Direct observation of Anderson localization in plasmonic terahertz devices

Pandey, Shashank; Gupta, Barun; Mujumdar, Sushil; Nahata, Ajay

doi:10.1038/lsa.2016.232

Cited by 28 publications

(25 citation statements)

References 28 publications

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“…Under such conditions, mode 1 will be preferentially detected, providing a clean measurement of an isolated Anderson localized mode beyond the Bragg frequency. Such a clean isolated mode was indeed observed in the experiments outside the Bragg cutoff [20]. The localization length for this mode is calculated to be 1.8 mm.…”

Section: Dissipation and Localizationsupporting

confidence: 66%

“…1(d) shows their intensity distribu-tion in the unit cell, computed at the yz plane at the center of a hole. Penetration of the terahertz intensity in the higher order bands (iv, not shown here) in air is extremely weak, and hence, these bands escape experimental detection methods that rely on index modulation of electro-optic crystals [20].…”

Section: Physical Structurementioning

confidence: 92%

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Anderson localization at the hybridization gap in a plasmonic system

2018

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Disorder-induced Anderson localization in quasiparticle transport is a challenging problem to address, even more so in the presence of dissipation as the symptoms of disorder-induced localization are very closely simulated by the absorption in a system. Following up on recent experimental studies, we numerically study the occurrence of Anderson localization in plasmonic systems at terahertz frequencies. The low losses in the material at these frequencies allow us to separately quantify the localization length and the loss length in the system. We measure a non-monotonic variation of loss length as a function of disorder, and attribute it to the participation ratio of the localized modes and resulting light occupancy in the metal. Next, we identify a unique behavior of the gap state frequencies and the density of states under disorder. We observe that the maximally displaced gap state frequencies have a propensity to remain pinned to the frequency of the gap center. Even under strong disorder, the gap does not close, and density of states profile continues to remain peaked in the gap, unlike in conventionally studied disordered systems. The origins of this behavior are traced to the nature of the quasiparticle dispersion. In our case, the quasiparticles are identified to be hybrid plasmons generated due to the hybridization of surface plasmon polaritons at a metal-dielectric interface and cavity resonances at sub-wavelength apertures thereon. This situation is akin to the Kondo systems, where dispersive conduction electrons hybridise with a localized impurity state opening a hybridization gap. Our results provide new insights on the elusive problem of the interplay of loss and localization, and underlines interesting physics at the hybridisation gap in hybrid plasmonic systems.

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Section: Dissipation and Localizationsupporting

confidence: 66%

Section: Physical Structurementioning

confidence: 92%

Anderson localization at the hybridization gap in a plasmonic system

2018

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“…In such a configuration, by scanning the femtosecond spot position, the cross section of the THz SPW field distribution can be mapped; by scanning the position of the crystal along the propagation direction, the THz SPW field along the propagation plane can be mapped; and by controlling the crystal orientation and polarization of the probe femtosecond beam, each polarization component of the THz SPWs can be detected. Pandey et al 114 utilized a ZnTe crystal as the detector to measure the THz SSPPs above a waveguide consisting of a one-dimensional (1-D) array of rectangular aperture on a free-standing metal foil. Gacemi et al 115 used ZnTe to measure the THz SPWs on a PGL.…”

Section: Direct Detection Of Thz Spwsmentioning

confidence: 99%

Terahertz surface plasmonic waves: a review

et al. 2020

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Terahertz science and technology promise many cutting-edge applications. Terahertz surface plasmonic waves that propagate at metal-dielectric interfaces deliver a potentially effective way to realize integrated terahertz devices and systems. Previous concerns regarding terahertz surface plasmonic waves have been based on their highly delocalized feature. However, recent advances in plasmonics indicate that the confinement of terahertz surface plasmonic waves, as well as their propagating behaviors, can be engineered by designing the surface environments, shapes, structures, materials, etc., enabling a unique and fascinating regime of plasmonic waves. Together with the essential spectral property of terahertz radiation, as well as the increasingly developed materials, microfabrication, and time-domain spectroscopy technologies, devices and systems based on terahertz surface plasmonic waves may pave the way toward highly integrated platforms for multifunctional operation, implementation, and processing of terahertz waves in both fundamental science and practical applications. We present a review on terahertz surface plasmonic waves on various types of supports in a sequence of properties, excitation and detection, and applications. The current research trend and outlook of possible research directions for terahertz surface plasmonic waves are also outlined.

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“…As the optical modes in THz QCL cavity are essentially SPP modes and the index contrast of disordered gratings is much higher than that in Ref. [164], principally it is easier to realize the localization of light in our devices.…”

Section: Indirect Proof For the Localization Of Lightmentioning

confidence: 85%

“…I don't have the access to low temperature NSOM system in our group, thus a simpler method is proposed to further verify the localization of light. Recently, the strong localization of THz surface plasmon polariton (SPP) wave on a copper foil with disordered gratings was observed [164]. However, this is a passive structure.…”

Section: Indirect Proof For the Localization Of Lightmentioning

confidence: 99%

Terahertz quantum cascade lasing in disordered photonic systems

Zeng¹

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At first, I would like to take this opportunity to express my sincere gratitude to my supervisor-Prof. Qi Jie WANG. He always shares his experiences with me, shows me the correct direction and the most efficient way to do research. He is also willing to share his ideas and life experiences that are both beneficial to my current research and future career. He would not hesitate in pointing out my weaknesses and is always encouraging in helping me to overcome them. His passion inspires me. His enthusiasm in science has made my past four years an unforgettable memory in my life. I would also like to thank my co-supervisor Dr. Ying ZHANG, and Dr. Houkun LIANG at Singapore Institute of Manufacturing Technology. Dr. ZHANG shares a lot of his experiences with me and gives me many valuable suggestions for my research work. I still remember the long list of valuable comments he made for my QE presentation slides, without omitting even the smallest issue. I was touched by his working attitude and have since made it my own guideline of research. Dr. LIANG also helps and encourages me a lot. His optimism, persistence, and enthusiasm for research always give me great impetus. Additionally, I would like to thank Dr. Yanyan ZHOU for her enlightening sharing and discussions.

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Direct observation of Anderson localization in plasmonic terahertz devices

Cited by 28 publications

References 28 publications

Anderson localization at the hybridization gap in a plasmonic system

Anderson localization at the hybridization gap in a plasmonic system

Terahertz surface plasmonic waves: a review

Terahertz quantum cascade lasing in disordered photonic systems

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