Welcome to the virtual laboratory of Prof. Xiaobo Yin's research group at the Department of Mechanical Engineering and the Materials Science and Engineering Program of the University of Colorado, Boulder.      Go Buffs!

We are looking for motivated students and postdoctoral researchers in Nanomaterials and Nanophotonics! 

We focus our research on nanoscale materials and their applications: the interdisciplinary synergy of applied physics, materials sciences, and multiple sectors of engineering.  We synthesize artificially tailored nanomaterials with unprecedented properties; we explore technologies benefiting from material properties by design; and we develop devices with unique functionalities enabled by this material engineering. More critically, we develop manufacturing technologies that enable large-scale deployment of these innovatively designed nanostructures and nanomaterials for advanced applications in photonic, electronic, and energy systems.

Materials in the Flatland: graphene and beyond 
Non-trivial electronic properties stemming from the topologies and symmetries of nanomaterials such as graphene, topological insulators, and two-dimensional electron gases (2DEG) at the interfaces of perovskite oxides result in revolutionary nanophotonic and electronic applications. There have been tremendous opportunities to introduce controllable light flow and light-matter interactions into these still young materials systems to help reveal fundamental
unknown behaviors and properties  and to identify new prospects for applications. The figure above shows the polarized nonlinear emission from a polycrystalline 2D transition metal dichalcogenide (MoS2) atomic membrane, which allows all-optical characterization of its crystal structure.

Examples of 2D materials physics and applications:
Valley-spintronic light-emitting devices,  Nature Nanotechnology 11, 598 (2016).
Excitonic Dark States in 2D Materials, Nature 513, 214 (2014).
Nonlinear Optical Materials, Science 344, 488 (2014).
Integrated Graphene Optical Modulators, Nature Materials 11, 936 (2012); Nature 474, 64 (2011).

Metamaterials: materials beyond the natural ones
Metamaterials, judiciously designed composite nanostructures, have emerged as a new frontier in science and engineering. The physical properties of a conventional material is essentially determined by its chemical constituents and bonds. However, the properties of a metamaterial are not limited by its composition but instead depend on its internal structure--leaving tremendous degrees of freedom for materials design. It not only offers an entirely new route to further enhance materials’ physical properties but enables our ability to design entirely new material properties. The figure on the left illustrates a 2D metamaterial that generates and manipulates the spin-orbit interaction of light.

Examples of designer metamaterials:
Metamaterial that highly nonlinear, Nature Materials 14, 379 (2015).
Metamaterial that self-assembles, Nature Nanotechnology 9, 1002 (2014).
Metasurface manifesting the photonic Spin hall effect, Science 339, 1405 (2013); Phys. Rev. A 93, 013839 (2016); Optics Express 24, 21177 (2016).  Also see DoE Science Highlight. 
Metamaterial that permits nonlinear optical conversion without phase matching considerations, Science 342, 1223 (2013).
Metamaterial that provides unidirectional light propagation, Nature Materials 12, 175 (2013).
Metamaterial enablement of the smallest existing optical cavity, Nature Photonics 6, 450 (2012).
Metamaterial to "see" objects smaller than the diffraction limit of light, Nature Comm. 1, 143 (2011).
Metamaterial that boosts the resolutions of sonic imaging, Nature Physics 7, 52 (2011); Nature Materials 8, 931 (2009).

Manufacturing technology for nanostructures and nanomaterials at scale
The burgeoning research on nanomaterials and nanostructured materials has opened the door for numerous applications.  However, the widespread implementations are severely impeded by the manufacturability.  Scalable, precise, reliable, and cost-effective manufacturing approaches are critically needed.  A different set of scientific and technological questions have to be asked and addressed to scale up fabrication and ultimately to use structured materials in practice.  A recent thrust of my research addresses this fundamental manufacturability challenge, and our approach embraces developing both
novel scalable manufacturing techniques and innovative metamaterial structural designs.  Right image shows our recently established Roll-to-Roll (R2R) Scalable Nanomanufacturing lab at CU Engineering Center with a 300-mm-wide metamaterial thin film manufactured for high efficient radiative cooling applications for both day and night. Levering the uniquely developed manufacturing technologies, we also plan to develop and apply large-scale energy-converting metamaterials for building technology, solar fuel systems, and greenhouse technology.

Example: Scalable manufactured hybrid metamaterial for day-time radiative cooling, Science 355, 1062 (2017).

We gracefully thank the funding supports from,

To visit, you can find us in Room 140 of the Discovery Learning Center in the Engineering and Applied Sciences Center at CU Boulder. 

Group News

Congrats to RadiCold team! Having great research shows at both 2017 ARPA-E Summit and Capitol Hill, the United States Congress. 

