Evanescent Mode Photoemission

Ahsan, Ragib [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000238337851); Kachwala, Alimohammed [Arizona State University, Tempe, AZ (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)]; Chae, Hyun Uk [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000276552907); Priyoti, Anika Tabassum [University of Southern California, Los Angeles, CA (United States)] (ORCID:0009000840497580); Chubenko, Oksana [Arizona State University, Tempe, AZ (United States); Northern Illinois University, DeKalb, IL (United States)]; Ullattuparambil, Anagha [Arizona State University, Tempe, AZ (United States)]; Wu, Zezhi [University of Southern California, Los Angeles, CA (United States)] (ORCID:0009000006876271); Kapadia, Rehan [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000276110551); Karkare, Siddharth [Arizona State University, Tempe, AZ (United States)] (ORCID:0000000277590032)

doi:10.1021/acs.nanolett.5c03185

DOE OSTI · 3364831

Evanescent Mode Photoemission

Ahsan, Ragib [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000238337851)·Kachwala, Alimohammed [Arizona State University, Tempe, AZ (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)]·Chae, Hyun Uk [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000276552907)·Priyoti, Anika Tabassum [University of Southern California, Los Angeles, CA (United States)] (ORCID:0009000840497580)·Chubenko, Oksana [Arizona State University, Tempe, AZ (United States); Northern Illinois University, DeKalb, IL (United States)]·Ullattuparambil, Anagha [Arizona State University, Tempe, AZ (United States)]·Wu, Zezhi [University of Southern California, Los Angeles, CA (United States)] (ORCID:0009000006876271)·Kapadia, Rehan [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000276110551)·Karkare, Siddharth [Arizona State University, Tempe, AZ (United States)] (ORCID:0000000277590032)

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Abstract

Photoemission of electrons from solid surfaces into vacuum is routinely used in two configurations: reflection mode, in which light is incident on the emitting surface, and transmission mode, in which light illuminates the photoemissive material from behind. Here, using silicon nitride waveguides integrated beneath a high quantum efficiency cesium antimonide thin film, we demonstrate a new photoemission regime─the evanescent mode photoemission─in which light travels parallel to the surface in the waveguide while evanescently coupling into the thin film to excite and emit photoelectrons. Furthermore, our experiments show that this configuration enables direct visualization of guided optical modes over an unprecedented range (∼100 nm to 1 mm) and allows electron beam shaping at the source with transverse features well below ∼600 nm, establishing evanescent mode photoemission as a new platform for nanoscale optical field mapping and precise generation of electron beams.

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Electron Sources Evanescent Coupling Light Photoemission Photonics Quantum mechanics Waveguide Modes Waveguides

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Ahsan, Ragib [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000238337851), Kachwala, Alimohammed [Arizona State University, Tempe, AZ (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)], Chae, Hyun Uk [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000276552907), Priyoti, Anika Tabassum [University of Southern California, Los Angeles, CA (United States)] (ORCID:0009000840497580), Chubenko, Oksana [Arizona State University, Tempe, AZ (United States); Northern Illinois University, DeKalb, IL (United States)], Ullattuparambil, Anagha [Arizona State University, Tempe, AZ (United States)], Wu, Zezhi [University of Southern California, Los Angeles, CA (United States)] (ORCID:0009000006876271), Kapadia, Rehan [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000276110551), Karkare, Siddharth [Arizona State University, Tempe, AZ (United States)] (ORCID:0000000277590032). 2025-10-13. Evanescent Mode Photoemission. https://doi.org/10.1021/acs.nanolett.5c03185

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