Dispersive Grating

Given that cooking is on so many minds this afternoon (including mine), I have to agree to "dispersive grating" does sound like a messy and/or distributed method for grating carrots, cheese or turnips. But that's not the "dispersive grating" that UC San Diego electrical engineering PhD student Dawn Tan developed.

Scanning electron micrograph of dispersive grating before deposition of SiO2 overcladding. (Decorative blue filter added to image.)  Image credit: UC San Diego / Dawn Tan

Her dispersive grating is for manipulating light on the nanoscale in order to compress pulses of light on computer chips. This kind of on-chip pulse compression is crucial for making the optical interconnects that will replace the copper wires that connect chips in computers of the future.

Read more about this silicon photonics advance published in the journal Nature Communications.

On-Chip Light Pulses / Nature Communications

The idea of using light to carry information around within computers has been around for a long time, but making it happen has been difficult. Electrical engineers from UC San Diego took an important step forward when they created a light pulse compressor that works on silicon chips. Compressing light pulses on chips will be necessary to realize optical time division multiplexing or OTDM.

“In communications, there is this technique called optical time division multiplexing or OTDM, where different signals are interleaved in time to produce a single data stream with higher data rates, on the order of terabytes per second. We’ve created a compression component that is essential for OTDM,” said electrical engineering PhD student Dawn Tan, the first author on a new Nature Communications paper that describes the work.

The UC San Diego electrical engineers say they are the first to report a pulse compressor on a CMOS-compatible integrated platform that is strong enough for OTDM.

“In the future, this work will enable integrating multiple ‘slow’ bandwidth channels with pulse compression into a single ultra-high-bandwidth OTDM channel on a chip. Such aggregation devices will be critical for future inter- and intra-high speed digital electronic processors interconnections for numerous applications such as data centers, field-programmable gate arrays, high performance computing and more,” said Yeshaiahu Fainman, a professor in the Department of Electrical and Computer Engineering in the UC San Diego Jacobs School of Engineering and the last author on the new paper.

Scanning electron micrograph of dispersive grating before deposition of SiO2 overcladding. It is this dispersive grating that is responsible for the record breaking pulse compression. (Decorative blue filter added to image.)  Image credit: UC San Diego / Dawn Tan

Scanning electron micrograph of dispersive grating before deposition of SiO2 overcladding. It is this dispersive grating that is responsible for the record breaking pulse compression. (Decorative blue filter added to image.)  Image credit: UC San Diego / Dawn Tan

Flying School Bus: Visions of the Future

See Zach Salin holding his flying school bus here.

A flying school bus isn't on the current list of Global TIES projects, but according to Zach Salin's whimsical drawing from the Jacobs School booth at UC San Diego Founders' Day, 50 years from now, that's what Jacobs School undergrads might be working on.

I can only assume the bus is running on hydrogen extracted from water via a process that requires very little or no energy to generate and store the hydrogen. 

Considering humanitarian engineering project of the future is a fun, mind-bending exercise. Anyone else have ideas of what Global TIES students will be working on in 50 years? Leave a comment or email ideas to me at: dbkane AT ucsd DOT edu

UCSD@50 Special Section in the San Diego Union Tribune

On Sunday Nov 14, the Union Tribune ran a special section outlining some of the history and highlights of UC San Diego's first 50 years.

Check out the coverage online: http://www.signonsandiego.com/ucsd-50/

Below is a screen shot of one of the pages. It includes future looking quotes from UC San Diego Bioengineering professor Gert Cauwenberghs and NanoEngineering professor Joseph Wang.

The special section includes information on how structural engineers from the UC San Diego Jacobs School of Engineering played an important role in retrofitting bridges to prepare them for earthquakes.

(That same page also has a great image of Jacobs School undergrads floating in near-zero gravity in order to made better space toilets.)

Founders' Day Photo Booth: Your Vision of the Next 50 Years

More than 150 people drew their visions of the next 50 years at a photo booth at a celebration of the University of California, San Diego’s first 50 years.

The official photo booth “directions” challenged people to envision the future of information technology and communications, health and medicine, and solutions for sustainability. Brain-to-brain and brain-to-human communications systems caught people’s imaginations, as did a wide range of sustainability solutions, and stem cell and genome-based medicines. Lots of students took on the task of envisioning the UC San Diego of the future.

A few of the 300+ photo booth images on the Jacobs School flickr site are linked below.

UC San Diego Founders’ Day photo booth directions. Side 1.  Side 2.

Conversation via telepathy:

“I have cancer. But my body will heal itself”

“I can perform photosynthesis.”

All will communicate using American Sign Language. How cool would that be?? Bilingual!!

It will all be telepathy with an option of “out of office” message from your head.

Stable climate!

Way less traffic since we can fly.

Peace

UC San Diego cloud campus

UC San Diego stepping out of the box

Flying Geisel

Global TIES flying school bus

UC San Diego Bioengineering Professor Shyni Varghese: "We need to know what is happening in nature before we can successfully mimic it"

UC San Diego Professor Shyni Varghese’s bioengineering research projects span the continuum from basic research to translational work aimed at bridging the bench-to-bed divide. The lab, however, is united by one overarching goal: to treat dysfunctional tissues or organs using stem cells and healthy tissues derived from stem cells.

“I strongly believe that if we don’t fundamentally understand the science, then the translational work cannot happen. We need to know what is happening in nature before we can successfully mimic it,” said Varghese.

Read about a recent project from the Varghese lab that was led by undergraduate bioengineering students from the UC San Diego Jacobs School of Engineering.

Undergrad Bioengineers Advance Stem Cell Science at UC San Diego

Han Lim (right)and bioengineering professor Shyni Varghese (left) in 2008.  Lim is one of the bioengineering undergraduates who created an artificial environment for stem cells that simultaneously provides the chemical, mechanical and electrical cues necessary for stem cell growth and differentiation.

 

 

Check out the stem cell research performed by undergraduate bioengineers at UC San Diego.

The translucent materials bridging the dishes in the photo are “agarose salt bridges” -- part of the electrochemical cell used to subject hydrogels to an electric field. Learn more.