This workshop is designed for participants to gain a broad perspective of optics design and manufacturability of flat optics devices.
Presentation 1: Flat Optic by Keynote Speaker, Professor Federico Capasso
Plasmonic metasurfaces have demonstrated major potential for broad band wavefront control. Holographic interfaces were created by suitably patterning the metal surface wherever constructive interference between the object and the reference wave occurs, i.e. where the phase of both the incident wave and the surface plasmon polaritons (SPPs) are equal. These interfaces are able to focus SPPs excited by free-space beams that carry various topological charges. By patterning those on the window of silicon detectors, photodiodes sensitive to the orbital angular momentum of the light beam were demonstrated.
Plasmonic couplers have also been demonstrated, which use intersecting gratings to excite SPPs beams, dubbed localized cosine-Gauss beams (a new solution of the 2D Helmholtz equation), propagating without diffraction in a straight line, in analogy with axicons that create Bessel beams. SPPs propagating for more than 80 µm on gold have been demonstrated by NSOM imaging.
Finally new couplers are discussed which convert orthogonal incident polarization into counter-propagating SPP beams. This enables tunable directional coupling, polarization invariant total conversion efficiency and preservation of the incident polarization information. Both bidirectional and unidirectional launching of SPPs are demonstrated using linearly polarized and circularly polarized light of opposite handedness, respectively. This coupling scheme is further applied to circular metallic structures that generate radially convergent or divergent SPPs depending on the handedness of the circularly polarized light, illustrating that such couplers can be extended to a broad range of designs and applications.
Presentation 2: Large Area Processing of Functional Films by Dr Albert Lu, SIMTech
Emerging applications such as large area optical modulation, building integrated photovoltaics, flexible electronics and large area ambient lighting are driving research and innovation in disruptive technologies including functional materials, manufacturing processes and device design. Unlike semiconductor fabrication which batch processing of wafers, roll-to-roll processing will enable functional materials to be deposited on thin, lightweight, flexible and transparent plastic films. This presentation will address market opportunities, technology drivers and research challenges in printable functional materials, scalable high-precision roll-to-roll manufacturing and web metrology.
Presentation 3: Flat Optics Program - Multidisciplinary Research from Material, Device, to System
This talk will introduce a collaborative research program between SIMTech and Harvard University led by Professor Federico Capasso whose team has paved the way for the development of a new generation of flat and ultra-thin optical components by nanostructured optical interfaces design. A two-pronged approach has been adopted whereby: (1) SIMTech's Large Area Processing Programme collaborates on roll-to-roll processes to print functional materials on thin and flexible polymer films; (2) SIMTech's Precision Measurements Group is looking into various manufacturability issues for the potential roll-to-roll printable flat optics, including optics design scalability, multi-layer film characterization and web-metrology.
About the Speakers
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. He holds an honorary doctorate in Electronic Engineering from the University of Bologna, Italy.
Professor Capasso has co-authored over 300 papers, edited four volumes, and holds over 50 US patents.
Dr Albert Lu is Programme Manager and Senior Scientist with the Large Area Processing Programme at SIMTech. He currently leads a multi-disciplinary research team on disruptive manufacturing processes and multi-functional integration for functional films and printed electronics. He won the Lee Kuan Yew Award for Mathematics and Science in Singapore, and the Institution of Electrical Engineers Prize in United Kingdom.
Dr Yu Xia is a scientist in the Precision Measurements Group at SIMTech. She currently leads the optics team working on long-wavelength (Mid-infrared) and short-wavelength (X-ray) optics. Her research interest focuses on microstructure optics design.
2.10pm Flat Optics by Professor Federico Capasso, Harvard University
3.00pm Large Area Processing of Functional Films by Dr Albert Lu, SIMTech
3.30pm Flat Optics scaled up for infrared applications by Dr Yu Xia, SIMTech
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. To reserve a place, please register online.
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