Mid-infrared Electro-Optic Modulation in Few-layer Black Phosphorus

Abstract

Black phosphorus stands out from the family of two-dimensional materials as a semiconductor with a direct, layer-dependent bandgap in energy corresponding to the spectral range from the visible to the mid-infrared (mid-IR), as well as many other attractive optoelectronic attributes. It is, therefore, a very promising material for various optoelectronic applications, particularly in the important mid-IR range. While mid-IR technology has been advancing rapidly, both photodetection and electro-optic modulation in the mid-IR rely on narrow-band compound semiconductors, which are difficult and expensive to integrate with the ubiquitous silicon photonics. For mid-IR photodetection, black phosphorus has been proven to be a viable alternative. Here, we demonstrate electro-optic modulation of mid-IR absorption in few-layer black phosphorus under field applied by an electrostatic gate. Our experimental and theoretical results find that, within the doping range obtainable in our samples, the quantum confined Franz-Keldysh effect is the dominant mechanism of electro-optic modulation. Spectroscopic study on samples with varying thickness reveals strong layer-dependence in the inter-band transition between different sub-bands. Our results show black phosphorus is a very promising material to realizing efficient mid-IR modulators.

References in corpus (25)

• Van der Waals heterostructures
• Black phosphorus field-effect transistors
• Boron nitride substrates for high-quality graphene electronics
• High-mobility transport anisotropy and linear dichroism in few-layer black phosphorus
• Ultrafast graphene photodetector
• Two-Dimensional Material Nanophotonics
• Graphene photodetectors for high-speed optical communications
• Effective Passivation of Exfoliated Black Phosphorus Transistors against Ambient Degradation
• The Renaissance of Black Phosphorus
• Broadband Linear-Dichroic Photodetector in a Black Phosphorus Vertical p-n Junction
• Observation of tunable bandgap and anisotropic Dirac semimetal state in black phosphorus
• Waveguide-integrated black phosphorus photodetector with high responsivity and low dark current
• CMOS-compatible graphene photodetector covering all optical communication bands
• Direct Observation of Layer-Dependent Electronic Structure in Phosphorene
• Black Phosphorus Mid-Infrared Photodetectors with High Gain
• Tunable optical properties of multilayers black phosphorus thin films
• A black phosphorus photo-detector for multispectral, high-resolution imaging
• Degradation of Black Phosphorus (BP): The Role of Oxygen and Water
• Efficient Electrical Control of Thin-Film Black Phosphorus Bandgap
• Atomically thin quantum light emitting diodes
• Infrared fingerprints of few-layer black phosphorus
• Multifunctional graphene optical modulator and photodetector integrated on silicon waveguides
• Multilayer black phosphorus as a versatile mid-infrared electro-optic material
• High-speed waveguide-coupled graphene-on-graphene optical modulators
• Field Effect Optoelectronic Modulation of Quantum-Confined Carriers in Black Phosphorus

Cited by in corpus (15)

• Atomically thin quantum light emitting diodes
• Fabrication methods for integrating 2D materials
• Programmable black phosphorus image sensor for broadband optoelectronic edge computing
• Tuning 2D hyperbolic plasmons in black phosphorus
• Anisotropic Acoustic Plasmons in Black Phosphorus
• Opportunities in Electrically Tunable 2D Materials Beyond Graphene: Recent Progress and Future Outlook
• Tunable intraband optical conductivity and polarization-dependent epsilon-near-zero behavior in black phosphorus
• Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus
• Optical conductivity of black phosphorus with a tunable electronic structure
• Twisted two-dimensional material stacks for polarization optics
• Electronic structure of few-layer black phosphorus from $\mu$-ARPES
• Signatures of sub-band excitons in few-layer black phosphorus
• Layer-dependent exciton polarizability and the brightening of dark excitons in few-layer black phosphorus
• Electronic and transport properties of anisotropic semiconductor quantum wires
• Some coordinate transformations relevant to refractive indices