Chiral sensing is essential for comprehending biological processes. Our study emphasizes the use of Metallic Helical structures (MHCs) in Surface-Enhanced Raman Spectroscopy (SERS). The double helices, fabricated by TPL method reveal exhibit high SERS response (approximately 1014 EF) in simulation. This facilitates the detection of both chiral and non-chiral molecules.
Antimony trisulfide (Sb2S3) is an Earth abundant material that is transparent to visible and near infrared light (N-IR). Switching the material between amorphous and crystalline states causes radical property changes that deem it useful for programming the response of visible and N-IR photonics devices. We have demonstrated how Sb2S3 can be used to program high resolution micro-displays, dielectric metasurfaces, hyperbolic metamaterials, waveguides, and all-optical neural networks. This presentation will discuss these demonstrations and the underlying physics responsible for the phase transition in Sb2S3.
The novelty in structural colors arise from recent discovery that individual elements are capable of generating a wide range of colors, instead of the use of repeated units. Here, we discuss basic structures 3D printed using two-photon polymerization lithography (TPL) to investigate new mechanisms for generating colors. Such structures enable new approaches to fully 3D print optical devices that previously rely on precise mechanical assembly, e.g. high-resolution lightfield prints. Structures printed using in-house shape memory polymer resin or elastomers allow for reconfigurable micro-prints that exhibit unique behavior under compressive and tensile stress.
I will present an overview of our recent work on structural color printing using plasmonic resonances, dielectric nanoantennas, and photonic crystals. Using a wide range of materials from metals to dielectrics and nanostructuring them with tools such as electron beam lithography and two-photon photopolymerization lithography results in interesting light-matter interactions. In addition to generating colors these techniques have allowed simultaneous phase control for multi-color holography, with promising applications in anti-counterfeiting, optical data archival, and spectral selective detectors.
Chalcogenides are materials that substantially consist of sulphur, selenium, and tellurium. Their dielectric properties
can be tuned by thermally induced structural phase transitions, photostructural transitions, and dissolution
of metal dopants. We have designed active photonic structures using a range of `tuneable' chalcogenides. The
resonant frequency of plasmonic structures was tuned over a 100 nm band in the visible, metal-chalcogenidemetal
structures provide tuning of over a band of 0.5 μm in the mid-infrared, and hyperbolic metamaterials
incorporating chalcogenides provide a means to alter the radiative decay rate of
uorescent photons.
Block copolymers have been proposed for self-assembled nanolithography because they can spontaneously form
well-ordered nanoscale periodic patterns of lines or dots in a rapid, low-cost process. By templating the selfassembly,
patterns of increasing complexity can be generated, for example arrays of lines with bends or
junctions. This offers the possibility of using a sparse template, written by electron-beam lithography or other
means, to organize a dense array of nanoscale features. Pattern transfer is simplified if one block is etch resistant
and one easily removable, and in this work we use a diblock copolymer or a triblock terpolymer with one Sicontaining
block such as polydimethylsiloxane or polyferrocenylsilane, and one or two organic blocks such as
polystyrene or polyisoprene. Removal of the organic block(s) with an oxygen plasma leaves a pattern of Sicontaining
material which can be used as an etch mask for subsequent pattern transfer to make metallization lines
or magnetic nanostructures with feature sizes below 10 nm and periodicity below 20 nm.
Superconducting nanowire single photon detectors have recently been demonstrated as viable candidates for photon-counting
optical receivers operating at data rates in excess of 100 Mbit/s. In this paper, we discuss techniques for
extending these data rates to rates > 1 Gbit/s. We report on a recent demonstration of a 2-element nanowire detector
array operating at a source data rate of 1.25 Gbit/s. We also describe techniques for emulating larger arrays of detectors
using a single detector. We use these techniques to demonstrate photon-counting receiver operation at data rates from
780-Mbit/s to 2.5 Gbit/s with sensitivities ranging from 1.1 to 7.1 incident photons per bit.
The sensitivity of a high-rate photon-counting optical communications link depends on the performance of the photon counter used to detect the optical signal. In this paper, we focus on ways to reduce the effect of blocking, which is loss due to time periods in which the photon counter is inactive following a preceding detection event. This blocking loss can be reduced by using an array of photon counting detectors or by using photon counters with a shorter inactive period. Both of these techniques for reducing the blocking loss can be employed by using a multi-element superconducting nanowire single-photon detector. Two-element superconducting nanowire single-photon detectors are used to demonstrate error-free photon counting optical communication at data rates of 781 Mbit/s and 1.25 Gbit/s.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.