209 citations · 1.5k across the 44 of their papers we have counts for
47 papers
Inverse-designed tapers to improve throughput of on-chip astrophotonic spectrographs
Vikram Seenivasan, Pradip Gatkine
Astrophotonics offers a pathway towards compact and stable spectrographs for future large telescopes. The size of these spectrographs does not scale with the diameter of the telesc…
Simulation and development of astrophotonic H-band nulling beam combiner for the CHARA Array
Samantha G. Morrison, Pradip Gatkine, Michael P. Fitzgerald
Nulling interferometry is a promising method for direct detection and characterization of faint stellar companions such as exoplanets and faint binary sources. The dominant constra…
The Photonic Lantern Nuller: from concept to laboratory and on-sky demonstrations
Yinzi Xin, Nemanja Jovanovic, Dimitri Mawet +18
This thesis work presents the conceptual design and experimental characterization of the Photonic Lantern Nuller instrument, which uses a multimode-to-single-mode demultiplexing wa…
Characterization and on-sky testing of photonic, AWG-based astronomical spectrographs
Jeronimo Calderon-Gomez, Frantz Martinache, Nick Cvetojevic +14
Astrophotonics is a field that intends to meet the needs of next-generation instruments at a small footprint, low cost, and high stability, compared to bulk-optics-based alternativ…
Tricouplers for nulling interferometry with photonic integrated circuits
Anusha Pai Asnodkar, Nemanja Jovanovic, Harry-Dean Kenchington Goldsmith +7
Solar System analog gas giants and habitable-zone terrestrial planets are observationally elusive to conventional exoplanet detection and characterization techniques, i.e. transits…
Demonstrating the integration of a photonic lantern with an all-fiber-based nulling interferometer
Jordan Diaz, Rebecca Jensen-Clem, Philip M. Hinz +12
High-contrast imaging of Solar System scale exoplanets and protoplanets demands advancements in instrumentation to access deeper starlight suppression at smaller angular separation…
Tri-coupler geometries for achromatic nulling interferometry in the near-infrared
Harry-Dean Kenchington Goldsmith, Nemanja Jovanovic, Anusha Pai Asnodkar +4
Astrophotonics is central to the next generation of astronomical instrumentation, enabling compact photonic integrated circuits for both ground-based observatories and future space…
Implicit Electric Field Conjugation with the Photonic Lantern Nuller
Yinzi Xin, Daniel Echeverri, Nemanja Jovanovic +12
The Photonic Lantern Nuller (PLN) is an instrument concept designed to characterize exoplanets within a single beam-width from its host star. The PLN leverages the spatial symmetry…
Spectroscopy using a visible photonic lantern at the Subaru telescope: Laboratory characterization and first on-sky demonstration on Ikiiki (α Leo) and `Aua (α Ori)
Sébastien Vievard, Manon Lallement, Sergio Leon-Saval +23
Photonic lanterns are waveguide devices enabling high throughput single mode spectroscopy and high angular resolution. We aim to present the first on-sky demonstration of a photoni…
Visible Photonic Lantern integration, characterization and on-sky testing on Subaru/SCExAO
Sébastien Vievard, Manon Lallement, Sergio Leon-Saval +23
A Photonic Lantern (PL) is a novel device that efficiently converts a multi-mode fiber into several single-mode fibers. When coupled with an extreme adaptive optics (ExAO) system a…
Efficient ultra-broadband low-resolution astrophotonic spectrographs
Pradip Gatkine, Greg Sercel, Nemanja Jovanovic +9
Broadband low-resolution near-infrared spectrographs in a compact form are crucial for ground- and space-based astronomy and other fields of sensing. Astronomical spectroscopy pose…
Thermal control of long delay lines in a high-resolution astrophotonic spectrograph
Gregory P. Sercel, Pradip R. Gatkine, Nemanja Jovanovic +4
High-resolution astronomical spectroscopy carried out with a photonic Fourier transform spectrograph (FTS) requires long asymmetrical optical delay lines that can be dynamically tu…
