4,447 research outputs found

    Unidirectional Lasing Emerging from Frozen Light in Non-Reciprocal Cavities

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    We introduce a class of unidirectional lasing modes associated with the frozen mode regime of non-reciprocal slow-wave structures. Such asymmetric modes can only exist in cavities with broken time-reversal and space inversion symmetries. Their lasing frequency coincides with a spectral stationary inflection point of the underlying passive structure and is virtually independent of its size. These unidirectional lasers can be indispensable components of photonic integrated circuitry.Comment: 5 pages, 3 figure

    Triangular nanobeam photonic cavities in single crystal diamond

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    Diamond photonics provides an attractive architecture to explore room temperature cavity quantum electrodynamics and to realize scalable multi-qubit computing. Here we review the present state of diamond photonic technology. The design, fabrication and characterization of a novel triangular cross section nanobeam cavity produced in a single crystal diamond is demonstrated. The present cavity design, based on a triangular cross section allows vertical confinement and better signal collection efficiency than that of slab-based nanocavities, and eliminates the need for a pre-existing membrane. The nanobeam is fabricated by Focused-Ion-Beam (FIB) patterning. The cavity is characterized by a confocal photoluminescence. The modes display quality factors of Q ~220 and are deviated in wavelength by only ~1.7nm from the NV- color center zero phonon line (ZPL). The measured results are found in good agreement with 3D Finite-Difference-Time-Domain (FDTD) calculations. A more advanced cavity design with Q=22,000 is modeled, showing the potential for high-Q implementations using the triangular cavity design. The prospects of this concept and its application to spin non-demolition measurement and quantum computing are discussed.Comment: 18 pages,7 figure

    Book Review: Victims as Offenders: The Paradox of Women’s Violence in Relationships

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    Review of Victims as Offenders: The Paradox of Women’s Violence in Relationships by Susan L. Mille

    Effects Of Instructor Immediacy And Student Need For Cognition On Student Motivation And Perceptions Of Learning

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    This study built on previous literature linking instructor immediacy, student motivation, and student learning. The purpose of this research was to examine main and interaction effects of instructor immediacy and student trait motivation on student state motivation and cognitive learning. A main effect of instructor nonverbal immediacy on student state motivation and cognitive learning was found to be statistically significant. Further exploratory research did not yield statistical significance for a main effect of trait motivation, as measured by need for cognition, on student state motivation and cognitive learning, nor an interaction effect of immediacy and trait motivation on both state motivation and cognitive learning

    Imagining what Eve would have said after Cain’s murder of Abel: rhetorical practice and Biblical interpretation in an early Byzantine homily

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    Why does the story of Cain and Abel leave out what we would consider essential details? Is there a reason for this silence? Works of fiction that imagine a historical event from an untold perspective are as popular as ever, and recent years have seen an influx of fiction that gives voice to silent characters in older works of fiction. By imagining what other characters might have said, we also come to a deeper understanding of the text

    To Have and to Hold

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    The relationship between mere objects, richly aesthetic objects, and the emotional structure ofexperience is considered in three parts. The first part attempts to develop the relationship between object-ness and art-ness from the intellectual tradition of ordinary language philosophy. The first part ends with the death of my wife. The second part provides a view of the emotional structure of grief-experienced in the form of a poem. The third part attempts to reconcile the lost and the kept, as intellectual and emotional structures are re-aligned. The thesis therefore attempts to both show and tell the origin and nature of the material works I developed over the past six years
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