Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 36 for “"nonreciprocal"”.
-
Nonreciprocal phenomena in superconductivity
… field. The first example that we discuss is nonreciprocal superconductivity, which occurs upon simultaneous breaking of inversion and time-reversal symmetries. Nonreciprocal superconductors describe certain classes of unconventional superconductors that include certain kinds of mixed-pairing …
-
Nonreciprocal coupling to microstrip resonators
"Inducing nonreciprocal wave propagation is a fundamental challenge across a wide range of physical systems in electromagnetics, optics, and acoustics. Linear, time-invariant systems are always reciprocal, but reciprocity can be broken through the action of a bias that is asymmetric under …
-
Nonreciprocal microwave devices using parametric frequency conversion
… endeavors to characterize the performance of nonreciprocal microwave devices enabled by parametric frequency conversion. Although such devices have been explored somewhat superficially in the 1960s, resurgent interest in low-noise nonreciprocal components has motivated new research in …
-
Nonreciprocal effects and their applications in fiber optic networks
… integrated lightwave circuits. Several common nonreciprocal optical effects studied in this disseration and several basic applications to fiber components and fiber optic metrology systems analyzed. The common optical nonreciprocal phenomena include the Faraday effect, Sagnac effect, Fresnel …
-
Magneto-optical oxide thin films and integrated nonreciprocal photonic devices
Nonreciprocal photonic devices including optical isolators and optical circulators are indispensible components in present day optical communication systems. Although highly desired by the fast development of silicon photonics, monolithically integrating such devices on a semiconductor platform has …
-
Nonreciprocal and Exotic Radiative Transfer in Type-I Magnetic Weyl Semimetals
… violate Kirchhoff’s law of radiation, and that nonreciprocal surface plasmon polaritons (SPPs) excited on this interface drive the nonreciprocity in the radiative heat transfer. In addition, we propose a physical mechanism for the nonreciprocity in terms of the forces felt by electrons as a …
-
Classifying Polynomials With Reducible Nonreciprocal Parts and the Factorization of Values of Polynomials
<p>Let f(x) be a polynomial with integer coefficients. If either f(x) = xdegff(1/x) or f(x) = -xdegff(1/x), then f(x) is called reciprocal. We refer to the non-reciprocal part of f(x) as the polynomial f(x) removed of its irreducible reciprocal factors. In 1970, Schinzel proved that for a given …
-
Magneto-optical and multiferroic oxide thin films, integrated nonreciprocal photonic devices and multiferroic memory devices
Complex oxide thin films offer unique functionalities which can potentially extend the utility of current storage, processing and optical isolator technologies. In this thesis, we present three categories of studies on complex oxide growth using pulsed laser deposition (PLD) and structural, …
-
Breaking symmetries in ordered materials : spin polarized light transport in magnetized noncentrosymmetric 1D photonic crystals, and photonic gaps and fabrication of quasiperiodic structured materials from interference lithography
… time-reversal symmetries were shown to display nonreciprocal dispersion relations, and to exhibit a remarkable set of symmetry-related properties. Even in 1D, these materials are found to display indirect photonic band gaps, backward wave propagating modes (antiparallel phase and group …
-
Evaluation of on-chip integration of magneto-optic isolators
… of structural designs for waveguide isolator (nonreciprocal mode conversion and nonreciprocal phase shift) have both merits and short comings for integration. The advances in integration techniques and materials related developments in the last decade are a big step towards monolithic …
-
Dynamic Metasurfaces for Advanced Applications
… modulation, enabling a new class of nonreciprocal reflectarrays. Finally we present a general, algorithmic optimization that brings our nonreciprocal metasurface to application-relevant efficiencies. </p>
-
Wave transport in parity-time symmetric, time-varying, and quasi-periodic systems
… parameters and synchronization in a series of nonreciprocal devices based on synchronized loss modulation. The research showed that the nonreciprocal response of these systems experiences a linear regression of insertion loss and isolation with respect to the timing error among switches. …
-
Depressed Children's Friendships
… another as one of their top three friends) and ""nonreciprocal friendships"" (i.e., the target child selected the partner as one of their top three friends, but the partner did not reciprocate). Children's self-reports, teacher's reports, and observations of the game-playing interactions were …
-
Nonlinear and Time-Modulated Metamaterials: Applications at Microwave Frequencies
… engineering community, including the creation of nonreciprocal devices, frequency conversion, and more. In this dissertation, we explore, investigate, design, and fabricate metamaterials that open new applications for nonlinearity-based and time-varying devices, particularly in the context of …
-
Genetic algorithm gradient ascent (GAGA) optimization of compact symmetry-breaking photonic crystals
… designs. Two different mechanisms to enable nonreciprocal infrared absorbers/emitters are simulated and compared – anomalous Hall effect in Weyl semimetals 2 and electric-current-induced Fizeau drag in either Dirac or Weyl semimetals3 . To engineer an ultra-compact absorber structure that …
-
Optimizing the stroke of Purcell's rotator, a low Reynolds number swimmer
… itself by moving these links in a repetitive, nonreciprocal stroke motion. Using a mathematical model of the swimmer, two strokes were found, one which optimizes its rotation of the swimmer and one which optimizes its translation.
-
Periodic driving and nonreciprocity in cavity optomechanics
… measurements. In Part II, we study nonreciprocal optomechanical systems with several optical and mechanical modes. We show that an optomechanical plaquette with two cavity modes coupled to two mechanical modes is a versatile system in which isolators, quantum-limited …
-
Reciprocal peer mentoring : increasing the prosocial behavior of socially neglected students
… students. In Study 1, the effectiveness of Nonreciprocal Peer Mentoring was examined, as popular peers served as mentors for neglected peers. In Study 2, neglected or rejected students mentored each other, thereby improving each other’s behavior. Taken together, the results of the studies …
-
Mechanisms of retroviral replication
… NC domain was shown to be the determinant of nonreciprocal RNA recognition by these two viruses.;This study was intended to determine biological activities of previously generated MLV- and SNV-derived Gag-Pol chimeras that retained ability to specifically package viral RNA, but rendered …
Page 1 of 2