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2015

Is ranking just a myth? How assessment kills imagination and creativity, at Brown Univeristy (Providence, RI), Monday, September 28, 2015:
talk_2527.pdf
Why is it that stellar students sometimes fail in the workplace while dropouts succeed? One reason is that most, if not all, of our current assessment practices are inauthentic. Just as the lecture focuses on the delivery of information to students, so does assessment often focus on having students regurgitate that same information back to the instructor. Consequently, assessment fails to focus on the skills that are relevant in life in the 21st century. Assessment has been called the "hidden curriculum" as it is an important driver of students' study habits. Unless we rethink our approach to... Read more about Is ranking just a myth? How assessment kills imagination and creativity
Less is More: Extreme Optics with Zero Refractive Index, at Physics Colloquium, Brown Univeristy (Providence, RI), Monday, September 28, 2015:
talk_2370.pdf
Nanotechnology has enabled the development of nanostructured composite materials (metamaterials) with exotic optical properties not found in nature. In the most extreme case, we can create materials which support light waves that propagate with infinite phase velocity, corresponding to a refractive index of zero. This zero index can only be achieved by simultaneously controlling the electric and magnetic resonances of the nanostructure. We present an in-plane metamaterial design consisting of silicon pillar arrays, embedded within a polymer matrix and sandwiched between gold layers. Using an... Read more about Less is More: Extreme Optics with Zero Refractive Index
Confessions of a converted lecturer, at Tang Institute, Phillips Academy (Andover, MA), Monday, September 21, 2015:
talk_2392.pdf
I thought I was a good teacher until I discovered my students were just memorizing information rather than learning to understand the material. Who was to blame? The students? The material? I will explain how I came to the agonizing conclusion that the culprit was neither of these. It was my teaching that caused students to fail! I will show how I have adjusted my approach to teaching and how it has improved my students' performance significantly
Flipping the classroom and never looking back, at The Digital Education Show Middle East (Dubai, United Arab Emirates), Tuesday, September 15, 2015:
talk_2469.pdf
I thought I was a good teacher until I discovered my students were just memorizing information rather than learning to understand the material. Who was to blame? The students? The material? I will explain how I came to the agonizing conclusion that the culprit was neither of these. It was my teaching that caused students to fail! I will show how I flipped my classroom and how it has improved my students' performance significantly
Creating the ultimate flipped classroom - A step by step guide for Peer Instruction, at The Digital Education Show Middle East (Dubai, United Arab Emirates), Monday, September 14, 2015:
talk_2470.pdf
This short-course introduces participants to the ideas of Peer Instruction (PI) and Just- in-Time-Teaching (JiTT), two research-based methods for engaging students, improving conceptual understanding, increasing retention in courses and programs, and enhancing academic performance. Participants will also learn about a new approach to instructional design. Finally, participants will apply the knowledge gained to a specific course module they are (or will be) teaching, by re-designing (or designing) the syllabus for this course module and developing a plan for implementing PI and JiTT.

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Femtosecond laser micromachining, at Mexican Optics and Photonics Meeting 2015 (León, Guanajuato, Mexico), Thursday, September 10, 2015:
talk_2498.pdf
When femtosecond laser pulses are focused tightly into a transparent material, the intensity in the focal volume can become high enough to cause nonlinear absorption of laser energy. The absorption, in turn, can lead to permanent structural or chemical changes. Such changes can be used for micromachining bulk transparent materials. Applications include data storage and the writing of waveguides and waveguide splitters in bulk glass, fabrication of micromechanical devices in polymers, and subcellular photodisruption inside single cells.
On-chip zero index metamaterials, at Advanced Laser Applications Workshop, Korea Institue of Machinery and Materials (Daejeon, South Korea), Friday, August 28, 2015:
talk_2516.pdf
Impedance-matched metamaterials with zero refractive index can be achieved by exploiting a Dirac cone at the center of the Brillouin zone. We present an in-plane Dirac-cone metamaterial consisting of low-aspect-ratio silicon pillar arrays in an SU-8 matrix with top and bottom gold layers. Using an integrated nano-scale prism constructed of the proposed material, we demonstrate unambiguously a zero refractive index in the optical regime. This design serves as a novel on-chip platform in the optical regime to explore the exotic physics of Dirac-cone metamaterials and to implement applications... Read more about On-chip zero index metamaterials
Peer Instruction, at Korea Advanced Institute of Science and Technology (Daejeon, South Korea), Thursday, August 27, 2015:
talk_2515.pdf
The basic goals of Peer Instruction are to encourage and make use of student interaction during lectures, while focusing students' attention on underlying concepts and techniques. The method has been assessed in many studies using standardized, diagnostic tests and shown to be considerably more effective than the conventional lecture approach to teaching. Peer Instruction is now used in a wide range of science and math courses at the college and secondary level. In this 2-3 hour long workshop, participants will learn about Peer Instruction, serve as the "class" in which Peer Instruction is... Read more about Peer Instruction
Confessions of a converted lecturer, at Korea Advanced Institute of Science and Technology (Daejeon, South Korea), Thursday, August 27, 2015:
talk_2514.pdf
I thought I was a good teacher until I discovered my students were just memorizing information rather than learning to understand the material. Who was to blame? The students? The material? I will explain how I came to the agonizing conclusion that the culprit was neither of these. It was my teaching that caused students to fail! I will show how I have adjusted my approach to teaching and how it has improved my students' performance significantly
Laser doping and texturing of silicon for advanced optoelectronic devices, at 11th Conference on Lasers and Electro- Optics Pacific Rim (CLEO-PR 2015) (Busan, South Korea), Tuesday, August 25, 2015:
talk_2458.pdf
Irradiating a semiconductor sample with intense laser pulses in the presence of dopants drastically changes the optical, material and electronic properties of the sample. The properties of these processed semiconductors make them useful for photodetectors and, potentially, intermediate band solar cells. This talk discusses the processes that lead to doping and surface texturing, which both increase the optical absorption of the material. We will discuss the properties of the resulting material including the formation of an intermediate band. We have developed laser-processed silicon... Read more about Laser doping and texturing of silicon for advanced optoelectronic devices

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