Abstract
We report on electro-optic modulation using a Lithium Niobate (LN) Photonic Crystal (PC) cavity structure. The compact device (6 μm in length) consists of a 2D photonic crystal cavity made on an Annealed Proton Exchange (APE) LN waveguide with vertical deposited electrodes. Experimental results show a tunability of 0.6 nm/V. This compact design opens a way towards micro and nano-scale tunable photonic devices with low driving electrical power.
Highlights
During the last 3 decades, there has been a great interest in photonic crystals (PCs) due to their ability to manipulate photons and to their potential applications in ultra-compact photonic devices [1, 2]
One additional step is achieved in this work towards the fabrication of a tunable, low-voltage and micrometric-sized electro-optic intensity modulator based on PC cavity
Annealed Proton Exchange (APE) Lithium Niobate (LN) waveguide was fabricated on a 500 μm thick X-cut LN wafer, which is sandwiched by a ridge waveguide as mentioned before
Summary
During the last 3 decades, there has been a great interest in photonic crystals (PCs) due to their ability to manipulate photons and to their potential applications in ultra-compact photonic devices [1, 2]. In the perspective of integrating dense optical circuits on smallscale, tunable PCs present special interest. They typically consist of a periodic lattice of air holes graved into a dielectric substrate in which the optical properties are modified alternatively by an external physical signal such as electric or magnetic field, temperature, strain, etc [5,6,7,8,9,10,11]. In the purpose of obtaining complex integrated photonic device such as ultra-compact, high speed and low power consumptions switches, modulators, etc., lithium niobate (LN) is a perfect candidate. One additional step is achieved in this work towards the fabrication of a tunable, low-voltage and micrometric-sized electro-optic intensity modulator based on PC cavity. Received 6 Jun 2012; revised 16 Jul 2012; accepted 31 Jul 2012; published 28 Aug 2012 10 September 2012 / Vol 20, No 19 / OPTICS EXPRESS 20885
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