Metalenses have revolutionized the way we control visible and infrared light, with numerous applications in research and technology. However, it has been challenging to use them for extreme ultraviolet (EUV) light, which has much smaller wavelengths (around 50 nanometers) compared to visible light (400 to 700 nanometers). Since EUV light is absorbed by all materials, traditional lenses cannot bend and control it.

In this groundbreaking discovery, we have found that tiny holes in silicon can guide EUV light in a vacuum. This enables us to change the properties of EUV light on a...

DARPA Program Manager Dr. Rohith Chandrasekar presented the 10 cm visible light metalens as part of the DARPA FORWARD conference on August 30-31, 2022 at Colorado State University. See the embedded video recording of the presentation!

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Although the field of gas phase rotational spectroscopy is mature and millions of rotational spectral lines have been measured in hundreds of molecules with sub-MHz accuracy, it remains a challenge to measure these rotational spectra in excited vibrational modes with the same accuracy. Based on the recently demonstrated quantum cascade laser (QCL) pumped molecular laser (QPML) we demonstrate how an infrared QCL may be used to enhance absorption strength or induce lasing of terahertz rotational transitions in highly excited vibrational modes in order to measure their frequencies more...

Electro-optic modulators change the intensity of light in response to electric signals and have attracted much attention recently as they enable active photonics. Reaching gigahertz speeds is an important milestone that makes applications in remote sensing and communications accessible. Most demonstrations target either on-chip or fiber applications. Instead, modulators that operate on free-space light have long been very challenging to realize. Here, we show that a thin film metasurface from sub-wavelength Mie resonators enables highly efficient and ultra-compact modulation of light up...