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Strong influence of packing density in terahertz metamaterials
(AIP Publishing, 2010-12-16)
We investigate the response of a terahertz metamaterial depending on the unit cell density. The fundamental inductive capacitive (LC) resonance has its highest quality (Q) factor for a critical period Pc=lambda/n, with ...
Cryogenic temperatures as a path toward high-Q terahertz metamaterials
(AIP Publishing, 2010-02-19)
Optical properties of planar thin film metamaterials were measured at room and liquid nitrogen temperatures using terahertz time-domain spectroscopy. The operation of metamaterials at cryogenic temperatures is anticipated ...
New near-analytical path to the threshold size of spherical random lasing via geometric-distribution-probability weighting of the diffusive photon fluence rate
(ArXiv, 2022-08-15)
We demonstrate a new near-analytical path to the threshold-size of random-lasing for the case of a uniform and isotropic-scattering sphere. We assess a geometric-distribution-probability (GDP) weighted integration of the ...
Behavior of electron-spin echoes and photon echoes in high fields
(American Physical Society, 1970-07-01)
The amplitude of the electron-spin or photon echo from an ensemble of isolated atoms (echo atoms) interacting with magnetic-nuclear neighbors is calculated as a function of the magnitude and the orientation of an applied ...
Microsphere whispering-gallery-mode laser using HgTe quantum dots
(AIP Publishing, 2004-12-20)
Ultralow-threshold continuous-wave lasing is achieved at room temperature in a fused-silica microsphere that is coated with HgTe quantum dots (colloidal nanoparticles). The 830nm pump input and HgTe microlaser output are ...
Ultrasensitive terahertz sensing with high-Q Fano resonances in metasurfaces
(AIP Publishing, 2014-10-27)
High quality factor resonances are extremely promising for designing ultra-sensitive refractive index label-free sensors, since it allows intense interaction between electromagnetic waves and the analyte material. Metamaterial ...
Probing the transition from an uncoupled to a strong near-field coupled regime between bright and dark mode resonators in metasurfaces
(AIP Publishing, 2014-08-27)
The coupling of multiple plasmonic resonators that sustain bright or dark modes provide intriguing spectral signatures. However, probing the onset of coupling effects while engaging the resonators with an increasing proximity ...