Research

A deeper understanding of interactions between light and matter lives at the heart of
nanophotonics. This knowledge is applied to have control of systems using new materials,
leading to advancements in sensing, communication, and near-term quantum technologies. Our
research group is working many ideas which includes, in-general, development of optical
methods (technologies) for imaging and probing and study of light-matter interaction. The later
includes the development of actively tunable low-loss high-index semiconductor and plasmonic
metasurfaces. We plan to design and develop devices based on photonics technologies such as
advanced on-chip waveguiding, waveguide couplers and ultra-thin flat optical devices like
lenses, beam-splitters, deflector’s holograms etc.

Reconfigurable meta-optics and applications: Subwavelength Mie resonators are the key for
achieving light manipulation with low losses and have shown great promise as enabling
components of meta-optics and nanophotonic technologies. (1,2) Benefiting from a rich optical
response of multipolar magnetic and electric resonances, high-index Mie resonators have enabled
new classes of low-loss transmissive nanophotonic devices and metasurface functionalities such
as metalenses, (3, 4, 5) beam deflectors, (6, 7) holograms, (8, 9) enhanced nonlinear optical
processes, (10, 11) antireflection coatings, (12) to name a few. However, there is high need of
other materials which are required for operation in different spectral ranges (mid-IR, longwave
infrared), (10-15) active functionality, or integration with other material systems. Our research
projects addresses such question by studying the various material systems such as Chalcogenide
materials, phase change materials high-index topological materials etc. These are promising
candidates to fill this gap, owing to their extraordinary properties such as high permittivity, (16,
17) anomalous thermo-optic effects, (16) phase transitions, (18) photo-darkening, and lasing,
which can be harnessed for advanced photonic technologies.

Curved space plasmonics: The non-planar metal-dielectric interface or curvature of the surface
() acts as an effective potential [19], altering the propagation of confined surface waves such as
SPPs, evanescent waves, etc. Such curvature-induced geometric potential will be a new platform
to study the propagation dynamics of the quantum-mechanical particles and optical surface
waves. This modulation is accomplished without any additional external dielectric layer. Using

these concepts, we are working on various projects that include the development of plasmonic
metasurfaces based on high curvature plasmonic optical elements. The devices will developed
using the constant and linearly varying geometric potential to modulate the incoming
electromagnetic fields.

References:
1. All-dielectric metamaterials. Nat. Nanotechnol. 2016, 11, 23– 36.
2. Optically resonant dielectric nanostructures. Science 2016, 354, aag2472.
3. Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution
imaging. Science 2016, 352, 1190– 1194.
4. Multiwavelength achromatic metasurfaces by dispersive phase compensation. Science
2015, 347, 1342– 1345.
5. A broadband achromatic metalens in the visible. Nat. Nanotechnol. 2018, 13, 227– 232.
6. Dielectric gradient metasurface optical elements. Science 2014, 345, 298– 302.
7. A. Planar metasurface retroreflector. Nat. Photonics 2017, 11, 415– 420.
8. Dielectric Meta-Holograms Enabled with Dual Magnetic Resonances in Visible Light. ACS
Nano 2017, 11, 9382– 9389.
9. Meta-Holograms with Full Parameter Control of Wavefront over a 1000 nm Bandwidth. ACS
Photonics 2017, 4, 2158– 2164
10. Resonantly Enhanced Second-Harmonic Generation Using III–V Semiconductor All-Dielectric
Metasurfaces. Nano Lett. 2016, 16, 5426– 5432.
11. Frequency Conversion in a Time-Variant Dielectric Metasurface. Nano Lett. 2020, 20, 7052–
7058
12. A. Broadband omnidirectional antireflection coating based on subwavelength surface Mie
resonators. Nat. Commun. 2012, 3, 692.
13. Unidirectional luminescence from InGaN/GaN quantum-well metasurfaces. Nat. Photonics 2020,
14, 543– 548.
14. Deep-subwavelength resonant meta-optics enabled by ultra-high index Topological Insulators.
Laser & Photonics Reviews, 220081, 2023.
15. Chemical Vapor Deposition of Spherical Amorphous Selenium Mie Resonators for Infrared
Meta-Optics, ACS Applied Materials & Interfaces 14 (3), 4612-4619.
16. Ultrawide Thermo-optic Tuning of PbTe Meta-Atoms. Nano Lett. 2017, 17, 3940– 3945.
17. Ultra-thin high-efficiency mid-infrared transmissive Huygens meta-optics. Nat. Commun. 2018,
9, 1481

Group Member

PhD Students

1. Sivani Semwal

MSc Students

1. Matgrik Marak

2. Prantik Goswami

Lab Facility

Upcoming...

Publications

• 2023

Open Position

If you are fascinated to know about how light interacted with matter then this is your place. Please write to us (danveer.singh@iitrpr.ac.in) further further information. You can visit  Google Scholar for my latest publications.

Postdoctoral Fellow: If you have an external fellowship and wishing to work on the development of metasurfaces using high-index materials systems, specifically in Mid-IR spectrum, then write to us.

PhD Scholars: Those who are interested to work with us, student has to go through the application of PhD program at IIT Ropar (Link). I will be good if we can have online or in-person meeting before you decide to join.

Bachelor/Master's Student: If you are bachelor or master student at IIT Ropar and interested to work with our group then write or meet to me at office#327 (TC).

Teaching

Electronics Lab (PH410), July - December, 2023

Technology Museum Lab (GE101), July - December, 2023

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