Sub-nanojule threshold lasing in 5x5&#956;m2 organic photonic boxes

Maik Langner; Markas Sudzius; Susanne I. Hintschich; Hartmut Fröb; Vadim G. Lyssenko; Karl Leo

doi:10.1117/12.781158

16 April 2008 Sub-nanojule threshold lasing in 5×5 μm² organic photonic boxes

Maik Langner, Markas Sudzius, Susanne I. Hintschich, Hartmut Fröb, Vadim G. Lyssenko, Karl Leo

Proceedings Volume 6999, Organic Optoelectronics and Photonics III; 699902 (2008) https://doi.org/10.1117/12.781158
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

×The lasing threshold of a microcavity is mainly determined by the spontaneous emission factor β, which is inversely proportional to the mode volume V_c. We demonstrate an experimental way to decrease the mode volume via lateral structuring of the microcavity. This redistributes both number and density of the transversal cavity modes, which increases the amplitude of the internal electromagnetic field. Our samples are microcavities with an active layer of variable thickness (0.2 to 2 μm) made of tris-(8-hydroxyquinoline) aluminium (Alq₃) doped with 4-(dicyanomethylene)-2- methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM). With thermal coevaporation through a shadow mask, this layer is structured into an array of photonic boxes square-shaped microcavities with an area of 55 μm₂. Using a microscope objective, we record the spatial distribution of the cavity transmission spectra with submicron resolution. The modes of the photonic boxes show a clear discretization, which is due to the multidimensional optical confinement. Under selective excitation of the DCM molecules via a focused pulsed laser (532 nm, 1.5 ns, 2 kHz , &diameter; ≈ 3μm), we record the spatially and spectrally resolved emission of single photonic boxes. The laser pulse energy is varied to obtain input-output curves of the cavity modes. At an excitation energy of ~30 pJ, we observe superlinear growth as well as a spectral narrowing of the emission from the lowest energy mode of a single photonic box. For this lasing transition, we determine a spontaneous emission factor β of ≈0.01.

Citation Download Citation

Maik Langner, Markas Sudzius, Susanne I. Hintschich, Hartmut Fröb, Vadim G. Lyssenko, and Karl Leo "Sub-nanojule threshold lasing in 5×5 μm² organic photonic boxes", Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 699902 (16 April 2008); https://doi.org/10.1117/12.781158

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available