According to the resonance transition between propagating surface plasmon and localized surface plasmon, we demonstrate a design of beam splitter that can split terahertz wave beams in a relatively broad frequency ran...According to the resonance transition between propagating surface plasmon and localized surface plasmon, we demonstrate a design of beam splitter that can split terahertz wave beams in a relatively broad frequency range. The transmission properties of the beam splitter are analyzed utilizing the finite element method. The resonance transition between two kinds of plasmons can be explained by a model of coherent electron cloud displacement.展开更多
We propose an improved design and numerical study of an optimized tunable plasmonics artificial material resonator in the terahertz regime. We demonstrate that tunability can be realized with a transmission intensity ...We propose an improved design and numerical study of an optimized tunable plasmonics artificial material resonator in the terahertz regime. We demonstrate that tunability can be realized with a transmission intensity as much as - 61% in the lower frequency resonance, which is implemented through the effect of photoconductive switching under photoexcitation.In the higher frequency resonance, we show that spoof surface plasmons along the interface of metal/dielectric provide new types of electromagnetic resonances. Our approach opens up possibilities for the interface of metamaterial and plasmonics to be applied to optically tunable THz switching.展开更多
We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride(NbN) film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity o...We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride(NbN) film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity of extraordinary terahertz transmission peaks can be greatly modified by the transition of NbN film from the normal state to the superconducting state. An enhancement of the(±1, 0) NbN/magnesium oxide(MgO) peak intensity as high as 200% is demonstrated due to the combined contribution of both the superconducting transition and the excitation of localized surface plasmons(LSPs) around the apertures. The extraordinary terahertz transmission through spindle-like hole arrays patterned on the NbN film can pave the way for us to explore novel active tuning devices.展开更多
Inexpe nsive copper nano particles are generally thought to possess weak and broad localized surface plasm on resonance(LSPR).The,present experimental and theoretical studies show that tailoring the Cu nanoparticle to...Inexpe nsive copper nano particles are generally thought to possess weak and broad localized surface plasm on resonance(LSPR).The,present experimental and theoretical studies show that tailoring the Cu nanoparticle to a cubic shape results in a single intense,narrow,and asymmetric LSPR line shape,which is even superior to round-shaped gold nanoparticles.In this study,the dielectric function of copper is decomposed into an interband transition component and a free-electron component.This allows interband transition-induced plasmon damping to be visualized both spectrally and by surface polarization charges.The results reveal that the LSPR of Cu nanocubes originates from the comer mode as it is spectrally separated from the interb and transitions.In additi on,the interband tran sitions lead to severe damping of the local electromagnetic field but the cubic corner LSPR mode survives.Cu nanocubes display an extinction coefficient comparable to the dipole mode of a gold nanosphere with the same volume and show a larger local electromagnetic field enhancement These results will guider-development of in expensive plasmonic copper-based nano materials.展开更多
Metamaterial devices(metadevices)have been developed in progress aiming to generate extraordinary performance over traditional de-vices in the(sub-)terahertz(THz)domain,and their planar integra-tion with complementary...Metamaterial devices(metadevices)have been developed in progress aiming to generate extraordinary performance over traditional de-vices in the(sub-)terahertz(THz)domain,and their planar integra-tion with complementary-metal-oxide-semiconductor(CMOS)cir-cuits pave a new way to build miniature silicon plasmonics that over-comes existing challenges in chip-to-chip communication.In an effort towards low-power,crosstalk-tolerance,and high-speed data link for future exascale data