Exploring the Slow Light Features of Lattice Shifted Twist Induced Photonic Crystal Waveguides with Ring Like Holes

Abstract

In this paper, slow light features of an engineered photonic crystal waveguide are presented. The combined effect of lattice shift, lattice twist and introduction of ring-like holes (rings) in the innermost rows on the slow light features is studied. The rings are introduced in the first and second innermost rows of the waveguide. Slow light is characterized by calculating group index, second and fourth-order dispersions, and delay-bandwidth products. MIT Photonic Bands software is used for simulation. With rings in the innermost rows, a flat band of 17.71 nm is observed with a group index value of 12.72 and a flat band of 40.16 nm with a group index of 7.77. The normalized delay bandwidth product (NDBP) is observed as 0.1378 in the first structure and 0.1874 in the second structure with the proposed effects. These values are nearly 4.3 times higher in comparison with the NDBP value of the base structure (0.0436) and approximately 2 times higher than the engineered structure (0.0927). These structures are useful in slow light applications.

KEYWORDS:

• Dispersion engineering
• Engineered waveguides
• Flat band structures
• Optical buffer
• Photonic crystal waveguide
• Slow light

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work is funded by the Department of Science and Technology, Government of India (DST GoI) through INSPIRE fellowship (IF160435). Authors sincerely thank and acknowledge DST GoI for the same.

Notes on contributors

Vadapalli Durga Rama Pavan

Vadapalli Durga Rama Pavan was born in Nagaram, Andhra Pradesh, India on March 1991. He received his BSc and MSc Tech degrees in physics and engineering physics from Andhra University, Visakhapatnam and NIT Warangal, in 2011 and 2014, respectively. He is currently pursuing his PhD degree at the National Institute of Technology, Warangal, as an INSPIRE fellow under the Department of Science and Technology (Government of India). His current research interests are in the area of photonic crystal structures, fiber optic sensors, and optical system design. Email: [email protected]

Sourabh Roy

Sourabh Roy was born in Dakshin Dinajpur, West Bengal, India on February 1982. He received the BSc, MSc and PhD degrees in physics from North Bengal University, West Bengal and Indian Institute of Technology Kharagpur, India, in 2002, 2004 and 2010, respectively. He then pursued postdoctoral research at the CNIT & University of Padova, Italy as a post-doctoral researcher under the project EU-FP7 Governing the Speed of Light (GOSPEL). In 2012, he joined as the faculty in physics at NIT Warangal, where he is currently working as an associate professor. He is the author/co-author of over 25 research papers. His areas of interest are photonic crystals, nonlinear optics, fiber Bragg grating sensors, photonic devices and sensors. Dr Roy is also an active member and faculty advisor for the SPIE student chapter at NIT Warangal.