OSA Science & Applications of Nanolasers Incubator: Day 2
By Shuai Sun, George Washington University
Day 2 of the Science & Applications of Nanolasers Incubator began with a session on Exploring Near-Field Effects. One of the hosts Ren-Min Ma, started it off with talk about sensing with nanolasers. First he introduced the hyper circle for emerging technologies and recent applications of microprocessors that using integrated optical components on-chip. Then, he pointed out several drawbacks about nano lasers, such as beam divergence and low collection efficiency. To solve these, he proposed to use retrieval directionality by waveguide coupling in order to couple about 80% of the emission energy and about 30% overall efficiency. The key point of Dr. Ma’s talk is that plasmonic lasers can have strong local field that can be used locally. Moreover, he also introduced the LESPR sensor which is the most sensitive SPR sensor (0.7 ppb) by now with its optical characterization and sensitivity curves. Ertugrul Cubukcu from UC San Diego continued the session by introducing the motivations, recent plasmonic antenna applications, and the forces in nanophotonics and plasmonics. Then he showed his recent work of a plasmonic absorber using the concept hybridization of resonance. By attaching the metal reflector, it is able to enhance the device absorption significantly. For the last talk in this section, host Rupert Oulton gave his talk about generating high intense light using hybrid gap plasmons. First he introduced the top-down etch-less hybrid plasmonic waveguide and passive hybrid gap plasmon waveguide. Later on, he showed the structure of GaAs plasmonic laser with its performance curves.
After a short break, the Incubator entered the last section Reassessing Our Motivation for Small Lasers. Ning Li from IBM, gave his talk from the industry point of view in nanoscale light source on Silicon. He mentioned that IBM now is trying to shrink big size off-chip lasers onto the chip and one way to achieve that is monolithic III-V nanolasers on Silicon. He then showed a couple of results of cavity properties, above/below threshold power/bandwidth curves and heat dissipation map. Also he predicted that the final economic goal should be lower than one cent per die eventually. The advantages for monolithic III-V nanolasers are the high yield, low cost, high operating speed and the ability for integration, however, the challenges are the materials, process, device design and systems. Zetian Mi, McGill University, discussed electrically pumped III-Nitride nanowire lasers. He first spoke about the need for deep visible and ultraviolet nano and micro scale lasers. The main challenges that he mentioned in the material aspect are the high surface recombination problem and the poor current conduction problem. He also introduced the nanowire LED with different emission wavelength over broad range only by changing the diameters of the device on the same platform. At last, he showed the recent 2D MoS2 laser and its related performance. The last speaker, Jacob Khurgin from Johns Hopkins University, talked about how to make small metal clad lasers. He introduced a few nanolasers and nanowires and concluded their common feature. Then he went through the mathematical proofs about of the reason why we need free carriers, why using metal and other fundamental questions. He discussed the diode laser and metal clad QCL and focused on the gap analysis under different wavelength. Moreover, he compared the VCSEL with SPASER/SPED in the aspects of power, linewidth and frequency. Finally, he suggested that in order to make a decent nano laser, we need to a) move the active layer away from the metal; 2) keep at least one side longer than the wavelength and c) consider the incoherent emitters.
Following a final panel discussion, the hosts wrapped up the Incubator by leading a short discussion on general outlook for the future nanoscale light sources and discussed potential next steps for the group to ensure the presentations and discussion from this program continue to move forward.
Thank you for reading!
Incubator host Renmin Ma, Peking University, discussing Sensing with Nanolasers
Panelists for Reassessing Our Motivation for Small Lasers discussion including Ning Li from IBM; Jacob Khurgin, Johns Hopkins University and Zetian Mi, McGill University with session moderator Josh Conway, DARPA.
Members of the George Washington University student chapter who attended the Incubator including Shuai Sun (the Incubator blogger), Hani Nejadriahi (chapter president), Zhizhen Ma and Mohammad H. Tahersima with their new chapter banner.
Posted: 9 September 2016 by
Shuai Sun, George Washington University
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