Effects of Thickness and Grain Size on Harmonic Generation in Thin AlN Films
High-harmonic generation from solid films is an attractive method for converting infrared laser pulses to ultraviolet and vacuum ultraviolet wavelengths and for examining the films using the generation process. In this work, AlN thin films grown on a sapphire substrate are studied. Below-band-gap th...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
|
| Series: | Photonics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6732/11/11/1078 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850147282686574592 |
|---|---|
| author | J. Seres E. Seres E. Céspedes L. Martinez-de-Olcoz M. Zabala T. Schumm |
| author_facet | J. Seres E. Seres E. Céspedes L. Martinez-de-Olcoz M. Zabala T. Schumm |
| author_sort | J. Seres |
| collection | DOAJ |
| description | High-harmonic generation from solid films is an attractive method for converting infrared laser pulses to ultraviolet and vacuum ultraviolet wavelengths and for examining the films using the generation process. In this work, AlN thin films grown on a sapphire substrate are studied. Below-band-gap third harmonics and above-band-gap fifth harmonics were generated using a Ti:sapphire oscillator running at 800 nm. A strong enhancement of the fifth-harmonic signal in the forward direction was observed from thicker 39 nm and 100 nm films compared to thinner 8 nm and 17 nm films. For the fifth harmonic generated in the backward direction, and also for the third harmonic in both the forward and backward directions, only a weak dependence of the harmonic signal on the film thickness was measured. Using both X-ray diffraction and dependence of the fifth harmonic on the laser polarization measurements, these behaviors are attributed to the crystallization and the grain size of the films, promising fifth-harmonic generation as a suitable tool to study AlN film properties. |
| format | Article |
| id | doaj-art-e22a89dae8ca46d88e27fb3a8ffbe22d |
| institution | OA Journals |
| issn | 2304-6732 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-e22a89dae8ca46d88e27fb3a8ffbe22d2025-08-20T02:27:36ZengMDPI AGPhotonics2304-67322024-11-011111107810.3390/photonics11111078Effects of Thickness and Grain Size on Harmonic Generation in Thin AlN FilmsJ. Seres0E. Seres1E. Céspedes2L. Martinez-de-Olcoz3M. Zabala4T. Schumm5Atominstitut—E141, Technische Universität Wien, Stadionallee 2, 1020 Vienna, AustriaAtominstitut—E141, Technische Universität Wien, Stadionallee 2, 1020 Vienna, AustriaInstituto de Microelectrónica de Barcelona, IMB-CNM (CSIC), Campus UAB, 08193 Barcelona, SpainInstituto de Microelectrónica de Barcelona, IMB-CNM (CSIC), Campus UAB, 08193 Barcelona, SpainInstituto de Microelectrónica de Barcelona, IMB-CNM (CSIC), Campus UAB, 08193 Barcelona, SpainAtominstitut—E141, Technische Universität Wien, Stadionallee 2, 1020 Vienna, AustriaHigh-harmonic generation from solid films is an attractive method for converting infrared laser pulses to ultraviolet and vacuum ultraviolet wavelengths and for examining the films using the generation process. In this work, AlN thin films grown on a sapphire substrate are studied. Below-band-gap third harmonics and above-band-gap fifth harmonics were generated using a Ti:sapphire oscillator running at 800 nm. A strong enhancement of the fifth-harmonic signal in the forward direction was observed from thicker 39 nm and 100 nm films compared to thinner 8 nm and 17 nm films. For the fifth harmonic generated in the backward direction, and also for the third harmonic in both the forward and backward directions, only a weak dependence of the harmonic signal on the film thickness was measured. Using both X-ray diffraction and dependence of the fifth harmonic on the laser polarization measurements, these behaviors are attributed to the crystallization and the grain size of the films, promising fifth-harmonic generation as a suitable tool to study AlN film properties.https://www.mdpi.com/2304-6732/11/11/1078high-harmonic generationlight–matter interactionnonlinear opticsnanofilmscrystal symmetries |
| spellingShingle | J. Seres E. Seres E. Céspedes L. Martinez-de-Olcoz M. Zabala T. Schumm Effects of Thickness and Grain Size on Harmonic Generation in Thin AlN Films Photonics high-harmonic generation light–matter interaction nonlinear optics nanofilms crystal symmetries |
| title | Effects of Thickness and Grain Size on Harmonic Generation in Thin AlN Films |
| title_full | Effects of Thickness and Grain Size on Harmonic Generation in Thin AlN Films |
| title_fullStr | Effects of Thickness and Grain Size on Harmonic Generation in Thin AlN Films |
| title_full_unstemmed | Effects of Thickness and Grain Size on Harmonic Generation in Thin AlN Films |
| title_short | Effects of Thickness and Grain Size on Harmonic Generation in Thin AlN Films |
| title_sort | effects of thickness and grain size on harmonic generation in thin aln films |
| topic | high-harmonic generation light–matter interaction nonlinear optics nanofilms crystal symmetries |
| url | https://www.mdpi.com/2304-6732/11/11/1078 |
| work_keys_str_mv | AT jseres effectsofthicknessandgrainsizeonharmonicgenerationinthinalnfilms AT eseres effectsofthicknessandgrainsizeonharmonicgenerationinthinalnfilms AT ecespedes effectsofthicknessandgrainsizeonharmonicgenerationinthinalnfilms AT lmartinezdeolcoz effectsofthicknessandgrainsizeonharmonicgenerationinthinalnfilms AT mzabala effectsofthicknessandgrainsizeonharmonicgenerationinthinalnfilms AT tschumm effectsofthicknessandgrainsizeonharmonicgenerationinthinalnfilms |