Results 31 to 40 of about 1,363,250 (192)
Dispersive properties of quasi-phase-matched optical parametric amplifiers [PDF]
, 2002 The dispersive properties of non-degenerate optical parametric amplification in quasi-phase-matched (QPM) nonlinear quadratic crystals with an arbitrary grating profile are theoretically investigated in the no-pump-depletion limit.
A. Dogariu +39 more
core +2 more sources
Design, Modeling and Synthesis of Negative Group Delay IL-Shape Topology
IEEE Access, 2019 This paper introduces a negative group delay (NGD) theory of passive topology presenting “IL”-shape geometry. The two-port topology is comprised of a coupled line with an open- and stub-loaded terminations.
Blaise Ravelo +3 more
doaj +1 more source
Miniaturized Microstrip Diplexer Based on FR4 Substrate for Wireless Communications
Elektronika ir Elektrotechnika, 2021 In this paper, the miniaturized microstrip diplexer has been designed for dual channels based on FR4 substrate material. It consists of two bandpass filters (BPFs) functioning under dissimilar frequency bands coupled with a unified junction.
Hussein Ali Hussein +2 more
doaj +1 more source
Negative group delay for Dirac particles traveling through a potential well
, 2003 The properties of group delay for Dirac particles traveling through a potential well are investigated. A necessary condition is put forward for the group delay to be negative. It is shown that this negative group delay is closely related to its anomalous
A. Enders +29 more
core +1 more source
Phase tunability of group velocity by modulated-pump-forced coherent population oscillations [PDF]
, 2009 We propose a technique to obtain slow and fast light propagations based on coherent population oscillations forced by a modulated pump. This mechanism produces an enhancement of 1 order of magnitude of the delay or advancement of light signals.
Antón Revilla, Miguel Ángel +4 more
core +2 more sources
All-Pass Negative Group Delay Function With Transmission Line Feedback Topology
IEEE Access, 2019 A novel circuit theory of all-pass Negative group delay (NGD) function is investigated. The NGD function is implemented with unity direct chain feedback (UDCF) system.
Blaise Ravelo, Fayu Wan, Jiao Feng
doaj +1 more source
International Journal of Antennas and Propagation, 2021 A band-stop filter with three different negative group delay functions in the passband, namely, band pass, high pass and low pass, is proposed, which has small insertion loss. The capacitance, inductance, and resistance meet different conditions, and the
Aixia Yuan +4 more
doaj +1 more source
Superluminal pulse reflection from a weakly absorbing dielectric slab
, 2006 Group delay for a reflected light pulse from a weakly absorbing dielectric slab is theoretically investigated, and large negative group delay is found for weak absorption near a resonance of the slab ($Re(kd)=m\pi$).
Blaauboer +23 more
core +1 more source
Realization of Negative Group Delay Network Using Defected Microstrip Structure
International Journal of Antennas and Propagation, 2014 A design of negative group delay (NGD) networks using a U-shaped defected microstrip structure (DMS) and lumped elements is presented in this paper. The signal attenuation characteristics of DMS were utilized to get NGD time.
Girdhari Chaudhary +2 more
doaj +1 more source
Superluminal Pulse Propagation in a One-sided Nanomechanical Cavity System
, 2013 We investigate the propagation of a pulse field in an optomechanical system. We examine the question of advance of the pulse under the conditions of electromagnetically induced transparency in the mechanical system contained in a high quality cavity.
Tarhan, Devrim
core +1 more source