D. Conteduca, G. Brunetti, G. Pitruzzello, K. Dholakia, T. Krauss, C. Ciminelli
Nanophotonic structures optimise the strength of optical forces, enabling trapping at the nanoscale. To improve the impact of nanotweezers in biological studies, it is necessary to move from individual traps to large multiplexed arrays. Here, we discuss the state-of-the-art of nanotweezers for multiplexed trapping, describing advantages and drawbacks of the configurations that have demonstrated the strongest impact in this field. Finally, we focus on our latest results with a dielectric metasurface that supports strong resonances with thousands of trapping sites. We demonstrate near-field enhancement and simulate trapping performance for 100 nm particles, verifying the possibility to trap > 1000 particles with a low total power of P < 30 mW. The multiplexed trapping with dielectric metasurfaces can open up new biological studies on viruses and vesicles.
{"title":"Multiplexed near-field optical trapping","authors":"D. Conteduca, G. Brunetti, G. Pitruzzello, K. Dholakia, T. Krauss, C. Ciminelli","doi":"10.1117/12.2636025","DOIUrl":"https://doi.org/10.1117/12.2636025","url":null,"abstract":"Nanophotonic structures optimise the strength of optical forces, enabling trapping at the nanoscale. To improve the impact of nanotweezers in biological studies, it is necessary to move from individual traps to large multiplexed arrays. Here, we discuss the state-of-the-art of nanotweezers for multiplexed trapping, describing advantages and drawbacks of the configurations that have demonstrated the strongest impact in this field. Finally, we focus on our latest results with a dielectric metasurface that supports strong resonances with thousands of trapping sites. We demonstrate near-field enhancement and simulate trapping performance for 100 nm particles, verifying the possibility to trap > 1000 particles with a low total power of P < 30 mW. The multiplexed trapping with dielectric metasurfaces can open up new biological studies on viruses and vesicles.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"98 1","pages":"1219803 - 1219803-4"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75229719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ravindra Kumar, Ajay Kumar, J. Saha, S. Chakrabarti
In current study, the variation of sub-capping thickness of InGaAs strain reducing layer (SRL) of InAs quantum dot heterostructure using digital alloy approach is presented. The thickness of 6 nm SRL of conventional structure (sample A) is divided equally with 2 nm thickness (sample B) by using digital alloy approach. Further, using such approach, this thick 6 nm capping is divided in unequal fashion for sample C (1 nm, 2 nm and 3 nm) and sample D (3 nm, 2 nm and 1 nm) from InAs QD towards top GaAs layer. The In-content inside the SRL of the sample A is 15%, whereas, In-content inside the divided-SRL is considered as 45%, 30% and 15% for all other samples. Such composition of SRLs helps in reducing the In-out diffusion, minimizing the lattice mismatch at InAs QD-SRL and SRL-top GaAs layer interfaces, and also reduces the strain inside the overall heterostructures. Two strains, namely hydrostatic and biaxial are calculated by using Nextnano for all the structures and compared simultaneously. The hydrostatic strain inside the QD of sample D is reduced by 4.74%, 1.07% and 2.269% and the biaxial strain inside the QD of sample D is improved by 1.66%, 0.696% and 1.276% as compared to that of samples A, B and C, respectively. The computed PL emission of samples A, B, C and D are observed to be 1305 nm, 1365 nm, 1349 nm and 1375 nm, respectively. Hence, sample D is the optimum choice for fabricating future opto-electronic devices.
