter, the methods for generating the dynamic optical tweezers/vortices using a dark soliton, a bright soliton and a Gaussian pulse propagating within an add/drop optical multiplexer with two nanoring resonators (PANDA ring resonator) will be discussed. The dynamic behaviors of a soliton and Gaussian pulses are well described. [12]. By using the proposed system, the transceiver can be integrated to form a single device. The transceiver can be used to transport nanoscopic volumes of matter [13], especially, molecules in liquid core waveguide [14, 15], drugs, and DNA, where a buffer is needed before the substance reaches its destination.