Miguel Navarro-Cia

Miguel Navarro-Cia
University of Birmingham · School of Physics and Astronomy

MEng, MRes, PhD in Engineering

About

284
Publications
34,528
Reads
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3,558
Citations
Introduction
I received the MEng and Ph.D. in Telecommunication Engineering and a MRes in 'Introduction to Research in Comms' from Universidad Pública de Navarra, Spain. I am currently a Reader jointly with the School of Physics and Astronomy, and the School of Engineering at University of Birmingham, and I am also affiliated with Imperial College London and University College London as a Visiting Researcher. My research interests are metamaterials, plasmonics, FSS, and THz science and technology.
Additional affiliations
August 2019 - July 2021
University of Birmingham
Position
  • Senior Lecturer
December 2015 - November 2020
University of Birmingham
Position
  • Birmingham Fellow
December 2012 - November 2015
Imperial College London
Position
  • Imperial College Junior Research Fellow
Education
October 2017 - December 2018
University of Birmingham
Field of study
  • Postgraduate Certificate in Higher Education
September 2006 - October 2007
Universidad Pública de Navarra
Field of study
  • Introduction to Communication Research
September 2006 - April 2010
Universidad Pública de Navarra
Field of study
  • Extraordinary transmission and geometrically-induced modes for metamaterials: from underlying physics to technological applications

Publications

Publications (284)
Article
Full-text available
A range of the distinctive physical properties, comprising high surface-to-volume ratio, possibility to achieve mechanical and chemical stability after a tailored treatment, controlled quantum confinement and the room-temperature photoluminescence, combined with mass production capabilities offer porous silicon unmatched capabilities required for t...
Article
The terahertz (0.1–10 THz) range represents a fast-evolving research and industrial field. The great interest for this portion of the electromagnetic spectrum, which lies between the photonics and the electronics ranges, stems from the unique and disruptive sectors where this radiation finds applications in, such as spectroscopy, quantum electronic...
Article
We present an all-dielectric chiral photonic crystal that guides the propagation of electromagnetic waves without backscattering for dual bands. The chiral photonic crystal unit cell is composed of four dielectric cylinders with increasing inner diameter clockwise or anticlockwise, which leads to chirality. It is demonstrated that the proposed chir...
Article
Full-text available
For one-dimensional (1D) topological insulators, the edge states always reside in the bulk bandgaps as isolated modes. The emergence and vanishing of these topological edge states are always associated with the closing/reopening of the bulk bandgap and changes in topological invariants. In this work, we discover a special kind of edge state in a 1D...
Article
Full-text available
We present the numerical, theoretical, and experimental study of a terahertz metasurface supporting a pseudo-anapole. Pseudo-anapole effect arises when electric and toroidal dipole moments both tend to a minimum, instead of destructive interference between electric and toroidal dipole moments in conventional anapole mode. Such overlap allows resona...
Conference Paper
The realisation of hyperspectral terahertz imaging is a signi�cant step towards understanding of the life sciences on all scales. A key to this understanding is the retrieval of dielectric properties from such images, a task which is plagued by experimental limitations, challenging the terahertz community for more than two decades. In this contribu...
Article
Full-text available
Terahertz imaging is becoming a biological imaging modality in its own right, alongside the more mature infrared and X-ray techniques. Nevertheless, extraction of hyperspectral, biometric information of samples is limited by experimental challenges. Terahertz time domain spectroscopy reflection measurements demand highly precise alignment and suffe...
Article
Full-text available
This study explores the scattering of signals within the mm and low Terahertz frequency range, represented by frequencies 79 GHz, 150 GHz, 300 GHz, and 670 GHz, from surfaces with different roughness, to demonstrate advantages of low THz radar for surface discrimination for automotive sensing. The responses of four test surfaces of different roughn...
