Alexander Y. Piggott

Inverse design and demonstration of a compact and broadband on-chip wavelength demultiplexer

An on-chip integrated wavelength demultiplexer designed using an inverse computational algorithm is experimentally demonstrated. 1,300 and 1,550 nm wavelength light is sorted in a device area of just 2.8 × 2.8 μm2.

Direct Bandgap Light Emission from Strained Germanium Nanowires Coupled with High-Q Nanophotonic Cavities

A silicon-compatible light source is the final missing piece for completing high-speed, low-power on-chip optical interconnects. In this paper, we present a germanium nanowire light emitter that encompasses all the aspects of potential low-threshold lasers: highly strained germanium gain medium, strain-induced pseudoheterostructure, and high-Q nanophotonic cavity. Our nanowire structure presents greatly enhanced photoluminescence into cavity modes with measured quality factors of up to 2000. By varying the dimensions of the germanium nanowire, we tune the emission wavelength over more than 400 nm with a single lithography step. We find reduced optical loss in optical cavities formed with germanium under high (>2.3%) tensile strain. Our compact, high-strain cavities open up new possibilities for low-threshold germanium-based lasers for on-chip optical interconnects.

Nonclassical higher-order photon correlations with a quantum dot strongly coupled to a photonic-crystal nanocavity

We use the third- and fourth-order autocorrelation functions

Fabrication-constrained nanophotonic inverse design

g^{(3)}(\tau_1,\tau_2)

Self-homodyne measurement of a dynamic Mollow triplet in the solid state

and

Photo-oxidative tuning of individual and coupled GaAs photonic crystal cavities

g^{(4)}(\tau_1,\tau_2, \tau_3)

Fully-automated optimization of grating couplers

to detect the non-classical character of the light transmitted through a photonic-crystal nanocavity containing a strongly-coupled quantum dot probed with a train of coherent light pulses. We contrast the value of

Inverse Design and Demonstration of a Compact on-Chip Narrowband Three-Channel Wavelength Demultiplexer

g^{(3)}(0, 0)

Inverse design and implementation of a wavelength demultiplexing grating coupler

with the conventionally used

Inverse design in nanophotonics

g^{(2)}(0)