Welcome to the Capasso Group!

Metalenz: the Harvard Capasso group start-up

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Read the story about Flat Optics, Professor Capasso, and Metalenz at the Harvard Gazette and his interview with Nature Photonics on Metaoptics for the consumer market.

Metalenz and UMC will fabricate mass-market metasurfaces in Singapore (Metalenz press release, Forbes article).

Find out more about Metalenz here: https://www.metalenz.com/. Also see a press release from the Harvard Office of Technology Development, a New York Times article, IEEE Spectrum, and an SPIE news article.

Latest News

large scale meta lenses

Imaging the Cosmos with All-Glass 100mm Metalens

January 18, 2024

Metalenses, or flat lenses, are collections of tiny nanostructures arranged on a flat surface that focus incident light in a similar manner to conventional curved refractive lenses. Although metalenses for visible light can be extremely light and thin compared to their refractive counterparts, a big challenge is that their nanostructures have to be smaller than the wavelength of the light they are manipulating. For visible light, these nanostructures have to be 200 times smaller than a strand of hair. Their tiny geometries also mean that a large diameter lens at the scale of those used...

Read more about Imaging the Cosmos with All-Glass 100mm Metalens
Daniel and Joon-Suh with their committees

Dr. Soon Wei Daniel Lim and Dr. Joon-Suh Park successfully defend theses!

December 6, 2023

This fall, Dr. Soon Wei Daniel Lim and Dr. Joon-Suh Park have successfully defended their theses. In their time in the Capasso group, Daniel has been working on singularity engineering with metasurfaces and Joon-Suh has been working on the development of metasurface fabrication protocols for both prototyping and mass production. Additionally, they have made both made invaluable contributions to the work of the entire group group in taking on responsibilities for group servers, this website and fabrication. We are all grateful, and wish both all the best in their future...

Read more about Dr. Soon Wei Daniel Lim and Dr. Joon-Suh Park successfully defend theses!
Time-domain optimized 3D resonator

Novel approach for gradient computation in photonic inverse design

November 15, 2023

In the recently published ACS Photonics paper titled "Time Reversal Differentiation of FDTD for Photonic Inverse Design", co-first authors Jerry Tang Rui Jie and Soon Wei Daniel Lim present a novel approach for computing gradients in finite difference time domain (FDTD) simulations for photonic inverse design. Their technique surmounts the memory constraints inherent in automatic differentiation (AD) and preserves the computational efficiency of the state-of-the-art adjoint method. The method calculates gradients by replaying time-dependent fields at lossy boundaries, which significantly...

Read more about Novel approach for gradient computation in photonic inverse design
Ahmed in the lab

Ahmed Dorrah wins the 2023 Optica Foundation Challenge

October 11, 2023

Dr. Dorrah has received a $100,000 grant from the Optica Foundation for his proposed work entitled: “Structured light generation and sensing with metasurfaces for THz communications”. Ahmed is one of 10 recipients of the award, which provides seed money to early-career professionals to investigate impactful ideas in environment, health, and information. The award money will help build a compact wavefront sensor which can construct 2D maps of the incident THz radiation (including its...

Read more about Ahmed Dorrah wins the 2023 Optica Foundation Challenge
Polarization gradient trapping

A new principle of optical trapping leveraging the polarization gradient

October 6, 2023

We present new principles underlying optical trapping and manipulation techniques by introducing an additional degree of freedom: the polarization gradient found in evanescent fields. These evanescent fields are common at the micro and nano-scales. When generated by guided modes in integrated waveguides, these evanescent fields exhibit transverse spin and Belinfante momentum. Both of these properties can be harnessed for optical trapping and micromanipulation. Our technique can be integrated with photonic integrated circuits to leverage their rapid construction and widespread deployment...

Read more about A new principle of optical trapping leveraging the polarization gradient
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