{"title":"A comparative analysis of InAs quantum dot heterostructure with equal and varying sub-capping layer thickness using digital alloy approach","authors":"Ravindra Kumar, Ajay Kumar, J. Saha, S. Chakrabarti","doi":"10.1117/12.2633322","DOIUrl":"https://doi.org/10.1117/12.2633322","url":null,"abstract":"In current study, the variation of sub-capping thickness of InGaAs strain reducing layer (SRL) of InAs quantum dot heterostructure using digital alloy approach is presented. The thickness of 6 nm SRL of conventional structure (sample A) is divided equally with 2 nm thickness (sample B) by using digital alloy approach. Further, using such approach, this thick 6 nm capping is divided in unequal fashion for sample C (1 nm, 2 nm and 3 nm) and sample D (3 nm, 2 nm and 1 nm) from InAs QD towards top GaAs layer. The In-content inside the SRL of the sample A is 15%, whereas, In-content inside the divided-SRL is considered as 45%, 30% and 15% for all other samples. Such composition of SRLs helps in reducing the In-out diffusion, minimizing the lattice mismatch at InAs QD-SRL and SRL-top GaAs layer interfaces, and also reduces the strain inside the overall heterostructures. Two strains, namely hydrostatic and biaxial are calculated by using Nextnano for all the structures and compared simultaneously. The hydrostatic strain inside the QD of sample D is reduced by 4.74%, 1.07% and 2.269% and the biaxial strain inside the QD of sample D is improved by 1.66%, 0.696% and 1.276% as compared to that of samples A, B and C, respectively. The computed PL emission of samples A, B, C and D are observed to be 1305 nm, 1365 nm, 1349 nm and 1375 nm, respectively. Hence, sample D is the optimum choice for fabricating future opto-electronic devices.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"34 2","pages":"122000E - 122000E-7"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72567026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Benzaouia, J. Joannopoulos, Steven G. Johnson, A. Karalis
We present a systematic and computationally efficient methodology to design scattering responses for lossless reciprocal 2-port systems, emphasizing compact high-order standard filters. Our approach is based on universal analytical criteria for the resonances (quasi-normal modes) of the structure, which can be used as tractable optimization (root-finding) objectives. We demonstrate our method by designing multiple microwave metasurfaces configured for polarization-preserving transmission, reflective polarization conversion, or diffractive anomalous reflection, and exhibiting responses that precisely match standard bandpass or bandstop filters of various types, orders and bandwidths, with focus on the best-performing elliptic filters.
{"title":"Systematic design of metasurface scattering spectra using analytical criteria on resonances","authors":"M. Benzaouia, J. Joannopoulos, Steven G. Johnson, A. Karalis","doi":"10.1117/12.2633739","DOIUrl":"https://doi.org/10.1117/12.2633739","url":null,"abstract":"We present a systematic and computationally efficient methodology to design scattering responses for lossless reciprocal 2-port systems, emphasizing compact high-order standard filters. Our approach is based on universal analytical criteria for the resonances (quasi-normal modes) of the structure, which can be used as tractable optimization (root-finding) objectives. We demonstrate our method by designing multiple microwave metasurfaces configured for polarization-preserving transmission, reflective polarization conversion, or diffractive anomalous reflection, and exhibiting responses that precisely match standard bandpass or bandstop filters of various types, orders and bandwidths, with focus on the best-performing elliptic filters.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"5 1","pages":"1219502 - 1219502-5"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84394126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We numerically investigate characteristics of spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) under injection locking by using spin-flip rate equations. Generation of a modulation sideband whose phase is correlated with an injected light into a spin-VCSEL, is an attractive application of spin-VCSELs to frequency-shifted local oscillators in coherent optical communication systems. Our results indicate that the spin polarization modulation with a high degree of spin polarization is important for efficient generation of strong modulation sideband. Additionally, matching the modulation frequency and polarization mode splitting in the spin-VCSEL contribute to achieve efficient and ideal single sideband generation.
{"title":"Injection-locked spin-VCSELs for coherent optical communications","authors":"N. Yokota, K. Ikeda, H. Yasaka","doi":"10.1117/12.2632872","DOIUrl":"https://doi.org/10.1117/12.2632872","url":null,"abstract":"We numerically investigate characteristics of spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) under injection locking by using spin-flip rate equations. Generation of a modulation sideband whose phase is correlated with an injected light into a spin-VCSEL, is an attractive application of spin-VCSELs to frequency-shifted local oscillators in coherent optical communication systems. Our results indicate that the spin polarization modulation with a high degree of spin polarization is important for efficient generation of strong modulation sideband. Additionally, matching the modulation frequency and polarization mode splitting in the spin-VCSEL contribute to achieve efficient and ideal single sideband generation.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"2006 1","pages":"1220509 - 1220509-6"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78640998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Einstein-Podolsky-Rosen (EPR) paradox that argues for the incompleteness of quantum mechanics as a description of physical reality has been put to rest by John Bell’s famous theorem, which inspired numerous experimental tests and brought about further affirmations of quantum reality. Nevertheless, in his writings and public presentations, Richard Feynman never acknowledged the significance of Bell’s contribution to the resolution of the EPR paradox. In this paper, we discuss several variants of the Bell inequalities (including one that was specifically espoused by Feynman), and explore the ways in which they demolish the arguments in favor of local hidden-variable theories. We also examine the roots of Feynman’s attitude toward Bell’s theorem in the context of Feynman’s special perspective on quantum mechanics.
