Optics at the nanoscale: physics, devices and applications

Visible to long-wave infrared chip-scale spectrometers based on photodetectors with tailored responsivities and multispectral filters

Jasper J Cadusch, Jiajun Meng, Benjamin J Craig, Vivek Raj Shrestha, Kenneth B Crozier

2020-09-01

Chip-scale microspectrometers, operational across the visible to long-wave infrared spectral region will enable many remote sensin..

Metasurface with metallic nanoantennas and graphene nanoslits for sensing of protein monolayers and sub-monolayers

M Ye, KB Crozier

2020-06-08

Biomolecule sensing plays an important role in both fundamental biological studies and medical diagnostic applications. Infrared (..

Mid- to long-wave infrared computational spectroscopy with a graphene metasurface modulator.

Vivek Raj Shrestha, Benjamin Craig, Jiajun Meng, James Bullock, Ali Javey, Kenneth B Crozier

2020-03-25

In recent years there has been much interest concerning the development of modulators in the mid- to long-wave infrared, based on ..

Long-wave infrared magnetic mirror based on Mie resonators on conductive substrate

Ming Ye, Shi-Qiang Li, Yang Gao, Kenneth B Crozier

2020-01-20

Metal films are often used in optoelectronic devices as mirrors and/or electrical contacts. In many such devices, however, the π-p..

Algorithmic approach for designing plasmonic nanotweezers

Neuton Li, Jasper Cadusch, Kenneth Crozier

2019-11-01

We use machine learning (simulated annealing) to design plasmonic nanoapertures that function as optical nanotweezers. The nanoape..

Mid- to long-wave infrared computational spectroscopy using a subwavelength coaxial aperture array

Benjamin J Craig, Jiajun Meng, Vivek Raj Shrestha, Jasper J Cadusch, Kenneth B Crozier

2019-09-19

Miniaturized spectrometers are advantageous for many applications and can be achieved by what we term the filter-array detector-ar..

Quo vadis, plasmonic optical tweezers?

Kenneth B Crozier

2019-04-03

Conventional optical tweezers based on traditional optical microscopes are subject to the diffraction limit, making the precise tr..

Vertical Ge-Si Nanowires with Suspended Graphene Top Contacts as Dynamically Tunable Multispectral Photodetectors

Shi Qiang Li, Amit Solanki, Jacopo Frigerio, Daniel Chrastina, Giovanni Isella, Changxi Zheng, Arman Ahnood, Kumaravelu Ganesan, Kenneth B Crozier

2019-03-20

Numerous applications would be enabled by pixels for multispectral imaging whose spectral responses can be dynamically tuned and t..

Controlling the Light Absorption in a Photodetector Via Nanowire Waveguide Resonances for Multispectral and Color Imaging

Kenneth B Crozier, Kwanyong Seo, Hyunsung Park, Amit Solanki, Shi-Qiang Li

2018-11-01

The responsivity spectrum of a photodetector is one of its key specifications. It ultimately originates from the combination of th..

Polarization-resolved black phosphorus/molybdenum disulfide mid-wave infrared photodiodes with high detectivity at room temperature

James Bullock, Matin Amani, Joy Cho, Yu-Ze Chen, Geun Ho Ahn, Valerio Adinolfi, Vivek Raj Shrestha, Yang Gao, Kenneth B Crozier, Yu-Lun Chueh, Ali Javey

2018-10-01

Infrared photodetectors are currently subject to a rapidly expanding application space, with an increasing demand for compact, sen..

Experimental demonstration of infrared spectral reconstruction using plasmonic metasurfaces

Benjamin Craig, Vivek Raj Shrestha, Jiajun Meng, Jasper J Cadusch, Kenneth B Crozier

2018-09-15

We computationally reconstruct short- to long-wave infrared spectra using an array of plasmonic metasurface filters. We illuminate..

Controlled optical trapping and transport of a single 100 nm particle across an array of silicon nanoantennas

Z Xu, KB Crozier

2018-08-06

We experimentally demonstrate the optical trapping and transport of a single 100 nm polystyrene nanosphere across an array of sili..

Nanostructured Fishnet Silicon Photodetector Pixels as a Fully-Contained Microspectrometer Chip

JJ Cadusch, J Meng, KB Crozier

2018-08-06

Direct Particle Tracking Observation and Brownian Dynamics Simulations of a Single Nanoparticle Optically Trapped by a Plasmonic Nanoaperture

Zhe Xu, Wuzhou Song, Kenneth B Crozier

2018-07-01

Optical trapping using plasmonic nanoapertures has proven to be an effective means for the contactless manipulation of nanometer-s..

Origin of the anapole condition as revealed by a simple expansion beyond the toroidal multipole

Shi-Qiang Li, Kenneth B Crozier

2018-06-25

Toroidal multipoles are a topic of increasing interest in the nanophotonics and metamaterials communities. In this paper, we separ..

Generalized Method of Images and Reflective Color Generation from Ultrathin Multipole Resonators

Shi-Qiang Li, Wuzhou Song, Ming Ye, Kenneth B Crozier

2018-06-01

The multipole expansion has found limited applicability for optical dielectric resonators in inhomogeneous environment, such as on..

