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Monolithic integration of wavelength-scale diffractive structures on red vertical-cavity lasers by focused ion beam etching

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5 Author(s)
Justice, J.P. ; Nat. Microelectron. Res. Centre, Cork, Ireland ; Lambkin, P. ; Meister, M. ; Winfield, R.
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We report the fabrication and characterization of wavelength-scale diffractive optical elements etched directly on the surface of red (660 nm) vertical-cavity surface-emitting lasers. The structures were fabricated by focused ion beam etching. Linear and two-dimensional (2-D) grating configurations were investigated. Each showed excellent suppression of the zeroth-order diffracted beam. Compared to the power from an unetched laser, ∼22% of the emission was coupled into the first order for linear gratings and 12% for the 2-D structures. Polarization was independent of grating orientation for grating pitches as small as 1λ. Threshold current increases of 35%-40% were measured.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 8 )