Invited Research Lecture on 'Flat Optics based on Metasurfaces: From the Mid-infrared to the Visible' by Prof. Federico Capasso
Date: 25 Oct 2012 - 25 Oct 2012
Venue: SIMTech Auditorium, Tower Block, Level 3
Conventional optical components such as lenses rely on gradual phase shifts accumulated during light propagation to shape light beams. We have recently shown how new degrees of freedom in optical design can be attained by introducing in the optical path abrupt phase changes over the scale of the wavelength, which leads to generalized laws for reflection and refraction. Phase discontinuities enable wavefront engineering with unprecedented flexibility, which is promising for a wide variety of planar optical components such as lenses free of monochromatic aberrations, axicons, background free broadband quarter wave plates and spiral phase plates that create optical vortices. Finally we have recently shown that the phenomenon of thin film interference, known for hundreds of years, which gives rise to vivid coloring when the thickness is on the scale of the wavelength, under appropriate conditions can persist in ultrathin, highly absorbing films of a few to tens of nanometres in thickness. This technology has the potential for a variety of applications from ultrathin photodetectors and solar cells to optical filters, to labelling, and even the visual arts and jewellery.
9.15am Commencement of Lecture
About the Speaker
Professor Federico Capasso received the doctor of Physics degree, summa cum laude, from the University of Rome, Italy, in 1973 and after doing research in fiber optics at Fondazione Bordoni in Rome, joined Bell Labs in 1976. In 1984 he was made a Distinguished Member of Technical Staff and in 1997 a Bell Labs Fellow. In addition to his research activity Prof. Capasso has held several management positions at Bell Labs including Head of the Quantum Phenomena and Device Research Department and the Semiconductor Physics Research Department (1987-2000) and Vice President of Physical Research (2000-2002). He joined Harvard on January 1, 2003. He is internationally known for his pioneering research on bandstructure engineering of artificially structured semiconductors and devices, which has opened up new directions in materials research, mesoscopic physics, photonics, electronics, and nanotechnology. He and his collaborators invented and developed the quantum cascade laser, a fundamentally new light source, which is now commercial and has potentially wide ranging applications to trace gas analysis and chemical sensing (atmospheric chemistry, combustion diagnostics, pollution monitoring, industrial process control, medical diagnostics, homeland security) and telecommunications. His current research in quantum electronics deals with the design of new light sources based on giant optical nonlinearities in quantum wells such as Raman injection lasers, inversioless injection lasers and widely tunable sources of TeraHertz radiation based on difference frequency generation and Raman lasers. He has also carried out research on quantum chaos in deformed microlasers which led him and his collaborators to invent microlasers operating on bow-tie modes. More recently his research has expanded to high-precision measurements of Casmir forces using MEMS (MicroElectroMechanicalSystems) and other quantum electrodynamical effects such as the torque between birefringent materials due to vacuum fluctuations. He is a Fellow of the American Physical Society, the Institute of Physics (UK), the Optical Society of America, the American Association for the Advancement of Science, IEEE and SPIE.
Who Should Attend
Scientist, engineer, academic staff members and students, R&D manager, industry professionals.
Registration for the video seminar is free of charge. Seats are available on a first-come, first-served basis.
For technical enquiries, please contact Dr Yu Xia, Email: xyu@SIMTech.a-star.edu.sg
For general enquiries, please contact Alice Koh, Email: kohth@SCEI.a-star.edu.sg
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