{"title":"Spin-1 photons, spin-1/2 electrons, Bell's inequalities, and Feynman's special perspective on quantum mechanics","authors":"M. Mansuripur","doi":"10.1117/12.2633646","DOIUrl":"https://doi.org/10.1117/12.2633646","url":null,"abstract":"The Einstein-Podolsky-Rosen (EPR) paradox that argues for the incompleteness of quantum mechanics as a description of physical reality has been put to rest by John Bell’s famous theorem, which inspired numerous experimental tests and brought about further affirmations of quantum reality. Nevertheless, in his writings and public presentations, Richard Feynman never acknowledged the significance of Bell’s contribution to the resolution of the EPR paradox. In this paper, we discuss several variants of the Bell inequalities (including one that was specifically espoused by Feynman), and explore the ways in which they demolish the arguments in favor of local hidden-variable theories. We also examine the roots of Feynman’s attitude toward Bell’s theorem in the context of Feynman’s special perspective on quantum mechanics.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"17 1","pages":"122050B - 122050B-21"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90753306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An angle-insensitive metamaterial spectral filter (MS) that demonstrates great potential as a spectral disperser within hyperspectral imaging (HSI) was simulated and analyzed. The innovation of the MS is its operation on the principle of coupled resonances, whereby coupling the classical narrowband Fabry-Perot (FP) resonance and a broadband cavity mode (CM) resonance can tune its dispersive spectral behavior. This results in the MS transmitting a narrow passband within a broad stopband for a focused light cone. Compared to conventional methods, this novel approach has the potential to reduce the size, weight, and power (SWaP) of a HSI system. Currently, hyperspectral sensors require bulky dispersion controlling optics to collimate the incoming beam due to physical limitations set forth by the disperser. Because the disperser is usually a transmission/reflection grating, the angle of the incident beam significantly impacts whether the correct wavelength is incident on the sensor. At even a slightly off-normal (AoI), the beam could either miss the sensor entirely, or create cross talk between adjacent pixels. This fundamental limitation produces difficulties in managing obliquely incident light, hence the need for collimation. To get around this, the AoI insensitive metamaterial will be used in the place of the disperser and collimated optics to properly deliver obliquely incident light to the detector. When applied correctly, the MS can be used within a remote sensing detector to provide high performance spectroscopy that is similar to larger heritage sensors.
{"title":"Angle of incidence independent metamaterial for hyperspectral imaging","authors":"I. Bendoym, Lori A. Lepak, D. Crouse","doi":"10.1117/12.2632246","DOIUrl":"https://doi.org/10.1117/12.2632246","url":null,"abstract":"An angle-insensitive metamaterial spectral filter (MS) that demonstrates great potential as a spectral disperser within hyperspectral imaging (HSI) was simulated and analyzed. The innovation of the MS is its operation on the principle of coupled resonances, whereby coupling the classical narrowband Fabry-Perot (FP) resonance and a broadband cavity mode (CM) resonance can tune its dispersive spectral behavior. This results in the MS transmitting a narrow passband within a broad stopband for a focused light cone. Compared to conventional methods, this novel approach has the potential to reduce the size, weight, and power (SWaP) of a HSI system. Currently, hyperspectral sensors require bulky dispersion controlling optics to collimate the incoming beam due to physical limitations set forth by the disperser. Because the disperser is usually a transmission/reflection grating, the angle of the incident beam significantly impacts whether the