Harnessing the Interplay between Photonic Resonances and Carrier Extraction for Narrowband Germanium Nanowire Photodetectors Spanning the Visible to Infrared

Amit Solanki, Shiqiang Li, Hyunsung Park, Kenneth B Crozier

2018-02-01

At visible wavelengths, photodetection in three channels (red, green, and blue) enables color imaging. Yet the spectra of most mat..

Electrical tuning of reflectance of graphene metasurface for unpolarized long wavelength infrared light

VR Shrestha, Y Gao, M Amani, J Bullock, A Javey, KB Crozier

2018-01-01

We demonstrate a graphene-metal metasurface for unpolarized long wavelength infrared light with electrically-tunable reflectance. ..

Experimental Demonstration of Mid-Infrared Computational Spectroscopy with a Plasmonic Filter Array

Benjamin Craig, Vivek Raj Shrestha, Jiajun Meng, Kenneth B Crozier

2018-01-01

We demonstrate mid-infrared plasmonic filters. We experimentally determine the spectrum of a mid-infrared light source using an al..

Mid-infrared Magnetic Mirror Based on a Hybrid Metal/Dielectric Metasurface

Ming Ye, Shiqiang Li, Yang Gao, Vivek Raj Shrestha, Kenneth B Crozier

2018-01-01

We propose a hybrid metal/dielectric metasurface that functions as a mid-infrared magnetic mirror. It consists amorphous silicon c..

Optical trapping using all-dielectric silicon nanoantennas with ultra-low heat generation

Z Xu, W Song, KB Crozier

2017-10-25

Silicon nanoantennas are used to trap polystyrene nanospheres (20 nm diameter). Fluorescence microscopy is used to monitor trapped..

Beyond Toroidal Multipoles

Shi-Qiang Li, Kenneth B Crozier

2017-01-01

We propose to separate out the toroidal multipoles in the polar coordinates that is simpler than previous methods done in the Cart..

Direct observation of optical trapping of a single quantum dot with an all-silicon nanoantenna

Z Xu, W Song, KB Crozier

2017-01-01

Silicon nanoantennas are used to optically trap individual streptavidin-coated CdSe/ZnS quantum dots (QDs) with minimal thermal ef..

Plasmonic filter arrays for infrared spectral reconstruction

B Craig, VR Shrestha, J Meng, KB Crozier

2017-01-01

We experimentally demonstrate an array of plasmonic infrared transmission filters. We show, by simulations that include noise, rec..

Trapping nanoparticles with plasmonic and photonic nanostructures

Kenneth B Crozier

2017-01-01

We describe optical trapping with plasmonics and with silicon photonics. We furthermore describe recent work in which fluorescence..

Wavelength-Multiplexed Spectrometer Based on Silicon Nanowire Photodetector Array

Jiajun Meng, Shiqiang Liand, Kenneth B Crozier

2017-01-01

High-performance silicon nanowire bipolar phototransistors

SL Tan, X Zhao, K Chen, KB Crozier, Y Dan

2016-07-18

Silicon nanowires (SiNWs) have emerged as sensitive absorbing materials for photodetection at wavelengths ranging from ultraviolet..

Quantum mechanical effects in plasmonic structures with subnanometre gaps

Wenqi Zhu, Ruben Esteban, Andrei G Borisov, Jeremy J Baumberg, Peter Nordlander, Henri J Lezec, Javier Aizpurua, Kenneth B Crozier

2016-06-01

Metallic structures with nanogap features have proven highly effective as building blocks for plasmonic systems, as they can provi..

Vividly-colored silicon metasurface based on collective electric and magnetic resonances

W Song, S Li, KB Crozier

2016-01-07

We fabricate a silicon nanorod-based metasurface that shows vivid colors. Each nanorod supports electric and magnetic dipole modes..

Highly Directional Fluorescent Emission at Visible Wavelengths with a Silicon Metasurface

W Song, S LI, K Crozier

2016-01-01

We experimentally demonstrate, for the first time to our knowledge, highly-directional fluorescence emission at visible wavelength..

Isolated and Collective Magnetic Resonances in Dielectric Nanoparticles at Optical Frequencies

S LI, W Song, K Crozier

2016-01-01

We employ multipole expansion to analyze radiation modification and light scattering by isolated nanoparticles and by nanoparticle..

Optical tracking of a nanoparticle trapped by a double nanohole aperture

Zhe Xu, Wuzhou Song, Kenneth B Crozier

2016-01-01

A double nanohole aperture in a gold film is used to trap a polytyrene nanosphere with a diameter of 20 nm. Fluorescence microscop..

Optical Trapping with Plasmonic and Photonic Nanostructures

Kenneth B Crozier

2016-01-01

Plasmonic Nanoantennas with Sub-nanometer Gaps: Fabrication and Observation of Quantum Mechanical Effects

Kenneth B Crozier

2016-01-01

Vertical Germanium Nanowire Photodetectors with Suspended Graphene Top Contact

S LI, J Frigerio, D Chrastina, G Isella, A Solanki, W Song, C Zheng, KB Crozier

2016-01-01

We demonstrate photodetectors for visible-to-infrared imaging, comprising vertical germanium nanowires on a silicon substrate, wit..

Sensing pH in a microfluidic channel with a lab-on-a-smartphone fluorescence spectrometer

J Chen, R Wang, A Renganathan, A Rattan, X Meng, RR Unnithan, KB Crozier

2014-07-21

We demonstrate a smartphone unit for measuring pH. The dye-mixed sample is input to a microfluidic chip and inserted into the unit..