journal article·2023-06Open access

Giant Nonlinear Optical Response via Coherent Stacking of In‐Plane Ferroelectric Layers

Nannan Mao, Yue Luo, Ming‐Hui Chiu, Chuqiao Shi, Xiang Ji, Tymofii S. Pieshkov, Yuxuan Lin, Hao‐Lin Tang, Austin J. Akey, Jules A. Gardener, Ji‐Hoon Park, Vincent Tung, Xi Ling, Xiaofeng Qian, William L. Wilson, Yimo Han, William A. Tisdale, Jing Kong

Advanced Materials· Volume 35· Issue 26

Abstract

Abstract Thin ferroelectric materials hold great promise for compact nonvolatile memory and nonlinear optical and optoelectronic devices. Herein, an ultrathin in‐plane ferroelectric material that exhibits a giant nonlinear optical effect, group‐IV monochalcogenide SnSe, is reported. Nanometer‐scale ferroelectric domains with ≈90°/270° twin boundaries or ≈180° domain walls are revealed in physical‐vapor‐deposited SnSe by lateral piezoresponse force microscopy. Atomic structure characterization reveals both parallel and antiparallel stacking of neighboring van der Waals ferroelectric layers, leading to ferroelectric or antiferroelectric ordering. Ferroelectric domains exhibit giant nonlinear optical activity due to coherent enhancement of second‐harmonic fields and the as‐resulted second‐harmonic generation was observed to be 100 times more intense than monolayer WS2. This work demonstrates in‐plane ferroelectric ordering and giant nonlinear optical activity in SnSe, which paves the way for applications in on‐chip nonlinear optical components and nonvolatile memory devices.
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Research context

OpenAlex topics: Photorefractive and Nonlinear Optics · Photonic and Optical Devices · Mechanical and Optical Resonators

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA

Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA

Center for Nanoscale Systems Harvard University Cambridge MA 02138 USA

Department of Physics Harvard University Cambridge MA 02138 USA

Material Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955–6900 Saudi Arabia

Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA

Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA

Department of Chemistry and Division of Materials Science and Engineering Boston University Boston MA 02215 USA

Department of Materials Science and Engineering Department of Electrical and Computer Engineering Texas A&M University College Station Texas 77843 USA

Funding

U.S. Department of Energy · Office of Science · Basic Energy Sciences · National Science Foundation · Army Research Office · Welch Foundation

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