Laboratory demonstration of a Photonic Lantern Nuller in monochromatic and broadband light
Yinzi Xin, Daniel Echeverri, Nemanja Jovanovic +11
Photonic lantern nulling (PLN) is a method for enabling the detection and characterization of close-in exoplanets by exploiting the symmetries of the ports of a mode-selective phot…
Spectroastrometry and Imaging Science with Photonic Lanterns on Extremely Large Telescopes
Yoo Jung Kim, Michael P. Fitzgerald, Jonathan Lin +11
Photonic lanterns (PLs) are tapered waveguides that gradually transition from a multi-mode fiber geometry to a bundle of single-mode fibers. In astronomical applications, PLs can e…
2023 Astrophotonics Roadmap: pathways to realizing multi-functional integrated astrophotonic instruments
Nemanja Jovanovic, Pradip Gatkine, Narsireddy Anugu +77
Photonics offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular example to date is the ESO Gravity instrument at the Very Large…
The path to detecting extraterrestrial life with astrophotonics
Nemanja Jovanovic, Yinzi Xin, Michael P. Fitzgerald +20
Astrophysical research into exoplanets has delivered thousands of confirmed planets orbiting distant stars. These planets span a wide ranges of size and composition, with diversity…
Photonic spectro-interferometry with SCExAO/FIRST at the Subaru Telescope: towards H-alpha imaging of protoplanets
Sébastien Vievard, Manon Lallement, Elsa Huby +27
FIRST is a post Extreme Adaptive-Optics (ExAO) spectro-interferometer operating in the Visible (600-800 nm, R~400). Its exquisite angular resolution (a sensitivity analysis of on-s…
Flattening laser frequency comb spectra with a high dynamic range, broadband spectral shaper on-a-chip
Nemanja Jovanovic, Pradip Gatkine, Boqiang Shen +9
Spectral shaping is critical to many fields of science. In astronomy for example, the detection of exoplanets via the Doppler effect hinges on the ability to calibrate a high resol…
An all-photonic, dynamic device for flattening the spectrum of a laser frequency comb for precise calibration of radial velocity measurements
Nemanja Jovanovic, Pradip Gatkine, Boqiang Shen +9
Laser frequency combs are fast becoming critical to reaching the highest radial velocity precisions. One shortcoming is the highly variable brightness of the comb lines across the…
Efficient detection and characterization of exoplanets within the diffraction limit: nulling with a mode-selective photonic lantern
Yinzi Xin, Nemanja Jovanovic, Garreth Ruane +9
Coronagraphs allow for faint off-axis exoplanets to be observed, but are limited to angular separations greater than a few beam widths. Accessing closer-in separations would greatl…
In search of short gamma-ray burst optical counterpart with the Zwicky Transient Facility
Tomás Ahumada, Shreya Anand, Michael W. Coughlin +46
The Fermi Gamma-ray Burst Monitor (GBM) triggers on-board in response to 40 short gamma-ray bursts (SGRBs) per year; however, their large localization regions have made the…
Simulating the Study of Exoplanets Using Photonic Spectrographs
Marcos Perez, Pradip Gatkine, Nemanja Jovanovic +3
Photonic spectrographs offer a highly miniaturized, flexible, and stable on-chip solution for astronomical spectroscopy and can be used for various science cases such as determinin…
Development of an integrated near-IR astrophotonic spectrograph
Pradip Gatkine, Meghna Sitaram, Sylvain Veilleux +2
Here, we present an astrophotonic spectrograph in the near-IR H-band (1.45 -1.65 ) and a spectral resolution () of 1500. The main dispersing element of the spectrograph i…
An on-chip astrophotonic spectrograph with a resolving power of 12,000
Pradip Gatkine, Nemanja Jovanovic, Jeffrey Jewell +2
With the upcoming extremely large telescopes (ELTs), the volume, mass, and cost of the associated spectrographs will scale with the telescope diameter. Astrophotonics offers a uniq…