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...

On behalf of past and current members of the Capasso group, we...

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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Resonators are important components used in various fields of Optics. Our research introduces a new type of optical resonator that has unique characteristics compared to traditional ones like Fabry-Perot cavities. We invented a new process called "cascaded-mode conversion" that can produce supermodes in the resonator. This means that one mode transforms into another mode at each reflection. This new type of resonator has different properties that are determined not only by the length and refractive index of the medium, but also by the number of coupled modes and their reflection phases....

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...

Ph.D. candidate  Joon-Suh Park has been selected as a top DARPA Riser and has presented his work on mass-producible, 10-centimeter diameter metalenses in the visible at the recent DARPA Forward conference. The 10 cm metalens is the largest ever fabricated in history, with 18.7 billion subwavelength nanostructures made of glass. 

From DARPA: DARPA...