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Ali-hajimiri
Ultra-Thin Camera Creates Images Without Lenses

06-22-17

Professor Ali Hajimiri and colleagues have developed a new camera design that replaces the lenses with an ultra-thin optical phased array (OPA). The OPA does computationally what lenses do using large pieces of glass: it manipulates incoming light to capture an image. "Here, like most other things in life, timing is everything. With our new system, you can selectively look in a desired direction and at a very small part of the picture in front of you at any given time, by controlling the timing with femto-second—quadrillionth of a second—precision," says Professor Hajimiri. [Caltech story] [ENGenious silicon photonics feature]

Tags: EE research highlights MedE Ali Hajimiri

Lihong-wang
Cutting Down on Cancer Surgeries

05-17-17

Engineers at the Optical Imaging Laboratory led by Professor Lihong Wang have developed an imaging technology that could help surgeons removing breast cancer lumps confirm that they have cut out the entire tumor—reducing the need for additional surgeries. “What if we could get rid of the waiting? With 3D photoacoustic microscopy, we could analyze the tumor right in the operating room, and know immediately whether more tissue needs to be removed,” Professor Wang explains. [Caltech story]

Tags: EE research highlights MedE Lihong Wang

Lihong-wang
Laser-Induced Sound Waves Provide Live Panoramic Views of Tissue Functions

05-10-17

Lihong Wang, Bren Professor of Medical Engineering and Electrical Engineering, and colleagues are now able to take a live look at the inner workings of a small animal with enough resolution to see active organs, flowing blood, circulating melanoma cells, and firing neural networks. "Photoacoustic tomography combines light and sound synergistically for high-resolution imaging of molecular contrast," says Professor Wang. [Caltech story] [Read the paper]

Tags: EE research highlights MedE Lihong Wang

Eye
Black Silicon Prevents Eye Implant from Gumming Up

04-13-17

Hyuck Choo, Assistant Professor of Electrical Engineering; Investigator, Heritage Medical Research Institute, and colleagues have developed an eye implant for glaucoma patients that could one day lead to more timely and effective treatment. Professor Choo has developed a passive system that eschews electronics and so needs no batteries and has no antennae. At just 600–800 micrometers in diameter, the sensor is the width of a few strands of hair. [Caltech story]

Tags: EE research highlights MedE Hyuck Choo

Lihong-wang
Seeing Deeper: An Interview with Lihong Wang

03-10-17

Using a combination of light and sound, Professor Lihong Wang is noninvasively peering deeper inside biological tissues than previously possible. His team uses three-dimensional photoacoustic microscopy and functional photoacoustic computed tomography to generate detailed color images of tumors and other structures inside the body. [Interview with Prof. Wang]

Tags: EE research highlights MedE Lihong Wang

Pietro-perona
A Birder in the Hand: Mobile Phone App Can Recognize Birds From Photos

12-14-16

Pietro Perona, Allen E. Puckett Professor of Electrical Engineering, and colleagues have developed the Merlin Bird Photo ID mobile app which uses machine-learning technology to identify hundreds of North American bird species it "sees" in photos. "This app is the culmination of seven years of our students' hard work and is propelled by the tremendous progress that computer-vision and machine-learning scientists are making around the world," says Professor Perona. "A machine that recognizes objects in images, like humans do, was a distant dream when I was a graduate student and now it's finally happening." [Caltech story]

Tags: Pietro Perona EE CMS research highlights

Chun-lin
Graduate Student Wins Best Paper Prize

11-09-16

Electrical Engineering graduate student Chun-Lin Liu, working with Professor Vaidyanathan, has received the best paper prize for his paper entitle, “Two-Dimensional Sparse Arrays with Hole-Free Coarray and Reduced Mutual Coupling". The prize was presented to him at the 50th Asilomar Conference on Signals, Systems, and Computers. [Read the paper]

Tags: P. P. Vaidyanathan Chun-Lin Liu EE honors research highlights

Changhuei-yang
Noise-Canceling Optics

10-10-16

Changhuei Yang, Professor of Electrical Engineering, Bioengineering, and Medical Engineering, and colleagues have created the visual analogue of noise-canceling headphones—a camera system that can obtain images of objects obscured by murky media, such as fog or clouds, by canceling out the glare. Their device selectively cancels the scattered light, leaving only the light that is reflected or bounced off the objects and has slipped back through the murk unmolested. [Caltech story]

Tags: Changhuei Yang EE MedE research highlights

Chun-lin
Graduate Student Wins Best Paper Prize

09-19-16

Electrical Engineering graduate student Chun-Lin Liu, working with Professor Vaidyanathan, has received the best paper prize for his paper entitle, “High Order Super Nested Arrays". The prize was presented to him at the 2016 IEEE Sensor Array and Multichannel Signal Processing Workshop. [Read the paper]

Tags: P. P. Vaidyanathan Chun-Lin Liu EE honors research highlights

Pietro-perona
Counting L.A.’s Trees

07-27-16

Professor Pietro Perona, has developed a method using Google Earth and Google Street View to count the trees in the city of Los Angeles. The process of counting the trees using human tree counters is very expensive and would cost about $3 million today. The last time the city did such counting was more than two decades ago and at the time there were 700,000 street trees. Perona has tested the methodology in a section of Pasadena where the city recently commissioned a sidewalk survey. By comparing the results to the known inventory, he determined that the computer was about 80% accurate. [LA Times story] [KPCC story]

Tags: Pietro Perona EE CMS research highlights

Department of Electrical Engineering