Powering the next generation of AI chips, optical computers, and quantum devices
Excitonics is the field of science that studies and engineers excitons — particles formed when a photon of light enters a material and creates a bound pair of an electron and a positive "hole." Instead of pushing electrons through copper wire, excitonic devices move information using these light-born particles, enabling computing that is faster, smaller, and dramatically more energy-efficient than anything electronics can achieve today.
The weekly newsletter on excitonics and photonics — plain-English intelligence for investors, engineers, and the curious. Catch the wave before it breaks.
A plain-English guide to the particle that could make today's AI chips look like vacuum tubes.
A photon of light enters a semiconductor material. Inside, it collides with an electron and knocks it loose — but the electron stays magnetically bound to the positive "hole" it left behind. This bound pair is an exciton. It travels through the material carrying the photon's energy, does useful work, then collapses back into a photon of light. Light goes in. Light comes out. Inside, it becomes matter — briefly.
Electrons are slow, hot, and lossy. When you push electrons through copper at high speed, most energy becomes heat — why your phone gets warm and data centers need buildings of cooling. Excitons move at the speed of light, generate almost no heat, and carry far more information in parallel. Every fundamental limit of electronics is an advantage for excitonics.
Excitons were considered too fragile for practical circuits — only generated at temperatures near absolute zero (−173°C). The breakthrough: researchers at EPFL used two 2D materials — tungsten diselenide and molybdenum disulfide — to control exciton lifespan at room temperature. The AI era's demand for faster, cooler computing did the rest.
All three represent post-electronic computing. Photonics uses light through optical fiber. Spintronics uses electron spin. Excitonics is the bridge — converting light into matter-like particles that can be manipulated like electrons but move like photons. Most researchers call it "the most promising of the three for logic circuits."
| Property | Electronics | Photonics | Excitonics |
|---|---|---|---|
| Information carrier | Electrons | Photons (light) | Excitons (light + matter) |
| Speed | GHz range | Speed of light | Near speed of light |
| Heat generation | High (bottleneck) | Very low | Near zero |
| Logic circuits | Mature, everywhere | Limited, difficult | Emerging, very promising |
| Energy efficiency | Baseline | 10–100× better | 100–1000× potential |
| Miniaturization limit | Near wall (2nm) | Wavelength-limited | 2D material limit — far smaller |
| Room temp operation | Yes | Yes | Yes (2024 breakthrough) |
| Commercial maturity | Fully mature | Early commercial | Research → early commercial |
| Key companies | Intel, TSMC, Samsung | Lumentum, Coherent, Ciena | POET, Lumentum, Aeluma |
The companies building the physical layer of AI infrastructure. 2026 has been their breakout year.
From solar cells to quantum computers — the fields being transformed by light-matter particles.
As GPU clusters scale into hundreds of thousands of chips, copper interconnects become the bottleneck. Excitonic and photonic interconnects replace copper with light. NVIDIA's $6.5B photonics investment in 2026 is aimed directly at this problem.
Active · CommercialExcitons are naturally generated when sunlight hits photovoltaic materials. Excitonic solar cells — using organic and perovskite materials — promise conversion efficiencies far beyond silicon's theoretical limit.
Active · CommercialOLEDs and quantum dot displays already exploit excitonic principles. The next generation using 2D excitonic materials promises near-perfect color purity and displays only a few atoms thick.
Active · CommercialThe ultimate prize: a computer that processes information entirely in light. Research teams at MIT, EPFL, and Stanford are racing to demonstrate excitonic logic circuits that could replace silicon transistors for AI workloads.
Research → EarlyExcitons in 2D materials are natural qubits that maintain quantum coherence at practical temperatures. Candidates for quantum networking nodes linking quantum computers across cities.
Early ResearchExcitonic materials can be engineered to respond with extreme sensitivity to specific molecules. Lab-on-a-chip devices promise point-of-care diagnostics that rival full laboratory analysis.
Research → Early"Catch the wave before it breaks."
The weekly intelligence briefing on excitonics and photonics — the science and markets most investors haven't found yet.
Lab breakthroughs, research papers, and signals building beneath the surface — the science that hasn't hit mainstream news yet. This is where waves are born.
Stock moves, funding announcements, company news, and earnings that are landing right now. The wave is breaking — here's where it's hitting shore.
The hidden current that can pull you under. Risks, red flags, overvalued stocks, regulatory threats, and the contrarian view that most newsletters won't publish. The Rip could save your portfolio.
The actionable takeaway. Where to stand, what to watch, what smart money is doing. Every issue ends with one clear thing you can do with this week's intelligence.
Researchers at the University of Pennsylvania demonstrated all-light switching using exciton-polaritons at just 4 quadrillionths of a joule. That number doesn't sound dramatic until you realize it's the energy equivalent of briefly powering a single atom of LED. This is the science that makes excitonic computing not just possible but inevitable — and it's three years from commercial application at most.
AAOI up 329% YTD. AEHR up 477%. Lumentum trading at $858 after starting 2026 at $78. The photonics wave has broken — loudly. But the deeper story is in POET Technologies, which sits at the precise intersection of photonics and excitonics and hasn't yet had its breakout moment.
The rally in photonics stocks has been real — but vertical moves of 300–400% in six months always attract momentum traders who have no idea what an exciton is. When the next broad market selloff hits, these names will correct hard and fast. Position sizing matters more right now than stock picking.
Watch POET's next earnings. Watch for any academic paper from MIT's photonics group. And if you're not yet tracking the .ai domain market, know that "excitonic" as a search term has zero competition and rising volume — the digital real estate equivalent of 1995 domain registration is happening right now in this exact niche.
Weekly intelligence on the science and stocks most investors haven't found yet. Free to start. No spam. Cancel anytime.
✦ Live at wave.excitonic.comYou'll be taken to wave.excitonic.com to complete your subscription.
From a theoretical curiosity in the 1930s to a room-temperature switch built in an Ann Arbor lab and a stock rally nobody saw coming — the story of the exciton is one of physics' most patient revolutions, finally paying off.