centers,this article reviews the recent progress on two metamaterials,namely,the spoof surface plasmon polaritons(SPPs),and the split-ring resonator(SRR),as well as their imple-mentations in silicon,focusing primarily on their fundamental the-ories,design methods,and implementations for future THz commu-nications.Owing to their respective dispersion characteristic at THz,these two metadevices are highly expected to play an important role in miniature integrated circuits and systems toward compact size,dense integration,and outstanding performance.A design example of a fully integrated sub-THz CMOS silicon plasmonic system integrating these two metadevices is provided to demonstrate a dual-channel crosstalk-tolerance and energy-efficient on-off keying(OOK)communication system.Future directions and potential applications for THz metade-vices are discussed.展开更多
We design a four-band terahertz metamaterial absorber that relied on the block Dirac semi-metal(BDS).It is composed of a Dirac material layer,a gold reflecting layer,and a photonic crystal slab(PCS)medium layer.This s...We design a four-band terahertz metamaterial absorber that relied on the block Dirac semi-metal(BDS).It is composed of a Dirac material layer,a gold reflecting layer,and a photonic crystal slab(PCS)medium layer.This structure achieved perfect absorption of over 97%at 4.06 THz,6.15 THz,and 8.16 THz.The high absorption can be explained by the localized surface plasmon resonance(LSPR).And this conclusion can be proved by the detailed design of the surface structure.Moreover,the resonant frequency of the device can be dynamically tuned by changing the Fermi energy of the BDS.Due to the advantages such as high absorption,adjustable resonance,and anti-interference of incident angle and polarization mode,the Dirac semi-metal perfect absorber(DSPA)has great potential value in fields such as biochemical sensing,information communication,and nondestructive detection.展开更多
文摘According to the resonance transition between propagating surface plasmon and localized surface plasmon, we demonstrate a design of beam splitter that can split terahertz wave beams in a relatively broad frequency range. The transmission properties of the beam splitter are analyzed utilizing the finite element method. The resonance transition between two kinds of plasmons can be explained by a model of coherent electron cloud displacement.
基金Project supported by the National Natural Science Foundation of China(Grant No.61201075)the Natural Science Foundation of Heilongjiang Province+5 种基金China(Grant No.F2015039)the Young Scholar Project of Heilongjiang Provincial Education BureauChina(Grant No.1254G021)the China Postdoctoral Science Foundation(Grant No.2012M511507)the Science Funds for the Young Innovative Talents of Harbin University of Science and TechnologyChina(Grant No.201302)
文摘We propose an improved design and numerical study of an optimized tunable plasmonics artificial material resonator in the terahertz regime. We demonstrate that tunability can be realized with a transmission intensity as much as - 61% in the lower frequency resonance, which is implemented through the effect of photoconductive switching under photoexcitation.In the higher frequency resonance, we show that spoof surface plasmons along the interface of metal/dielectric provide new types of electromagnetic resonances. Our approach opens up possibilities for the interface of metamaterial and plasmonics to be applied to optically tunable THz switching.
基金Project supported by the National Basic Research Program of China （Grant Nos. 2011CBA00110 and 2011CBA00107） and the National Natural Science Foundation of China.
文摘We studied numerically the temperature dependent extraordinary terahertz transmission through niobium nitride(NbN) film perforated with subwavelength spindle-like apertures. Both the resonant frequency and intensity of extraordinary terahertz transmission peaks can be greatly modified by the transition of NbN film from the normal state to the superconducting state. An enhancement of the(±1, 0) NbN/magnesium oxide(MgO) peak intensity as high as 200% is demonstrated due to the combined contribution of both the superconducting transition and the excitation of localized surface plasmons(LSPs) around the apertures. The extraordinary terahertz transmission through spindle-like hole arrays patterned on the NbN film can pave the way for us to explore novel active tuning devices.
