Sub-wavelength probing and modification of photonic crystal nano-cavities

✍ Scribed by Silvia Vignolini; Francesca Intonti; Francesco Riboli; Margherita Zani; Anna Vinattieri; Diederik S. Wiersma; Marcello Colocci; Laurent Balet; Lianhe Li; Marco Francardi; Annamaria Gerardino; Andrea Fiore; Massimo Gurioli

• Book ID: 103882095
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 696 KB
• Volume: 8
• Category: Article
• ISSN: 1569-4410
• DOI: 10.1016/j.photonics.2009.08.004

✦ Synopsis

In this work we present a sizeable and reversible spectral tuning of the resonances of a two-dimensional photonic crystal nanocavity by exploiting the introduction of a sub-wavelength size glass tip. The comparison between experimental near-field data and results of numerical calculations shows that the spectral shift induced by the tip is proportional to the local electric field intensity of the cavity mode. This observation proves that the electromagnetic local density of states in a microcavity can be directly measured by mapping the tip-induced spectral shift with a scanning near-field optical microscope. Moreover, a non-linear control on the cavity resonance is obtained by exploiting the local heating induced by near-field laser excitation at different excitation powers. The temperature gradient due to the optical absorption results in an index of refraction gradient which modifies the dielectric surroundings of the cavity and shifts the optical modes.