Organic crystals with long-period diffraction gratings engraved directly on their surfaces by focused ion beam lithography (Conference Presentation)

Takeshi Yamao

doi:10.1117/12.2275536

19 September 2017 Organic crystals with long-period diffraction gratings engraved directly on their surfaces by focused ion beam lithography (Conference Presentation)

Takeshi Yamao

Author Affiliations +

Proceedings Volume 10360, Light Manipulating Organic Materials and Devices IV; 103600F (2017) https://doi.org/10.1117/12.2275536
Event: SPIE Organic Photonics + Electronics, 2017, San Diego, California, United States

Abstract

Laser oscillations need a combination of gain media and optical cavities. We have used as the gain media crystals of thiophene/phenylene co-oligomers (TPCOs) that are composed of inline thiophene and benzene rings, and combined them with diffraction gratings acting as the optical cavities. We have fabricated these diffraction gratings on substrates as an external cavity. Recently, we have directly engraved one-dimensional (1D) diffraction gratings on the surface of TPCO crystals by using focused ion beam (FIB) lithography. We regarded these diffraction gratings as a built-in cavity, and expected to be effective for producing narrowed emission peaks. However, the engraved parts of the crystals were quenched because the ion beam damaged the molecules. Engraving the diffraction gratings with a short period that is comparable in size to the beam spot caused weak emissions from the crystal. In the present studies, we tried to keep wide unprocessed parts on the TPCO crystals with the FIB lithography. To this end, we fabricated diffraction gratings having a long period on the crystals. We chose one of the TPCOs that shows emission maxima at around 605 and 650 nm. We laminated vapor-phase-grown crystals on substrates. We engraved the equally-spaced 300 grooves with a period of 501 nm by precisely controlling FIB process conditions. We observed the emissions perpendicular to the grating grooves as well as parallel to the crystal surface under ultraviolet light illumination from a mercury lamp. We succeeded in observing a narrowed peak at 662 nm with the crystal with the 1D diffraction grating.

Conference Presentation

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Takeshi Yamao "Organic crystals with long-period diffraction gratings engraved directly on their surfaces by focused ion beam lithography (Conference Presentation)", Proc. SPIE 10360, Light Manipulating Organic Materials and Devices IV, 103600F (19 September 2017); https://doi.org/10.1117/12.2275536

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KEYWORDS

Crystals

Diffraction gratings

Laser crystals

Ion beam lithography

Ion beams

Lithography

Optical resonators

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