Details

Autor(en) / Beteiligte

• Kitano, K.
• Ishizaki, K.
• Gondaira, K.
• Tanaka, Y.
• Noda, S.

Titel

Light propagation in ultra-thin gap in 3D photonic crystals

Ist Teil von

• Photonics and nanostructures, 2017-05, Vol.24, p.58-62

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •We investigate introducing an ultra-thin gap into 3D photonic crystals as optical distribution.•Light propagation along ultra-thin gap introduced into a 3D photonic crystal has experimentally demonstrated.•Property of an ultra-thin gap is numerically revealed.•Corroboration between experimental and analytical findings shows validity. We investigate the propagation of light in an ultra-thin gap in stacked-stripe three-dimensional (3D) photonic crystals operating in the near-infrared wavelength range. We fabricate 3D photonic crystals composed of 32 stacked layers with an artificially introduced gap (∼200nm) in the center of the structure by using a wafer bonding method. In order to study the characteristics of the gap, we introduce oblique waveguides to connect the gap with the upper and lower sides of the photonic crystal. The observation of light output from waveguides that are distant from the waveguide used for incident light demonstrates for the first time that light propagates along the air gap and is distributed to multiple output waveguides. Moreover, we perform calculations that reveal the formation of a propagation mode resulting from introduction of the ultra-thin gap. We analyze the coupling between the propagation mode and the oblique waveguide mode and discuss the characteristics of light distribution via the gap.