Like a tuning fork for light, optical resonators have a characteristic set of frequencies at which it is possible to confine light waves. At these frequencies, optical energy can be efficiently stored for lengths of time characterized by the resonator Q factor, roughly the storage time in cycles of oscillation. In the last ten years there has been remarkable progress in boosting this storage time in micro and millimeter-scale optical resonators. Chip-based devices have attained Q factors of nearly 1 billion and micro-machined crystalline devices have provided Qs exceeding 100 billion.

Nanoparticles form the cornerstone in many applications of nanotechnology, and their properties are highly dependent on specific particle characteristics. We have focused on synthesis in supercritical fluids since this approach offers an energy efficient green route for the production of nanomaterials with a very high degree of control of the particle characteristics. However, in order to tailor nanoparticle characteristics insight into their formation and growth is vital and this can be achieved through in situ studies.

Drawing from numerous sources, this tutorial will summarize some of the more important recent developments in the field of energy and project current trends forward to develop some (hopefully) plausible scenarios for what might arise during the next few decades. Some key questions that will be addressed are: Is shale gas an energy bonanza,  an environmental hazard, or both? Will it sideline renewables and electric vehicles? Will it displace coal? Will solar become price competitive without subsidies, and if so when?

I shall present a lecture on my new book, Let It Shine: The 6,000-Year Story of Solar Energy, which covers the development of all solar technologies, beginning with the ancient Chinese, Greeks and Romans who designed the majority of their houses to scoop up sunlight in winter.

Semiconducting nanostructures offer potentially revolutionary advancements in the cost and performance of light emitting diodes for solid state lighting and photovoltaic energy converters. GaN based LEDs are usually fabricated on expensive substrates and suffer from a high density of threading dislocations. In addition, the high current performance of the devices is degraded by efficiency decreases (efficiency droop) that seem to be inherent to current designs.

Organic photovoltaic devices (OPVs), that utilize organic small molecules and/or polymers to directly convert sunlight to electricity, are an attractive technology for sustainable, low cost, clean energy production.  For example, solution-processed bulk heterojunction (BHJ) OPVs have attracted much attention because of their potential for flexible, light-weight, large area and low-cost device fabrication.  In particular, fullerene compounds have been the dominating electron acceptor/transport material in BHJ OPVs.  However, fullerene compounds have some disadvantages, such as

Awarded annually, the lectureship is considered the highest honor bestowed by the university faculty on one of its members. Bowers is the 58th recipient of the award. His lecture, titled “The Promise of Silicon Photonics,” is free and open to the public. A reception will follow.

Technology scaling has provided enormous growth opportunities for the information and communication industry over the last few decades. It enables faster and cheaper products that deeply touch people’s life. Technology scaling is also crucial in improving energy efficiency, a hot topic lately as users demand ubiquitous computing and communications with minimum impact to the environment. In this presentation I will highlight research at Intel Labs spanning circuits, architecture, and platform to scale technology for energy efficiency.

Recent advances from two diametric approaches for realistically approaching the fundamental limits to solar cell conversion efficiency, which follow from basic thermodynamics, will be presented. One relates to a new concept in cell architecture for concentrator photovoltaics, with the possibility of using exclusively indirect bandgap semiconductors (including Si and Ge) at irradiance values of thousands of suns. The second constitutes the first experimental demonstration of performance enhancement by recycling photon emission from high-efficiency non-concentrator (one-sun) solar cells.

Limit Cycle oscillators are used to model a broad range of periodic nonlinear phenomena. Using the Optically Injected Semiconductor Oscillator as a paradigm, we will demonstrate that at specific islands in the detuning and injection level map, the period-one oscillation frequency is simultaneously insensitive to multiple perturbation sources. In our system these include the temperature fluctuations experienced by the master and slave lasers as well as fluctuations in the bias current applied to the slave laser.