Where Imperfections Lead to Opportunity: Photonic Defect-Based Devices in SiC

There is often a natural assumption that “perfect form” of a material is required to produce “perfect functioning” of a device, where the function may relate to precision sensing, or the storing or transmission of information. Recently, however, there has been excitement about the performance of defects in crystalline semiconductors such as diamond and SiC. The defects are deviations from perfect, periodic crystalline order, yet can manifest optical emission at a variety of wavelengths, distinctively coupled to long spin coherence times.

Nonlinear Integrated Silicon Photonics

Silicon photonics offer a tight integration of a variety of active and passive optical and electrical components, and gained so much interest in the last decade that it is now considered one of the most promising technology for photonics applications [1]. Building on the mature fabrication techniques first developed for microelectronics allows creating photonic integrated circuits (PICs) with a high density of optical components, in high volumes and at low costs.

Energy Leadership Lecture Series: Thom Mason

Science for the Energy Challenge

If we are going to successfully tackle the problem of energy, broadly defined as providing enough energy to support higher standards of living for a growing fraction of the world’s growing population without creating intractable conflict over resources or causing irreparable harm to our environment, then substantial advances in the state of the art in energy generation, distribution, and end use are required.

The Quest – Energy, Security, and the Remaking of the Modern World

An international expert on energy, international politics and economics, Daniel Yergin is the co-founder and chairman of Cambridge Energy Research Associates, an energy research consultancy. He is an author and Pulitzer Prize-winner for his book The Prize: The Epic Quest for Oil, Money, and Power, which was turned into a PBS mini-series documentary about the economic history of the 20th century. Yergin will dynamically address the conflicting choices and visions for the world economy and the great battle over globalization.

Intermolecular Charge-Transfer States for Organic Opto-Electronics

Intermolecular charge transfer (CT) states at the interface between electron-donating and electron-accepting (A) materials in organic thin films are characterized by absorption and emission bands within the optical gap of the interfacing materials. Depending on the used donor and acceptor materials, CT states can be very emissive, or generate free carriers at high yield. The former can result in rather efficient organic light emitting diodes, via thermally activated delayed fluorescence, while the latter property is exploited in organic photovoltaic devices and photodetectors.

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