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Title: Unzipping hBN with ultrashort mid-infrared pulses

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2];  [3];  [2];  [2]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]
  1. Columbia University, New York, NY (United States); OSTI
  2. Columbia University, New York, NY (United States)
  3. Columbia University, New York, NY (United States); Indian Institute of Technology Guwahati, Assam (India)
  4. Columbia University, New York, NY (United States); Nanyang Technological University (Singapore)
  5. Columbia University, New York, NY (United States); Cornell University, Ithaca, NY (United States)
  6. National Institute for Materials Science, Tsukuba (Japan)

Manipulating the nanostructure of materials is critical for numerous applications in electronics, magnetics, and photonics. However, conventional methods such as lithography and laser writing require cleanroom facilities or leave residue. We describe an approach to creating atomically sharp line defects in hexagonal boron nitride (hBN) at room temperature by direct optical phonon excitation with a mid-infrared pulsed laser from free space. We term this phenomenon “unzipping” to describe the rapid formation and growth of a crack tens of nanometers wide from a point within the laser-driven region. Formation of these features is attributed to the large atomic displacement and high local bond strain produced by strongly driving the crystal at a natural resonance. This process occurs only via coherent phonon excitation and is highly sensitive to the relative orientation of the crystal axes and the laser polarization. Its cleanliness, directionality, and sharpness enable applications such as polariton cavities, phonon-wave coupling, and in situ flake cleaving.

Research Organization:
Columbia University, New York, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS) KAKENHI
Grant/Contract Number:
SC0019443
OSTI ID:
2472143
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 18 Vol. 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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