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Switching waves (SWs) are fronts that connect two homogeneous stable states of a multistable system [1]. An isolated SW typically propagates until the most stable state completely invades the other and can only be stationary at the so-called Maxwell point, where the two states have the same marginal stability. Close to the Maxwell point, it may still be possible however for two SWs to form a stable...
A high-speed quasi-distributed fiber optic sensing technique is proposed. A sensing link consisting multiple identical fiber Bragg gratings (FBGs) was interrogated by a pulsed light source, and a dispersive unit at the receiver end was used to convert the wavelength shifts of the reflected pulses into time-delay changes. This Bragg wavelength-dependent time delay can be accurately calculated by a...
With a narrow peak on top of a broad-band gain profile in a laser, the group-velocity of light becomes significantly subluminal. The lasing frequency becomes extremely insensitive to cavity length change in such a laser.
We show how a dual-peak gain produced via optical pumping and non-degenerate Raman pumps in a single vapor cell can be used to realize a superluminal ring laser with enhanced sensitivity for gyroscopy and accelerometry.
This paper reports a polymer nano-composite with enhanced electro-mechanical performance by mixing TiO2 nano-particles into polydimethylsiloxane (PDMS) matrix. The nano-composites with TiO2 concentration up to 30 wt% were synthesized by in-situ polymerization. High energy ball milling and surfactant polyethylene glycol was used to reduce the agglomeration and ensure a stable dispersion. The properties...
We show that group velocity of light far exceeding the vacuum speed can be realized when a medium that produces a narrow band dip in the gain profile is placed inside a ring laser. The dip leads to an effective negative dispersion, which can be tuned to produce a very small group index. The rotational sensitivity of the ring laser is enhanced by a factor equaling the inverse of the group index. For...
We have experimentally investigated dual-layer fishnet structures in the terahertz regime. The dispersion behavior of the different modes in this structure is inferred from their response to changes in THz wave incident angle and the thickness of the dielectric layer separating the two metallic films. The theory of magnetic plasmon polariton (MPP) is applied to explain the coupled dispersive modes.
This paper compares device performance for In0.53Ga0.47As MOSFETs using single HfO2 gate dielectric with stacked gate dielectrics using various interfacial layers between HfO2 and In0.53Ga0.47As substrate including Al2O3, HfAlOx, LaAlOx, and LaHfOx. Of the gate stacks studied, Al2O3/HfO2, HfAlOx/HfO2, and LaAlOx/HfO2 bilayer gate dielectrics exhibit lower subthreshold swing, higher drive current and...
A low loss sharp bend is proposed and analyzed in the slow-light waveguide which is consisted of a series of silicon nanopillars. More than 90% of transmission over 100 nm bandwidth is obtained.
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