Article
Topological insulator nanoparticles (TINPs) host topologically protected Dirac surface states, just like their bulk counterparts. For TINPs of radius <100 nm, quantum confinement on the surface results in the discretization of the Dirac cone. This system of discrete energy levels is referred to as a topological quantum dot (TQD) with energy level s...
Article
Full-text available
To undertake THz spectroscopy and imaging, and accurately design and predict the performance of quasi-optical components, knowledge of the parameters of the beam (ideally Gaussian) emitted from a THz source is paramount. Despite its proliferation, relatively little work has been done on this in the frame of broadband THz photoconductive antennas. U...
Preprint
Full-text available
Extraordinarily transmitting arrays are promising candidates for quasi-optical (QO) components due to their high frequency selectivity and beam scanning capabilities owing to the leaky-wave mechanism involved. We show here how by breaking certain unit cell and lattice symmetries, one can achieve a rich family of transmission resonances associated w...
Article
The recent ability of plasmonic nanostructures to probe sub-nanometer and even atomic scales demands theories that can account for the nonlocal dynamics of the electron gas. The hydrodynamic Drude model (HDM) captures much of the microscopic dynamics of the quantum mechanical effects when additional boundary conditions are considered. Here, we revi...
Article
Full-text available
Extraordinarily transmitting arrays are promising candidates for quasi-optical (QO) components due to their high frequency selectivity and beam scanning capabilities owing to the leaky-wave mechanism involved. We show here how by breaking certain unit cell and lattice symmetries, one can achieve a rich family of transmission resonances associated w...
Article
Pulse-shaping is important for communications, spectroscopy and other applications that require high peak power and pulsed operation, such as radar systems. Unfortunately, pulse-shaping remains largely elusive for terahertz (THz) frequencies. To address this void, a comprehensive study on the dispersion tunability properties of THz chirped pulses t...
Article
Full-text available
Transmission through seemingly opaque surfaces, so-called extraordinary transmission, provides an exciting platform for strong light-matter interaction, spectroscopy, optical trapping, and color filtering. Much of the effort has been devoted to understanding and exploiting TM extraordinary transmission, while TE anomalous extraordinary transmission...
Article
The hydrothermal method is the most effective approach for the synthesis of VO2 metastable polymorphes with unique powder crystallites morphology. In this work, we expanded the capabilities of this method, directing it to the growth of oriented crystallites in self-organized systems on the single crystal substrates. According to our investigations,...
Article
Full-text available
Plasmonic nanoantennas have revolutionized the way we study and modulate light–matter interaction. Due to nanofabrication limitations, dimer-type nanoantennas always exhibit some degree of asymmetry, which is desirable in some cases. For instance, in sensing applications, asymmetry is sometimes induced by design in plasmonic nanoantennas to favor h...
Conference Paper
Full-text available
Metallic nanoparticles exert a strong influence on the electrodynamics and mechanical dynamics of nanoemitters in their vicinity. Transformation optics can provide analytical descriptions and physical insight on these scenarios. As a case of study, we discuss the use of conformal transformation to understand the nonradiative Purcell enhancement and...
Article
Full-text available
Weyl points are discrete locations in the three-dimensional momentum space where two bands cross linearly with each other. They serve as the monopoles of Berry curvature in the momentum space, and their existence requires breaking of either time-reversal or inversion symmetry1–16. Although various non-centrosymmetric Weyl systems have been reported...
Article
Symmetries play an important role in many branches of physics and enable simplification of the mathematical description of problems. In some cases, symmetries are hidden and are only evident under suitable coordinate systems. With the help of conformal transformation, it is shown analytically here how asymmetric-looking plasmonics diabolo nanoanten...
Article
Reconfigurable antennas capable of beam-steering offer an efficient solution to optimize the use of the crowded wireless medium and can serve as a multifunction antenna. Beam-steering is often achieved by antenna geometry switching at the expense of hardware complexity. Here, polarization is used to realize beam-steering without the need of antenna...
