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High-purity orbital angular momentum states from a visible metasurface laser

Journal Article

A metasurface laser generates orbital angular momentum states with quantum numbers reaching l = 100. Simultaneous output vortex beams, with Delta l as great as 90, are demonstrated in the visible regime. Orbital angular momentum (OAM) from lasers holds...

Ultrahigh Angular Selectivity of Disorder-Engineered Metasurfaces

Journal Article

Metastructures hold promises for the realization of novel optical functions. Common topologies utilized in the form of metasurfaces featuring simple periodicities, however, are not exploiting the full potential such platform can offer. On the other hand...

In-Phase and Anti Phase Synchronization in a Laser Frequency Comb

Journal Article

Coupled clocks are a classic example of a synchronization system leading to periodic collective oscillations. Already in 1665, Christiaan Huygens described this phenomenon as a kind of ``sympathy'' among oscillators. In this work, we describe the...

All-Glass, Large Metalens at Visible Wavelength Using Deep-Ultraviolet Projection Lithography

Journal Article

Metalenses, planar lenses realized by placing subwavelength nanostructures that locally impart lenslike phase shifts to the incident light, are promising as a replacement for refractive optics for their ultrathin, lightweight, and tailorable...

Widely tunable compact terahertz gas lasers

Journal Article

The terahertz region of the electromagnetic spectrum has been the least utilized owing to inadequacies of available sources. We introduce a compact, widely frequency-tunable, extremely bright source of terahertz radiation: a gas-phase molecular laser...

Compact single-shot metalens depth sensors inspired by eyes of jumping spiders

Journal Article

Jumping spiders (Salticidae) rely on accurate depth perception for predation and navigation. They accomplish depth perception, despite their tiny brains, by using specialized optics. Each principal eye includes a multitiered retina that simultaneously...

Light and Microwaves in Laser Frequency Combs: An Interplay of Spatiotemporal Phenomena

Journal Article

Interference of laser beams in a suitable medium creates dynamic optical gratings, which can serve for a wide variety of applications, ranging from real-time holography to ultrasound generation. Typically, the interference occurs in a sample material that...

Dielectric multi-momentum meta-transformer in the visible

Journal Article

Metasurfaces as artificially nanostructured interfaces hold significant potential for multifunctionality, which may play a pivotal role in the next-generation compact nano-devices. The majority of multi-tasked metasurfaces encode or encrypt multi...

Using the Belinfante momentum to retrieve the polarization state of light inside waveguides

Journal Article

Current day high speed optical communication systems employ photonic circuits using platforms such as silicon photonics. In these systems, the polarization state of light drifts due to effects such as polarization mode dispersion and nonlinear phenomena...

Polariton nanophotonics using phase-change materials

Journal Article

Polaritons formed by the coupling of light and material excitations enable light-matter interactions at the nanoscale beyond what is currently possible with conventional optics. However, novel techniques are required to control the propagation of...

Matrix Fourier optics enables a compact full-Stokes polarization camera

Journal Article

Recent developments have enabled the practical realization of optical elements in which the polarization of light may vary spatially. We present an extension of Fourier optics-matrix Fourier optics-for understanding these devices and apply it to the...

Compact Aberration-Corrected Spectrometers in the Visible Using Dispersion-Tailored Metasurfaces

Journal Article

The spectral resolution and range of conventional spectrometers are typically limited by optical aberrations of their focusing elements, mainly due to chromatically induced astigmatism and an intrinsically curved focal plane. Traditional approaches to...