Congrats to Yao, Yaoguang, Sabrina, and Runnan for their Science paper appeared online! Thank you all for the great work!

Professor Yin presented an invited seminar at SunPower Inc., San Jose, California.

Professor Yin visited National Renewable Energy Laboratory (NREL), Golden, Colorado.

Professor Yin presented an invited talk at the 53rd Annual Technical Meeting of Society of Engineering Science,  Maryland.

Professor Yin presented an invited talk at the 3rd International Conference on Phononics and Thermal Energy Science (PTES 2016), Xi'an, China.

Professor Yin presented an invited talk at American Vacuum Society (AVS) 62 annual meeting, San Jose, California.

Professor Yin received the DARPA young faculty award.

Professor Yin visited and presented at United States Military Academy (USMA), West Point, NY.

Invited speech at Metamaterials'2015, the 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, Oxford, UK.

Welcome Professor Hong Su from Shenzhen University joining us as a visiting professor!

Welcome our new PhD students - Hang Yin and Jiarong Wang! Welcome aboard!

Our radiative cooling project is on the news!

Kicking off the new ARPA-E program. Thank you, the team!

Welcome Dr. Yaoguang Ma joining the group!

Professor Yin presented an invited talk at the International Symposium on Physics and Device Application of Two-dimensional Materials, Nanjing, China.

Professor Yin presented an invited talk at Nano Korea 2015, Seoul, Korea.

Professor Yin presented an invited talk for the Optics and Electronics Seminar at Stanford University, Stanford, California.

Professor Yin presented an invited talk at the 2015 SPIE Defense, Security, and Sensing Technologies conference, Baltimore, Maryland.
Professor Yin presented an invited talk at the APS March Meeting, San Antonio, TX.

Professor Yin visited and presented at Los Alamos National Laboratory, Los Alamos, NM.

Professor Yin presented an invited talk at the 45th Winder Colloquium on the Physics of Quantum Electronics (PQE-2015), Snowbird, UT.

Professor Yin presented an invited talk at the 2014 EMN International Conference, Orlando, FL.

Our optical metamaterial paper was featured in Science Daily and and LBL news.

Professor Yin presented an invited talk at the 2014 CINT (Los Alamos and Sandia National Laboratories) User Meeting and the 6th International Workshop on Electromagnetic Metamaterials, Santa Fe, NM.

Professor Yin presented an invited talk at the 2014 Annual Symposium of AVS Rock Mountain Chapter.

Our work, "Excitonic Dark States Shed Light on TMDC Atomic Layers," is highlighted in the DoE LBNL news center.

Our recent work on acoustic/sound wave control is featured in the Lawrence Berkeley National Laboratory News Center. See the news release.

Prof. Yin presented an invited talk at CLEO-2014, San Jose, CA.

Prof. Yin presented an invited talk at META'14, the 5th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Singapore.

Prof. Yin presented an invited talk at Metamaterial Workshop at IMRE (AStar), National University of Singapore, Singapore.

Prof. Yin visited and presented at Nanjing University and Northeastern University, Nanjing, China

Prof. Yin presented an invited talk at the PECS-XI, Shanghai, China.

Prof. Yin visited and presented at Sun Yat-Sen University, Guangzhou, China.

LBL news release of our recent work on nonlinear optics of 2D atomic membrane.

Prof. Yin delivered an invited talk at the MRS meeting, San Francisco, CA.

Prof. Yin presented at the APS March meeting, Denver, CO.

Prof. Yin presented at the Argonne National Laboratory, Argonne, IL. 

Prof. Yin presented at the Condense Matter Physics Seminar Series of CU Physics Department. 

Our new work on "Phase-matching-free Nonlinear Optics" is just released in Science magazine! See the news release.  The work is highlighted in the Science Research Highlight

Prof. Yin presented an invited talk at the MRS Fall meeting at Boston, MA. 

Mr. Xuyue Shi won the UROP award. Congratulations!

Prof. Yin gave the Optical, Electronic and Quantum Systems (OEQS) Seminar.

Prof. Yin presented at Colorado Photonics Industry Association (CPIA).

Prof. Yin spoke at the MCEN Graduate Seminar of CU Boulder.

Prof. Yin presented the invited talk at the OSA incubator meeting at Washington DC.

Prof. Yin presented the invited talk at Physical Sciences Symposia, 2013, Boston.

Prof. Yin's work is featured in the Science Highlights of Department of Energy (DoE) sponsored research, "Putting Light to Work at the Quantum Scale".

Prof. Yin presented an invited talk at SPIE Photonics and Optics Annual Conference 2013, San Diego, CA.

Prof. Yin presented an invited talk at Intel Inc., Santa Clara, CA. 

Dr. Yin joined the Department of Mechanical Engineering and the Materials Science and Engineering Program of the University of Colorado, Boulder.