Article
Full-text available
Despite three decades of effort, predicting accurately extraordinary transmission through subwavelength hole arrays has proven challenging. This lack of quantitative design and modelling able to take into account the inherent complexity of high frequency instrumentation has prevented the development of practical high-performance components based on...
Conference Paper
It is now well established that leaky-waves play a major role in the so-called extraordinary transmission (ET) phenomenon [1]. This knowledge has been used extensively for the design of Bull's Eye antennas - i.e., a feeding slot surrounded by corrugations - [2], but little effort has been directed so far to use it for the design and modelling of qu...
Conference Paper
Reconfigurability is becoming a hot topic in microwave engineering since it enables the integration of several functionalities into the same component. This ability will be indeed critical in wireless communication technologies that need to operate with a wide range of standards with enormously different frequency and bandwidth allocations. Reconfi...
Article
The terahertz (THz) dielectric constant (eps_r) and dielectric loss tangent (tan(d)) of the commercial LTCC materials (Ferro A6M and DuPont 951), Al2O3 (ceramic and single crystal), AlN and β-Si3N4 ceramics were measured using the vector network analyzer (VNA) over the frequency range of 140-220 GHz and the time-domain spectrometer (TDS) from 0.2 t...
Preprint
Full-text available
Topological insulators (TIs) present a neoteric class of materials, which support delocalised, conducting surface states despite an insulating bulk. Due to their intriguing electronic properties , their optical properties have received relatively less attention. Even less well studied is their behaviour in the nanoregime, with most studies thus far...
Preprint
Full-text available
Topological insulators (TIs) present a neoteric class of materials, which support delocalised, conducting surface states despite an insulating bulk. Due to their intriguing electronic properties, their optical properties have received relatively less attention. Even less well studied is their behaviour in the nanoregime, with most studies thus far...
Conference Paper
In recent years, the terahertz (THz) region of the electromagnetic spectrum, referring roughly to the frequencies from 0.1 to 10 THz, has attracted significant interest in materials science, communication and biomedical engineering 1. In electronic communication applications, multilayer ceramics technology (LTCC and HTCC) is considered as one of th...
Conference Paper
At the expense of frequency resolution, time-domain spectrometers provide access to the frequency range 0.2 to 3 THz in a continuous fashion, unlike vector network analysers that enable a banded solution up to 1.1 THz [1]. This broadband response can be exploited to obtain the performance of frequency selective surfaces at the design frequency and...
Conference Paper
Reconfigurability and tunability are a desirable feature to reduce the number of components in engineering systems. Lumped elements (e.g., PIN diodes, varactor diodes, RF_MEMS), tunable materials (e.g., liquid crystal, ferroelectric thin film, photo-conductive), and mechanical approaches are the standard strategies in agile microwave technology [1]...
Conference Paper
A band pass filter based on hollow circular waveguide loaded with axially periodic dielectric and gold rings is demonstrated for THz frequencies. The presence of coaxial gold rings can introduce the single mode operation due to a high rejection values at the both-sides of pass-band, and an acceptable confinement for the proposed structure. The pres...
Conference Paper
Reconfigurability will be a central theme in the next generation of microwave and millimeter-wave components. Reconfigurable or tuneable microwave devices, whose electromagnetic response can be changed on the fly, enable us to reduce complexity, size, weight, power consumption, and cost. The industry standard for such agile microwave technology rel...
Conference Paper
Given the increase of dielectric and conductive losses at THz frequencies (ca. 0.3-10 THz) compared to microwaves, THz technology has relied strongly on free-space quasi-optics (G. Carpintero et al., Semiconductor TeraHertz Technology: Devices and Systems at Room Temperature Operation, Wiley-IEEE Press, 2015). Hence, frequency selective surfaces (F...
Conference Paper
Driven by our data hungry society, chip-to-chip and device-to-device data bit rates will need to reach terabits per second in a not distant future. Such data rate will only be met if there is a shift from microwaves to millimeter-waves (ca. 30-300 GHz) or even Terahertz frequencies (ca. 0.3-1 THz) (G. Carpintero et al., Semiconductor TeraHertz Tech...