correct wavelength is incident on the sensor. At even a slightly off-normal (AoI), the beam could either miss the sensor entirely, or create cross talk between adjacent pixels. This fundamental limitation produces difficulties in managing obliquely incident light, hence the need for collimation. To get around this, the AoI insensitive metamaterial will be used in the place of the disperser and collimated optics to properly deliver obliquely incident light to the detector. When applied correctly, the MS can be used within a remote sensing detector to provide high performance spectroscopy that is similar to larger heritage sensors.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"551 1","pages":"121950D - 121950D-6"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90780415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Winston T. Goldthwaite, Roshell Lamug, J. V. Van Schenck, Richard Puro, J. Anthony, O. Ostroverkhova
We present a study of photodegradation in functionalized anthraditiophene (diF TES-ADT)-based films in hybrid cavities composed of distributed Bragg reflector (DBR) bottom mirror and top silver (Ag) mirror, depending on two different DBR reflectivity stopbands. The concentration of diF TES-ADT was chosen such that the films contain molecules in “amorphous” and “aggregate” phases characterized by different optical absorption spectra. We demonstrate that the cavity photon preferentially couples to the molecules in the “amorphous” phase and observe different photodegradation, attributed to photodimerization, dynamics for cavity photon-coupled and uncoupled states. The presence of the longer lived emissive states, such as entangled triplet pair (TT) states formed in the process of singlet fission, was correlated with a faster photodimerization dynamics. The observed cavity-dependent photodimerization dynamics offers an opportunity to manipulate the reaction rates and yield with cavity characteristics.
{"title":"Photophysics and photochemistry of functionalized anthradithiophene in microcavities","authors":"Winston T. Goldthwaite, Roshell Lamug, J. V. Van Schenck, Richard Puro, J. Anthony, O. Ostroverkhova","doi":"10.1117/12.2632388","DOIUrl":"https://doi.org/10.1117/12.2632388","url":null,"abstract":"We present a study of photodegradation in functionalized anthraditiophene (diF TES-ADT)-based films in hybrid cavities composed of distributed Bragg reflector (DBR) bottom mirror and top silver (Ag) mirror, depending on two different DBR reflectivity stopbands. The concentration of diF TES-ADT was chosen such that the films contain molecules in “amorphous” and “aggregate” phases characterized by different optical absorption spectra. We demonstrate that the cavity photon preferentially couples to the molecules in the “amorphous” phase and observe different photodegradation, attributed to photodimerization, dynamics for cavity photon-coupled and uncoupled states. The presence of the longer lived emissive states, such as entangled triplet pair (TT) states formed in the process of singlet fission, was correlated with a faster photodimerization dynamics. The observed cavity-dependent photodimerization dynamics offers an opportunity to manipulate the reaction rates and yield with cavity characteristics.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"53 1","pages":"1219903 - 1219903-11"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90810685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Elise Bailly, Camilo Perez de la Vega, K. Chevrier, Y. De Wilde, V. Krachmalnicoff, J. Hugonin, B. Vest, J. Greffet
Light emitted by fluorophores can be computed from the knowledge of the absorption spectrum. However, at long wavelengths, the calculated emission may diverge if the decay of the imaginary part of the permittivity is not modelled accurately. We report a technique to obtain the permittivity of fluorophores such as dye molecules from fluorescence measurements. We find that the Brendel-Bormann model enables to fit the emission spectra accurately.
