4 research outputs found
Supplementary document for Deeply Subwavelength Integrated Excitonic van der Waals Nanophotonics - 6601887.pdf
supplemental informatio
Nonvolatile Phase-Only Transmissive Spatial Light Modulator with Electrical Addressability of Individual Pixels
Active metasurfaces with tunable subwavelength-scale
nanoscatterers
are promising platforms for high-performance spatial light modulators
(SLMs). Among the tuning methods, phase-change materials (PCMs) are
attractive because of their nonvolatile, threshold-driven, and drastic
optical modulation, rendering zero-static power, crosstalk immunity,
and compact pixels. However, current electrically controlled PCM-based
metasurfaces are limited to global amplitude modulation, which is
insufficient for SLMs. Here, an individual-pixel addressable, transmissive
metasurface is experimentally demonstrated using the low-loss PCM
Sb2Se3 and doped silicon nanowire heaters. The
nanowires simultaneously form a diatomic metasurface, supporting a
high-quality-factor (∼406) quasi-bound-state-in-the-continuum
mode. A global phase-only modulation of ∼0.25π (∼0.2π)
in simulation (experiment) is achieved, showing ten times enhancement.
A 2Ï€ phase shift is further obtained using a guided-mode resonance
with enhanced light-Sb2Se3 interaction. Finally,
individual-pixel addressability and SLM functionality are demonstrated
through deterministic multilevel switching (ten levels) and tunable
far-field beam shaping. Our work presents zero-static power transmissive
phase-only SLMs, enabled by electrically controlled low-loss PCMs
and individual meta-molecule addressable metasurfaces
Nonvolatile Phase-Only Transmissive Spatial Light Modulator with Electrical Addressability of Individual Pixels
Active metasurfaces with tunable subwavelength-scale
nanoscatterers
are promising platforms for high-performance spatial light modulators
(SLMs). Among the tuning methods, phase-change materials (PCMs) are
attractive because of their nonvolatile, threshold-driven, and drastic
optical modulation, rendering zero-static power, crosstalk immunity,
and compact pixels. However, current electrically controlled PCM-based
metasurfaces are limited to global amplitude modulation, which is
insufficient for SLMs. Here, an individual-pixel addressable, transmissive
metasurface is experimentally demonstrated using the low-loss PCM
Sb2Se3 and doped silicon nanowire heaters. The
nanowires simultaneously form a diatomic metasurface, supporting a
high-quality-factor (∼406) quasi-bound-state-in-the-continuum
mode. A global phase-only modulation of ∼0.25π (∼0.2π)
in simulation (experiment) is achieved, showing ten times enhancement.
A 2Ï€ phase shift is further obtained using a guided-mode resonance
with enhanced light-Sb2Se3 interaction. Finally,
individual-pixel addressability and SLM functionality are demonstrated
through deterministic multilevel switching (ten levels) and tunable
far-field beam shaping. Our work presents zero-static power transmissive
phase-only SLMs, enabled by electrically controlled low-loss PCMs
and individual meta-molecule addressable metasurfaces
Nonvolatile Phase-Only Transmissive Spatial Light Modulator with Electrical Addressability of Individual Pixels
Active metasurfaces with tunable subwavelength-scale
nanoscatterers
are promising platforms for high-performance spatial light modulators
(SLMs). Among the tuning methods, phase-change materials (PCMs) are
attractive because of their nonvolatile, threshold-driven, and drastic
optical modulation, rendering zero-static power, crosstalk immunity,
and compact pixels. However, current electrically controlled PCM-based
metasurfaces are limited to global amplitude modulation, which is
insufficient for SLMs. Here, an individual-pixel addressable, transmissive
metasurface is experimentally demonstrated using the low-loss PCM
Sb2Se3 and doped silicon nanowire heaters. The
nanowires simultaneously form a diatomic metasurface, supporting a
high-quality-factor (∼406) quasi-bound-state-in-the-continuum
mode. A global phase-only modulation of ∼0.25π (∼0.2π)
in simulation (experiment) is achieved, showing ten times enhancement.
A 2Ï€ phase shift is further obtained using a guided-mode resonance
with enhanced light-Sb2Se3 interaction. Finally,
individual-pixel addressability and SLM functionality are demonstrated
through deterministic multilevel switching (ten levels) and tunable
far-field beam shaping. Our work presents zero-static power transmissive
phase-only SLMs, enabled by electrically controlled low-loss PCMs
and individual meta-molecule addressable metasurfaces