For years, the quantum optics community has been testing the limits on laser size: How small can you go? Thanks to advances in semiconductor crystal growth and fabrication techniques, the answer is now wavelength-scale.
© 2008 Optical Society of America
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H.-G. Park, M.-K. Seo, S.-H. Kim, and Y.-H. Lee, "Electrically Pumped Photonic Crystal Nanolasers," Optics & Photonics News 19(5), 40-45 (2008)