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Mark Brongersma develops nanostructured materials and devices for manipulating light, particularly in plasmonics. His Stanford profile describes research on electronic and photonic devices at the nanoscale.^[ref] He coauthored the indium tin oxide study that links optical behavior to band nonparabolicity.^[ref]

A central design tradeoff is between concentrating an optical field and dissipating its energy. Strong confinement can make a small region interact intensely with light, but absorption and finite carrier mobility can limit how long that energy persists. A useful device description therefore needs both its mode geometry and its loss mechanisms. Treating a material's optical response as fixed while changing its carrier population can miss another part of that tradeoff.

By Xiaoge Liu, Junghyun Park, Ju-Hyung Kang, Hongtao Yuan, Yi Cui, Harold Hwang and Mark Brongersma. Applied Physics Letters 105, 181117 (2014). Figure 3: Hall measurements, carrier density, optical plasma frequency and mobility. Byline corroborated by Stanford SIMES: simes.stanford.edu/publications/quantum?page=21