Article
Full-text available
Nanogaps supporting cavity plasmonic modes with unprecedented small mode volume are attractive platforms for tailoring the properties of light–matter interactions at the nanoscale and revealing new physics. Hitherto, there is a concerning lack of analytical solutions to break the complex interactions into the different underlying mechanisms to gain...
Article
Spin-orbit coupling of light, describing the interaction between the polarization (spin) and spatial degrees of freedom (orbit) of light, plays an important role in subwavelength scale systems and leads to many interesting phenomena, such as the spin Hall effect of light. Here, based on the spin-orbit coupling, we design and fabricate a helical tap...
Conference Paper
Current on-chip interconnect technology is not scalable to provide wide bandwidth beyond Gbps. It is well accepted that to achieve in the future terabit per second data rates, technology will need to migrate to terahertz frequencies (i.e., 0.1-3 THz) [1]. However, at such high frequencies the standard transmission lines display excessively large at...
Article
The discovery of extraordinary optical transmission (EOT) through patterned metallic foils in the late 1990s was decisive for the development of plasmonics and cleared the path to employ small apertures for a variety of interesting applications all along the electromagnetic spectrum. However, a typical drawback often found in practical EOT structur...
Poster
Full-text available
Overview of the metamaterial-inspired components, plasmonics and THz activities at University of Birmingham
Conference Paper
Reconfigurability will be a central theme in the next generation of microwave and millimetre-wave components. Reconfigurable or tuneable microwave devices, whose electromagnetic response can be changed on the fly, enable us to reduce complexity, size, weight, power consumption, and cost. The industry standard for such agile microwave technology rel...
Article
Full-text available
Nanoantennas enable the concentration and manipulation of light at the (sub-)nanoscale. This ability offers novel strategies to strengthen light-matter interactions in a controlled fashion. However, most nanoantennas are highly sensitive to light polarization and emitter orientation, which is disadvantageous for many applications (e.g., Raman and f...
Article
Full-text available
A 2-D periodic array of annular apertures (or ring slots) is studied using an accurate circuit model. The model accounts for distributed and dynamic effects associated with the excitation of high-order modes operating above or below cutoff but not far from their cutoff frequencies. This paper allows to ascertain the substantial differences of the u...
Conference Paper
Full-text available
Understanding and controlling the light-matter interaction is of fundamental importance for science and technology. Scenarios involving nanoemitters and nanoantennas are nowadays routinely measured in the lab. However, interpretation of the observations is not always straightforward. We will show here how conformal transformation can be used to pro...
Conference Paper
The hollow coaxial waveguide is an attractive transmission line for Terahertz (THz) pulses (i.e., signals with frequency content over a decade) because its fundamental transverse electromagnetic (TEM) mode is dispersionless. However, generating THz pulses with radial polarization to match the TEM mode has been proven challenging. The standard solut...
Conference Paper
Full-text available
Unlike neighbouring spectral regions, millimetre and submillimetre waves (i.e., Terahertz frequencies) have been proven to be difficult to generate and detect [1]. With the advent of metamaterials and metasurfaces, new venues to optimize emitters and detectors for such challenging radiation have been opened. We propose here a simple approach to tur...
Conference Paper
Full-text available
Low dispersion of single-cycle terahertz (THz) pulses can be achieved in very few hollow waveguides such as dielectric-lined and coaxial waveguides. The former has been widely investigated [1] because, among other reasons, the in-coupling is very efficient with typical THz emitters. Conversely, the fundamental mode of a coaxial waveguide, the trans...
Article
Reducing the profile, footprint and weight of antennas embarked on aircrafts, drones or satellites has been a long pursued objective. Here we tackle this issue by developing a millimeter-wave 96 GHz elliptical Bull’s-Eye antenna with off-axis radiation at 16.5º that has been fabricated by low cost 3D printing stereolithography, followed by metal co...