文摘Inexpe nsive copper nano particles are generally thought to possess weak and broad localized surface plasm on resonance(LSPR).The,present experimental and theoretical studies show that tailoring the Cu nanoparticle to a cubic shape results in a single intense,narrow,and asymmetric LSPR line shape,which is even superior to round-shaped gold nanoparticles.In this study,the dielectric function of copper is decomposed into an interband transition component and a free-electron component.This allows interband transition-induced plasmon damping to be visualized both spectrally and by surface polarization charges.The results reveal that the LSPR of Cu nanocubes originates from the comer mode as it is spectrally separated from the interb and transitions.In additi on,the interband tran sitions lead to severe damping of the local electromagnetic field but the cubic corner LSPR mode survives.Cu nanocubes display an extinction coefficient comparable to the dipole mode of a gold nanosphere with the same volume and show a larger local electromagnetic field enhancement These results will guider-development of in expensive plasmonic copper-based nano materials.
基金supported by National Natural Science Founda-tion of China(NSFC)(Key Program Grant No.62034007)the Key-Area Research and Development Program of Guangdong Province(Grant No.2019B010116002)+3 种基金Guangdong Basic and Applied Basic Research Founda-tion(Grant 2019B1515120024)Shenzhen Science and Technology Program(Grant No.KQTD20200820113051096)supported by Na-tional Natural Science Foundation of China under Grant 62101122Natural Science Foundation of Jiangsu Province under Grant BK20210212.
文摘Metamaterial devices(metadevices)have been developed in progress aiming to generate extraordinary performance over traditional de-vices in the(sub-)terahertz(THz)domain,and their planar integra-tion with complementary-metal-oxide-semiconductor(CMOS)cir-cuits pave a new way to build miniature silicon plasmonics that over-comes existing challenges in chip-to-chip communication.In an effort towards low-power,crosstalk-tolerance,and high-speed data link for future exascale data centers,this article reviews the recent progress on two metamaterials,namely,the spoof surface plasmon polaritons(SPPs),and the split-ring resonator(SRR),as well as their imple-mentations in silicon,focusing primarily on their fundamental the-ories,design methods,and implementations for future THz commu-nications.Owing to their respective dispersion characteristic at THz,these two metadevices are highly expected to play an important role in miniature integrated circuits and systems toward compact size,dense integration,and outstanding performance.A design example of a fully integrated sub-THz CMOS silicon plasmonic system integrating these two metadevices is provided to demonstrate a dual-channel crosstalk-tolerance and energy-efficient on-off keying(OOK)communication system.Future directions and potential applications for THz metade-vices are discussed.
基金The National Natural Science Foundation of China(Nos.62171406,11961141010,61975176)the Key Research and Development Program of the Ministry of Science and Technology(Nos.2022YFA1404902,2022YFA1404704,2022YFA1405200)+2 种基金the Zhejiang Provincial Natural Science Foundation(No.Z20F010018)the Key Research and Development Program of Zhejiang Province(No.2022C01036)the Fundamental Research Funds for the Central Universities。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11604311,61705204,and 21506257)the Scientific Research Fund from Sichuan Provincial Science and Technology Department(Grant Nos.2020YJ0137 and 2020YFG0467)+2 种基金the Undergraduate Innovation Fund by Southwest University of Science and Technology(Grant No.JZ20-027)the Fund by the School of Science of Southwest University of Science and Technology for the Innovation Fund Project(Grant No.LX2020010)the Undergraduate Innovation and Entrepreneurship Training Program of Southwest University of Science and Technology(Grant No.S202010619073).
文摘We design a four-band terahertz metamaterial absorber that relied on the block Dirac semi-metal(BDS).It is composed of a Dirac material layer,a gold reflecting layer,and a photonic crystal slab(PCS)medium layer.This structure achieved perfect absorption of over 97%at 4.06 THz,6.15 THz,and 8.16 THz.The high absorption can be explained by the localized surface plasmon resonance(LSPR).And this conclusion can be proved by the detailed design of the surface structure.Moreover,the resonant frequency of the device can be dynamically tuned by changing the Fermi energy of the BDS.Due to the advantages such as high absorption,adjustable resonance,and anti-interference of incident angle and polarization mode,the Dirac semi-metal perfect absorber(DSPA)has great potential value in fields such as biochemical sensing,information communication,and nondestructive detection.
