Adjoint-based optimization of active nanophotonic devices

Nanophotonic Devices Based on Semiconductor Quantum Nanostructures

In this study, our recent research activities on nanophotonic devices with semiconductor quantum nanostructures are reviewed. We have developed a technique for nanofabricating of high-quality and high-density semiconductor quantum dots (QDs). On the basis of this core technology, we have studied next-generation nanophotonic devices fabricated using high-quality QDs, including (1) a high-perform...

Towards Adjoint Based Constrained Optimization

Nanowire-based plasmonic waveguides and devices for integrated nanophotonic circuits

The fast development of plasmonics have greatly advanced our understanding to the abundant phenomena related to surface plamon polaritons (SPPs) and improved our ability to manipulate light at the nanometer scale. With tightly confi ned local fi eld, SPPs can be transmitted in waveguides of subwavelength dimensions. Nanophotonic circuits built with plasmonic elements can be scaled down to dimen...

Frequency domain modeling of nanophotonic devices

Several problems in nanophotonics are uniquely suitable for frequency domain modeling methods. We first present a new method for sensitivity analysis of nanophotonic devices. The algorithm is based on the finitedifference frequency-domain method and uses the adjoint variable method and perturbation theory techniques. We show that our method is highly efficient and accurate and can be applied to...

Adjoint-based Methodology for Time-Dependent Optimization

This paper presents a discrete adjoint method for a broad class of time-dependent optimization problems. The time-dependent adjoint equations are derived in terms of the discrete residual of an arbitrary finite volume scheme which approximates unsteady conservation law equations. Although only the 2-D unsteady Euler equations are considered in the present analysis, this time-dependent adjoint m...