{"title":"Quantitative modelling of photoluminescence from light-emitting metasurfaces via absorption calculations","authors":"Elise Bailly, Camilo Perez de la Vega, K. Chevrier, Y. De Wilde, V. Krachmalnicoff, J. Hugonin, B. Vest, J. Greffet","doi":"10.1117/12.2633275","DOIUrl":"https://doi.org/10.1117/12.2633275","url":null,"abstract":"Light emitted by fluorophores can be computed from the knowledge of the absorption spectrum. However, at long wavelengths, the calculated emission may diverge if the decay of the imaginary part of the permittivity is not modelled accurately. We report a technique to obtain the permittivity of fluorophores such as dye molecules from fluorescence measurements. We find that the Brendel-Bormann model enables to fit the emission spectra accurately.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"50 1","pages":"1219506 - 1219506-7"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88651464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rodolfo A. Carrillo-Betancourt, J. Hernández-Cordero
Tryptophan fluorescence offers a means for tracking cellular proliferation in events such as wounds closure, neoplasm and others chronic conditions. The peak fluorescence emission is located around 345 nm (UV range) and is typically analyzed through spectroscopic measurements. In general, optical fibers show poor transmission in this wavelength range, and this hinders the use of this waveguides for tryptophan fluorescence monitoring or other molecule with UV fluorescence. However, down conversion phosphors attached to conventional fiber tips may provide a mechanism for improved fluorescence detection in this spectral range. In this work, we explore the use of UV-sensitive phosphors hosted by a polymer matrix that can be incorporated on the tip of conventional optical fibers for UV-fluorescence monitoring. In particular, we evaluate the performance of Eu-activated phosphors absorbing at 345 nm and emitting multiple fluorescence peaks in the 450-650 nm range. The phosphors are incorporated in polydimethylsiloxane (PDMS) by a simple mixing procedure, yielding a UV-sensitive polymer composite. Membranes of this composited were fabricated using different concentrations of the phosphors (i.e. 0.1, 0.5, 2.5, 12.5 and 62.5% wt./wt.), and their optical and thermal properties were evaluated. The polymer composites show good thermal stability and can be incorporated on conventional optical fibers. The resulting fiber optic fluorosensors may serve as a tool for fluorescence monitoring of tryptophan or other UV emitters.
{"title":"Polymer coatings with rare-earth activated phosphors for optical fiber fluorosensors","authors":"Rodolfo A. Carrillo-Betancourt, J. Hernández-Cordero","doi":"10.1117/12.2633180","DOIUrl":"https://doi.org/10.1117/12.2633180","url":null,"abstract":"Tryptophan fluorescence offers a means for tracking cellular proliferation in events such as wounds closure, neoplasm and others chronic conditions. The peak fluorescence emission is located around 345 nm (UV range) and is typically analyzed through spectroscopic measurements. In general, optical fibers show poor transmission in this wavelength range, and this hinders the use of this waveguides for tryptophan fluorescence monitoring or other molecule with UV fluorescence. However, down conversion phosphors attached to conventional fiber tips may provide a mechanism for improved fluorescence detection in this spectral range. In this work, we explore the use of UV-sensitive phosphors hosted by a polymer matrix that can be incorporated on the tip of conventional optical fibers for UV-fluorescence monitoring. In particular, we evaluate the performance of Eu-activated phosphors absorbing at 345 nm and emitting multiple fluorescence peaks in the 450-650 nm range. The phosphors are incorporated in polydimethylsiloxane (PDMS) by a simple mixing procedure, yielding a UV-sensitive polymer composite. Membranes of this composited were fabricated using different concentrations of the phosphors (i.e. 0.1, 0.5, 2.5, 12.5 and 62.5% wt./wt.), and their optical and thermal properties were evaluated. The polymer composites show good thermal stability and can be incorporated on conventional optical fibers. The resulting fiber optic fluorosensors may serve as a tool for fluorescence monitoring of tryptophan or other UV emitters.","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"4 1","pages":"122020B - 122020B-9"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89002187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
James H. Cullen, Rhonald Burgos Atencia, D. Culcer
The role of topological insulator (TI) bulk states in the the enormous spin torques recorded at TI/ferromagnet (FM) interfaces is poorly understood. Here we study spin torques due to TI bulk states focusing on magnetized TIs. We find that there is a novel spin transfer torque on an inhomogeneous magnetization, it is small in our idealized
{"title":"Current-induced spin polarizations in the bulk of topological insulators with inhomogeneous magnetic textures","authors":"James H. Cullen, Rhonald Burgos Atencia, D. Culcer","doi":"10.1117/12.2635768","DOIUrl":"https://doi.org/10.1117/12.2635768","url":null,"abstract":"The role of topological insulator (TI) bulk states in the the enormous spin torques recorded at TI/ferromagnet (FM) interfaces is poorly understood. Here we study spin torques due to TI bulk states focusing on magnetized TIs. We find that there is a novel spin transfer torque on an inhomogeneous magnetization, it is small in our idealized","PeriodicalId":13820,"journal":{"name":"International Conference on Nanoscience, Engineering and Technology (ICONSET 2011)","volume":"11 1 1","pages":"1220503 - 1220503-10"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90164234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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