Indication of Te segregation in laser-irradiated ZnTe observed by in situ coherent-phonon spectroscopy

Journal Article · Mon Sep 15 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4896039· OSTI ID:22303508

Shimada, Toru ^[1]; Frischkorn, Christian ^[2]; Wolf, Martin; Kampfrath, Tobias ^[1]

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1. Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin (Germany)
2. Department of Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin (Germany)

We irradiate a ZnTe single crystal with 10-fs laser pulses at a repetition rate of 80 MHz and investigate its resulting gradual modification by means of coherent-phonon spectroscopy. We observe the emergence of a phonon mode at about 3.6 THz whose amplitude and lifetime grow monotonously with irradiation time. The speed of this process depends sensitively on the pump-pulse duration. Our observations strongly indicate that the emerging phonon mode arises from a Te phase induced by multiphoton absorption of incident laser pulses. A potential application of our findings is laser-machining of microstructures in the bulk of a ZnTe crystal, a highly relevant electrooptic material.

• OSTI ID: 22303508
• Journal Information: Applied Physics Letters, Vol. 105, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
AMPLITUDES
IRRADIATION
LASER BEAM MACHINING
LASER RADIATION
LIFETIME
MICROSTRUCTURE
MODIFICATIONS
MONOCRYSTALS
MULTI-PHOTON PROCESSES
PHONONS
SEGREGATION
SPECTROSCOPY
ZINC TELLURIDES